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Versions: 00 01 02 03 04 05 06 07 08 09 10 11 RFC 4639

Internet Draft                                      R. Woundy (editor)
IPCDN Working Group                                     AT&T Broadband
draft-ietf-ipcdn-device-mibv2-03.txt                     November 2002


                Cable Device Management Information Base
                 for DOCSIS compliant Cable Modems and
                    Cable Modem Termination Systems

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

Copyright Notice

   Copyright (C) The Internet Society (2002). All Rights Reserved.

Abstract

   This memo is a draft revision of the standards track RFC-2669.
   Please see "Revision Descriptions" below for a description of
   changes.  This document or its successor will obsolete RFC-2669 when
   accepted.

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, it defines a basic set of managed objects for SNMP-
   based management of DOCSIS compliant Cable Modems and Cable Modem
   Termination Systems.

   This memo specifies a MIB module in a manner that is compliant to the



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   SNMP SMIv2[5][6][7].  The set of objects is consistent with the SNMP
   framework and existing SNMP standards.

   This memo is a product of the IPCDN working group within the Internet
   Engineering Task Force.  Comments are solicited and should be
   addressed to the working group's mailing list at ipcdn@ietf.org
   and/or the author.

Table of Contents

   1 The SNMP Management Framework ................................    2
   2 Glossary .....................................................    3
   2.1 CATV .......................................................    4
   2.2 CM .........................................................    4
   2.3 CMTS .......................................................    4
   2.4 DOCSIS .....................................................    4
   2.5 Downstream .................................................    4
   2.6 Head-end ...................................................    4
   2.7 MAC Packet .................................................    4
   2.8 RF .........................................................    4
   2.9 Upstream ...................................................    4
   3 Overview .....................................................    5
   3.1 Structure of the MIB .......................................    5
   3.2 Management requirements ....................................    6
   3.2.1 Handling of Software upgrades ............................    6
   3.2.2 Events and Notifications .................................    6
   3.2.3 Notification Throttling ..................................    7
   3.2.3.1 Notification rate throttling ...........................    7
   3.2.3.2 Limiting the notification rate .........................    7
   3.3 Protocol Filters ...........................................    8
   3.3.1 Inbound LLC Filters - docsDevFilterLLCTable ..............    9
   3.3.2 Special Filters ..........................................    9
   3.3.2.1 IP Spoofing Filters - docsDevCpeTable ..................    9
   3.3.2.2 SNMP Access Filters - docsDevNmAccessTable .............    9
   3.3.3 IP Filtering - docsDevFilterIpTable ......................   10
   3.3.4 Outbound LLC Filters .....................................   12
   4 Definitions ..................................................   12
   5 Acknowledgments ..............................................   68
   6 Revision Descriptions ........................................   68
   7 References ...................................................   69
   8 Security Considerations ......................................   71
   9 Intellectual Property ........................................   73
   10 Editor's Address ............................................   73
   11 Copyright Section ...........................................   74

1.  The SNMP Management Framework

   The SNMP Management Framework presently consists of five major



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   components:

   o   An overall architecture, described in RFC 2571 [1].

   o   Mechanisms for describing and naming objects and events for the
       purpose of management. The first version of this Structure of
       Management Information (SMI) is called SMIv1 and described in STD
       16, RFC 1155 [2], STD 16, RFC 1212 [3] and RFC 1215 [4].  The
       second version, called SMIv2, is described in STD 58, RFC 2578
       [5], STD 58, RFC 2579 [6] and STD 58, RFC 2580 [7].

   o   Message protocols for transferring management information. The
       first version of the SNMP message protocol is called SNMPv1 and
       described in STD 15, RFC 1157 [8]. A second version of the SNMP
       message protocol, which is not an Internet standards track
       protocol, is called SNMPv2c and described in RFC 1901 [9] and RFC
       1906 [10].  The third version of the message protocol is called
       SNMPv3 and described in RFC 1906 [10], RFC 2572 [11] and RFC 2574
       [12].

   o   Protocol operations for accessing management information. The
       first set of protocol operations and associated PDU formats is
       described in STD 15, RFC 1157 [8]. A second set of protocol
       operations and associated PDU formats is described in RFC 1905
       [13].

   o   A set of fundamental applications described in RFC 2573 [14] and
       the view-based access control mechanism described in RFC 2575
       [15].

   A more detailed introduction to the current SNMP Management Framework
   can be found in RFC 2570 [23].

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  Objects in the MIB are
   defined using the mechanisms defined in the SMI.

   This memo specifies a MIB module that is compliant to the SMIv2. A
   MIB conforming to the SMIv1 can be produced through the appropriate
   translations. The resulting translated MIB must be semantically
   equivalent, except where objects or events are omitted because no
   translation is possible (use of Counter64). Some machine readable
   information in SMIv2 will be converted into textual descriptions in
   SMIv1 during the translation process. However, this loss of machine
   readable information is not considered to change the semantics of the
   MIB.

2.  Glossary



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   The terms in this document are derived either from normal cable
   system usage, or from the documents associated with the Data Over
   Cable Service Interface Specification process.

2.1.  CATV

   Originally "Community Antenna Television", now used to refer to any
   cable or hybrid fiber and cable system used to deliver video signals
   to a community.

2.2.  CM   Cable Modem.

   A CM acts as a "slave" station in a DOCSIS compliant cable data
   system.

2.3.  CMTS   Cable Modem Termination System.

   A generic term covering a cable bridge or cable router in a head-end.
   A CMTS acts as the master station in a DOCSIS compliant cable data
   system.  It is the only station that transmits downstream, and it
   controls the scheduling of upstream transmissions by its associated
   CMs.

2.4.  DOCSIS

   "Data Over Cable Interface Specification".  A term referring to the
   ITU-T J.112 Annex B standard for cable modem systems. [20]

2.5.  Downstream

   The direction from the head-end towards the subscriber.

2.6.  Head-end

   The origination point in most cable systems of the subscriber video
   signals. Generally also the location of the CMTS equipment.

2.7.  MAC Packet

   A DOCSIS PDU.

2.8.  RF

   Radio Frequency.

2.9.  Upstream

   The direction from the subscriber towards the head-end.



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3.  Overview

   This MIB provides a set of objects required for the management of
   DOCSIS compliant Cable Modems (CM) and Cable Modem Termination
   Systems (CMTS).  The specification is derived from the DOCSIS Radio
   Frequency Interface specification [16].  Please note that the DOCSIS
   1.0 standard only requires Cable Modems to implement SNMPv1 and to
   process IPv4 customer traffic. Design choices in this MIB reflect
   those requirements.  DOCSIS 1.1 requires support for SNMPv3 and the
   changes in this MIB over the previous proposed standard version
   reflect those additional requirements.  Future versions of DOCSIS are
   are expected to require support for IPv6 as both a CPE protocol and
   one supported by the network elements of the DOCSIS CMTS/CM system.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [19].

3.1.  Structure of the MIB

   This MIB is structured into seven groups:

   o    The docsDevBase group extends the MIB-II 'system' group with
        objects needed for cable device system management.

   o    The docsDevNmAccessGroup provides a minimum level of SNMP
        access security (see Section 3 of [18]).

   o    The docsDevSoftware group provides information for network-
        downloadable software upgrades.  See "Handling of Software
        Upgrades" below.

   o    The docsDevServer group provides information about the progress
        of the interaction between the CM or CMTS and various
        provisioning servers.

   o    The docsDevEvent group provides control and logging for event
        reporting.

   o    The docsDevFilter group configures filters at link layer and IP
        layer for bridged data traffic.  This group consists of a link-
        layer filter table, docsDevFilterLLCTable, which is used to
        manage the processing and forwarding of non-IP traffic; an IP
        packet classifier table, docsDevFilterIpTable, which is used to
        map classes of packets to specific policy actions; a policy
        table, docsDevFilterPolicyTable, which maps zero or more policy
        actions onto a specific packet classification, and one or more
        policy action tables.



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        At this time, this MIB specifies only one policy action table,
        docsDevFilterTosTable, which allows the manipulation of the type
        of services bits in an IP packet based on matching some
        criteria.  The working group may add additional policy types and
        action tables in the future, for example to allow QOS to modem
        service identifier assignment based on destination [27].

   o    The docsDevCpe group provides control over which IP addresses
        may be used by customer premises equipment (e.g. PCs) serviced
        by a given cable modem.  This provides anti-spoofing control at
        the point of origin for a large cable modem system.  This group
        is separate from docsDevFilter primarily as this group is only
        implemented on the Cable Modem (CM) and MUST NOT be implemented
        on the Cable Modem Termination System (CMTS).

3.2.  Management requirements

3.2.1.  Handling of Software upgrades

   The Cable Modem software upgrade process is documented in [16].  From
   a network management station, the operator:

   o    sets docsDevSwServer to the address of the TFTP server for
        software upgrades

   o    sets docsDevSwFilename to the file pathname of the software
        upgrade image

   o    sets docsDevSwAdminStatus to upgrade-from-mgt

   One reason for the SNMP-initiated upgrade is to allow loading of a
   temporary software image (e.g., special diagnostic software) that
   differs from the software normally used on that device without
   changing the provisioning database.

   Note that software upgrades should not be accepted blindly by the
   cable device. The cable device may refuse an upgrade if:

   o    The download is incomplete.

   o    The file contents are incomplete or damaged.

   o    The software is not intended for that hardware device (may
        include the case of a feature set that has not been purchased
        for this device).

3.2.2.  Events and Notifications




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   This MIB provides control facilities for reporting events through
   syslog, notifications (traps and informs), and non-volatile logging.

   The conventions for event reporting are outside the scope of this
   document.  The definition and coding of common DOCSIS notifications
   can be found in [24].

3.2.3.  Notification Throttling

   The CM and CMTS MUST provide support for notification message
   throttling as described below.  The network operator can employ
   notification rate throttling or notification limiting by manipulating
   the appropriate MIB variables.

3.2.3.1.  Notification rate throttling

   Network operators may employ either of two rate control methods.  In
   the first method, the device ceases to send notifications when the
   rate exceeds the specified maximum message rate.  It resumes sending
   notifications only if reactivated by a network management station
   request.

   In the second method, the device resumes sending notifications when
   the rate falls below the specified maximum message rate.

   The network operator configures the specified maximum message rate by
   setting the measurement interval (in seconds), and the maximum number
   of notifications to be transmitted within the measurement interval.
   The operator can query the operational throttling state (to determine
   whether notifications are enabled or blocked by throttling) of the
   device, as well as query and set the administrative throttling state
   (to manage the rate control method) of the device.

3.2.3.2.  Limiting the notification rate

   Network operators may wish to limit the number of notifications sent
   by a device over a specified time period.  The device ceases to send
   notifications when the number of notifications exceeds the specified
   threshold.  It resumes sending notifications only when the
   measurement interval has passed.

   The network operator defines the maximum number of notifications he
   is willing to handle and sets the measurement interval to a large
   number (in hundredths of a second).  For this case, the
   administrative throttling state is set to stop at threshold which is
   the maximum number of notifications.

   See "Techniques for Managing Asynchronously Generated Alerts" [17]



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   for further information.

3.3.  Protocol Filters

   The Cable Device MIB provides objects for both LLC and IP protocol
   filters.  The LLC protocol filter entries can be used to limit CM
   forwarding to a restricted set of network-layer protocols (such as
   IP, IPX, NetBIOS, and Appletalk).

   The IP protocol filter entries can be used to restrict upstream or
   downstream traffic based on source and destination IP addresses,
   transport-layer protocols (such as TCP, UDP, and ICMP), and source
   and destination TCP/UDP port numbers.

   In general, a cable modem applies filters (or more properly,
   classifiers) in an order appropriate to the layering model.
   Specifically, the inbound MAC (or LLC) layer filters are applied
   first, then the "special" filters, then the IP layer inbound filters,
   then the IP layer outbound filters, then any final LLC outbound
   filters.

                *****************
                * LLC Filter In *
                *****************
                        |
                        v
               *******************
               * Special Filters *
               *        |        *
               *        V        *
               *  ************   *
               *  * IP Spoof *   *
               *  ************   *
               *        |        *
               *        v        *
               * *************** *
               * * SNMP Access * *
               * *************** *
               *        |        *
               *******************
                        |
                        v
                ****************
                * IP Filter In *
                ****************
                        |
                        v
                *****************



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                * IP Filter Out *
                *****************
                        |
                        v
                ******************
                * LLC Filter Out *
                ******************

3.3.1.  Inbound LLC Filters - docsDevFilterLLCTable

   The inbound LLC (or MAC or level-2) filters are contained in the
   docsDevFilterLLCTable and are applied to level-2 frames entering the
   cable modem from either the RF MAC interface or from one of the CPE
   (ethernet or other) interfaces.  These filters are used to prohibit
   the processing and forwarding of certain types of level-2 traffic
   that may be disruptive to the network.  The filters, as currently
   specified, can be set to cause the modem to either drop frames which
   match at least one filter, or to process a frame which matches at
   least one filter.  Some examples of possible configurations would be
   to only permit IP (and ARP) traffic, or to drop NetBIOS traffic.

3.3.2.  Special Filters

   Special filters are applied after the packet is accepted from the MAC
   layer by the IP module, but before any other processing is done.
   They are filters that apply only to a very specific class of traffic.

3.3.2.1.  IP Spoofing Filters - docsDevCpeTable

   IP spoofing filters are applied to packets entering the modem from
   one of the CPE interfaces and are intended to prevent a subscriber
   from stealing or mis-using IP addresses that were not assigned to the
   subscriber.  If the filters are active (enabled), the source address
   of the IP packet must match at least one IP address in this table or
   it is discarded without further processing.

   The table can be automatically populated where the first N different
   IP addresses seen from the CPE side of the cable modem are used to
   automatically populate the table.  The spoofing filters are specified
   in the docsDevCpeTable and the policy for automatically creating
   filters in that table is controlled by docsDevCpeEnroll and
   docsDevCpeMax as well as the network management agent.

   Similar IP spoofing filter controls are defined for CMTS
   implementation in the Subscriber Management MIB [25].

3.3.2.2.  SNMP Access Filters - docsDevNmAccessTable




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   The SNMP access filters are applied to SNMP packets entering from any
   interface and destined for the cable modem.  If the packets enter
   from a CPE interface, the SNMP filters are applied after the IP
   spoofing filters.  The filters only apply to SNMPv1 or SNMPv2c
   traffic, and are not consulted for SNMPv3 traffic (and need not be
   implemented by a v3 only agent).  SNMPv3 access control is specified
   in the User Security Model MIB in [12].

   With the completion of the SNMP coexistence document, RFC 2576 [21],
   docsDevNmAccess table has been deprecated in this version of the MIB.
   See the body of the MIB for the description of how agents should
   handle the interaction between RFC 2576 MIBs and this MIB.

   docsDevNmAccessTable specified a mechanism for limiting SNMP access
   based on interface.  That capability has been retained as a set of
   augmenting objects to the vacmAccessTable of the view-based access
   control MIB, RFC 2575 [22].  Please see the description for
   docsDevVacmAccessExtTable in the body of the MIB below. Basically,
   SNMP packets are tagged with the interface through which they are
   received by the agent.  If that interface is not included in the set
   of interfaces referenced by this table for a particular view, then
   that view is not visible for that SNMP request.

3.3.3.  IP Filtering - docsDevFilterIpTable

   The IP Filtering table acts as a classifier table.  Each row in the
   table describes a template against which IP packets are compared.
   The template includes source and destination addresses (and their
   associated masks), upper level protocol (e.g. TCP, UDP), source and
   destination port ranges, TOS and TOS mask. A row also contains
   interface and traffic direction match values which have to be
   considered in combination.  All columns of a particular row must
   match the appropriate fields in the packet, and must match the
   interface and direction items for the packet to result in a match to
   the packet.

   When classifying a packet, the table is scanned beginning with the
   lowest number filter.  If the agent finds a match, it applies the
   group of policies specified.  If the matched filter has the continue
   bit set, the agent continues the scan possibly matching additional
   filters and applying additional policies.  This allows the agent to
   take one set of actions for the 24.0.16/255.255.255.0 group and one
   set of actions for telnet packets to/from 24.0.16.30 and these sets
   of actions may not be mutually exclusive.

   Once a packet is matched, one of three actions happen based on the
   setting of docsDevFilterIpControl in the row.  The packet may be
   dropped, in which case no further processing is required.  The packet



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   may be accepted and processing of the packet continues.  Lastly, the
   packet may have a set of policy actions applied to it.  If
   docsDevFilterIpContinue is set to true, scanning of the table
   continues and additional matches may result.

   When a packet matches, and docsDevFilterIpControl in the filter
   matched is set to 'policy', the value of docsDevFilterIpPolicyId is
   used as a selector into the docsDevFilterPolicyTable.  The first
   level of indirection may result in zero or more actions being taken
   based on the match.  The docsDevFilterPolicyTable is scanned in row
   order and all rows where docsDevFilterPolicyId equals
   docsDevFilterIpPolicyId have the action specified by
   docsDevFilterPolicyValue 'executed'.  For example, a value pointing
   to an entry in the docsDevFilterTosTable may result in the re-writing
   of the TOS bits in the IP packet which was matched.  Another
   possibility may be to assign an output packet to a specific output
   upstream queue.  An even more complex action might be to re-write the
   TOS value, assign the packet to an upstream service ID, and drop it
   into a particular IPSEC tunnel.

   Example:

   docsDevFilterIpTable

   ##  Index,  SrcIP/Mask, DstIP/Mask,ULP, SrcPts,DstPts,Tos/Mask,
   # Int/Dir,  Pgroup, [continue]
   # drop any netbios traffic
   10, 0/0, 0/0, TCP, any, 137-139, 0/0, any/any, drop

   # traffic to the proxy gets better service - other matches possible
   20, 0/0, proxy/32, TCP, any,any, 0/0, cpe/in, 10, continue

   # Traffic from CPE 1 gets 'Gold' service, other matches possible
   30, cpe1/32, 0/0, any, any,any, 0/0, cpe/in, 20, continue

   # Traffic from CPE2 to work goes, other traffic dropped
   40, cpe2/32, workIPs/24, any, 0/0, cpe/in, accept
   45, cpe2/32, 0/0, any, any,ayn, 0/0, cpe/in, drop

   # Traffic with TOS=4 gets queued on the "silver" queue.
   50, 0/0, 0/0, any, any,any, 4/255, cpe/in, 30

   # Inbound "server" traffic to low numbered ports gets dropped.
   60, 0/0, 0/0, TCP, any,1-1023, 0/0, cpe/out, drop
   65, 0/0, 0/0, UDP, any,1-1023, 0/0, cpe/out, drop

   docsDevFilterPolicyTable




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   #
   # index, policy group, policy
   10, 10, queueEntry.20   -- special queue for traffic to proxy

   15, 20, queueEntry.15   -- Gold Service queue
   20, 20, docsDevFilterTosStatus.10 -- Mark this packet with TOS 5

   25, 30, queueEntry.10   -- Silver service queue

   This table describes some special processing for packets originating
   from either the first or second CPE device which results in their
   queuing on to special upstream traffic queues and for the "gold"
   service results in having the packets marked with a TOS of 5.  The
   10, 20, 60 and 65 entries are generic entries that would generally be
   applied to all traffic to this CM.  The 30, 40 and 45 entries are
   specific to a particular CPE's service assignments.  The ordering
   here is a bit contrived, but is close to what may actually be
   required by the operator to control various classes of customers.

   Similar IP classifier controls are defined for CMTS implementation in
   the Subscriber Management MIB [25].

3.3.4.  Outbound LLC Filters

   Lastly, any outbound LLC filters are applied to the packet just prior
   to it being emitted on the appropriate interface.  This MIB does not
   specify any outbound LLC filters, but it is anticipated that the QOS
   additions to the DOCSIS standard may include some outbound LLC
   filtering requirements.  If so, those filters would be applied as
   described here.

   [Editor's note: this doesn't seem to be the case, according to
   draft-ietf-ipcdn-qos-mib-04.txt.]


4.  Definitions

   DOCS-CABLE-DEVICE-MIB DEFINITIONS ::= BEGIN

   IMPORTS
           MODULE-IDENTITY,
           OBJECT-TYPE,
           IpAddress,
           Unsigned32,
           Counter32,
           Integer32,
           zeroDotZero,
           mib-2



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                   FROM SNMPv2-SMI
           TEXTUAL-CONVENTION,
           RowStatus,
           RowPointer,
           DateAndTime,
           TruthValue
                   FROM SNMPv2-TC
           InetAddressType,
           InetAddress,
           InetAddressIPv6
                   FROM INET-ADDRESS-MIB
           OBJECT-GROUP,
           MODULE-COMPLIANCE
                   FROM SNMPv2-CONF
           SnmpAdminString
                   FROM SNMP-FRAMEWORK-MIB
           vacmAccessEntry
                   FROM SNMP-VIEW-BASED-ACM-MIB
           InterfaceIndexOrZero
                   FROM IF-MIB;

   docsDev MODULE-IDENTITY
           LAST-UPDATED    "200211030000Z"  -- 3 November 2002
           ORGANIZATION    "IETF IPCDN Working Group"
           CONTACT-INFO
               "        Rich Woundy
                Postal: AT&T Broadband
                        27 Industrial Avenue
                        Chelmsford, MA 01824 U.S.A.
                Phone:  +1 978 244 4010
                E-mail: rwoundy@broadband.att.com

                IETF IPCDN Working Group
                General Discussion: ipcdn@ietf.org
                Subscribe: http://www.ietf.org/mailman/listinfo/ipcdn
                Archive: ftp://ftp.ietf.org/ietf-mail-archive/ipcdn
                Co-chairs: Richard Woundy, rwoundy@broadband.att.com
                           Jean-Francois Mule, jf.mule@cablelabs.com"
           DESCRIPTION
               "This is the MIB Module for DOCSIS compliant cable modems
                and cable-modem termination systems."
           REVISION "200211030000Z"  -- 3 November 2002
           DESCRIPTION
               "Modified by Rich Woundy to enable TFTP and HTTP software
                downloads through the addition of new objects, to define
                a new docsDevMaxCpe object, to simplify the operation of
                docsDevEvThrottleInhibited, to remove direct references
                to RFCs 2233 and 2851, to fix errors caught by MIB



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                compilers, and to correct miscellaneous DESCRIPTION
                errors."
           REVISION "200207010000Z"  -- 1 July 2002
           DESCRIPTION
               "Modified by Rich Woundy to add
                docsDevNmAccessTrapVersion, use 0.0.0.0 to represent
                any NMS for docsDevNmAccessIp, and fixed references
                to docsDevIpFilterTable (should be docsDevFilterIpTable)
                and docsDevFilterIpPolicyTable (should be
                docsDevFilterPolicyTable). This MIB was NOT checked
                by a MIB compiler."
           REVISION "200103020000Z"  -- 2 March 2001
           DESCRIPTION
               "Modified by Rich Woundy to use RFC 2851 for IPv6
                compliance. Added back two obsoleted objects to ensure
                OIDs are never re-used. Added the docsDevIgmpModeControl
                object for IGMP mode control."
           REVISION "200007070000Z"  -- 7 July  2000, 0000Z
           DESCRIPTION
               "Modified by Mike StJohns to bring into SNMPv3/IPv6
                compliance. Modified to deal with multiple CPE
                interface devices.  Updated compliance statements to
                current version."
           REVISION "9908190000Z"
           DESCRIPTION
               "Initial version, published as RFC 2669."
           ::= { mib-2 69 }


   docsDevMIBObjects  OBJECT IDENTIFIER ::= { docsDev 1 }
   docsDevBase OBJECT IDENTIFIER ::= { docsDevMIBObjects 1 }

   -- Textual Conventions

   InterfaceSet ::= TEXTUAL-CONVENTION
           STATUS  current
           DESCRIPTION
               "This is a convenience syntax for setting the value of a
                bit set object which depicts a set of interfaces.  Upon
                read an object of this type always returns other (1).  Upon
                a valid set, this causes the related interface bit set
                object (as indicated in the object description which uses
                this syntax) in the same row to be set to a bit set
                consisting of the interfaces (and ONLY the interfaces)
                which match the class type represented by this object.

                allCpe - all interfaces which face the customer.
                allNetwork - all interfaces which do not face the customer



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                  - e.g. for a CM the HFC MAC interface.
                allCpeEthernet, allCpeUsb, allCpeFirewire - all interfaces
                  which face the customer of a particular type.
                allExternal - all interfaces which have a external physical
                  instantiation, e.g. CPE Ethernet, HFC MAC, PCI Bus
                allInternal - all interfaces which point towards either the
                  devices own stack, or towards an application residing on
                  the device
                self - the interface which points to the device's own stack
                all - all interfaces.
                application1-4 - a specific application residing on the CM
                  or CMTS.

                The specific mapping of which values of this object map to
                which interfaces is out of scope for this document (and in
                general is set by the vendor).

                Certain of these classes of interfaces may not exist on
                specific agents.  In which case, setting this object to
                those values results in related interface bit set being set
                to an empty bit set. all, allCpe and allNetwork MUST be
                valid settings for this object on any compliant agent and
                MUST result in at least one interface bit being set in
                the related bit set.

                If both the object with this syntax and its related object
                are SET in the same action the result is undefined as the
                order in which the SETs take place is undefined.  Either
                one or the other object should be SET at any given time,
                not both."
           SYNTAX  INTEGER {
               other (1),
               allCpe (2),
               allNetwork (3),
               allCpeEthernet (4),
               allCpeUsb (5),
               allCpeFirewire (6),
               allExternal (7),
               allInternal (8),
               all (9),
               application1 (10),
               application2 (11),
               application3 (12),
               application4 (13)
               }

   --
   -- For the following object, there is no concept in the



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   -- RFI specification corresponding to a backup CMTS. The
   -- enumeration is provided here in case someone is able
   -- to define such a role or device.
   --

   docsDevRole OBJECT-TYPE
           SYNTAX INTEGER {
               cm(1),
               cmtsActive(2),
               cmtsBackup(3)
           }
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "Defines the current role of this device.  cm (1) is
                a Cable Modem, cmtsActive(2) is a Cable Modem Termination
                System which is controlling the system of cable modems,
                and cmtsBackup(3) is a CMTS which is currently connected,
                but not controlling the system (not currently used).

                In general, if this device is a 'cm', its role will not
                change during operation or between reboots.  If the
                device is a 'cmts' it may change between cmtsActive and
                cmtsBackup and back again during normal operation.  NB:
                At this time, the DOCSIS standards do not support the
                concept of a backup CMTS, cmtsBackup is included for
                completeness."
           ::= { docsDevBase 1 }

   docsDevDateTime OBJECT-TYPE
           SYNTAX      DateAndTime
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "The current date and time, with optional timezone
                information.  This is set at boot from the time server.  If
                it's impossible to set this from boot, this shall represent
                elapsed time from boot relative to the standard epoch (e.g.
                1 Jan 1970 0000Z).  In other words, if this agent has been
                up for 3 minutes, and has been unable to set this object
                from the time server, this object will return 1 Jan 1970
                0003Z."
           ::= { docsDevBase 2 }

   docsDevResetNow OBJECT-TYPE
           SYNTAX      TruthValue
           MAX-ACCESS  read-write
           STATUS      current



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           DESCRIPTION
               "Setting this object to true(1) causes the device to reset.
                Reading this object always returns false(2)."
           ::= { docsDevBase 3 }

   docsDevSerialNumber OBJECT-TYPE
           SYNTAX      SnmpAdminString
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The manufacturer's serial number for this device."
           ::= { docsDevBase 4 }

   docsDevSTPControl OBJECT-TYPE
           SYNTAX INTEGER {
               stEnabled(1),
               noStFilterBpdu(2),
               noStPassBpdu(3)
           }
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "This object controls operation of the spanning tree
                protocol (as distinguished from transparent bridging).
                If set to stEnabled(1) then the spanning tree protocol
                is enabled, subject to bridging constraints. If
                noStFilterBpdu(2), then spanning tree is not active,
                and Bridge PDUs received are discarded.
                If noStPassBpdu(3) then spanning tree is not active
                and Bridge PDUs are transparently forwarded. Note that
                a device need not implement all of these options,
                but that noStFilterBpdu(2) is required."
           ::= { docsDevBase 5 }

   docsDevIgmpModeControl OBJECT-TYPE
           SYNTAX INTEGER {
               passive(1),
               active(2)
           }
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "This object controls the mode of operation that
                the CM/CMTS will operate in. In passive mode,
                the device forwards IGMP between interfaces
                based on knowledge of Multicast Session activity
                on the subscriber side interface and the rules
                defined in section 3.3.1 of the RFI. In active



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                mode, the device terminates at and intiates IGMP
                through its interfaces based on the knowledge of
                Multicast Session activity on the subscriber
                side interface."
           ::= { docsDevBase 6 }

   docsDevMaxCpe OBJECT-TYPE
           SYNTAX      Integer32 (0..255)
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The maximum number of CPEs that can be granted access
                through a CM during a CM epoch. This value is obtained
                from the CM configuration file and is defined in [16]."
           ::= { docsDevBase 7 }

   --
   -- The following table provides one level of security for access
   -- to the device by network management stations.
   -- Note that access is also constrained by the
   -- community strings and any vendor-specific security.
   --

   docsDevNmAccessTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF DocsDevNmAccessEntry
           MAX-ACCESS  not-accessible
           STATUS      deprecated
           DESCRIPTION
               "This table controls access to SNMP objects by network
                management stations. If the table is empty, access to SNMP
                objects is unrestricted.  This table exists only on SNMPv1
                or v2c agents and does not exist on SNMPv3 agents. See the
                conformance section for details.  Specifically, for v3
                agents, the appropriate MIBs and security models apply in
                lieu of this table.

                This table is deprecated.  Instead, use the SNMP
                coexistence MIBs from RFC2576, the TARGET and NOTIFICATION
                MIBs from the SNMP Applications RFC, and the VACM MIBs for
                SNMPv1 and V2C access.

                If SNMP-COMMUNITY-MIB is implemented AND snmpCommunityTable
                is populated, then docsDevNmAccessTable and its entries are
                ignored for the purpose of determining v1 or v2c access.
                If the SNMP-COMMUNITY-MIB table has no entries, then this
                table has its normal access control (described above)
                meaning for v1 and v2c access.  Obviously, if
                docsDevNmAccessTable is not implemented and



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                snmpCommunityTable is not populated, then there will be no
                access via SNMPv1 or v2c.

                To be very specific:

                IF the count of rows in
                     SNMP-COMMUNITY-MIB|snmpCommunityTable > 0
                THEN resolve access using snmpCommunityTable
                ELSE resolve access using docsDevNmAccessTable"
           ::= { docsDevMIBObjects 2 }

   docsDevNmAccessEntry OBJECT-TYPE
           SYNTAX      DocsDevNmAccessEntry
           MAX-ACCESS  not-accessible
           STATUS      deprecated
           DESCRIPTION
               "An entry describing access to SNMP objects by a
                particular network management station. An entry in
                this table is not readable unless the management station
                has read-write permission (either implicit if the table
                is empty, or explicit through an entry in this table.
                Entries are ordered by docsDevNmAccessIndex.  The first
                matching entry (e.g. matching IP address and community
                string) is used to derive access."
           INDEX { docsDevNmAccessIndex  }
           ::= {  docsDevNmAccessTable 1 }

   DocsDevNmAccessEntry ::= SEQUENCE {
               docsDevNmAccessIndex         Integer32,
               docsDevNmAccessIp            IpAddress,
               docsDevNmAccessIpMask        IpAddress,
               docsDevNmAccessCommunity     OCTET STRING,
               docsDevNmAccessControl       INTEGER,
               docsDevNmAccessInterfaces    OCTET STRING,
               docsDevNmAccessStatus        RowStatus,
               docsDevNmAccessTrapVersion   INTEGER
           }

   docsDevNmAccessIndex OBJECT-TYPE
           SYNTAX      Integer32 (1..2147483647)
           MAX-ACCESS  not-accessible
           STATUS      deprecated
           DESCRIPTION
               "Index used to order the application of access
                entries."
           ::= { docsDevNmAccessEntry 1 }

   docsDevNmAccessIp OBJECT-TYPE



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           SYNTAX      IpAddress
           MAX-ACCESS  read-create
           STATUS      deprecated
           DESCRIPTION
               "The IP address (or subnet) of the network management
                station. The address 0.0.0.0 is defined to mean
                any NMS. If traps are enabled for this entry, then the
                value must be the address of a specific device."
           DEFVAL { '00000000'h }
           ::= { docsDevNmAccessEntry 2 }

   docsDevNmAccessIpMask OBJECT-TYPE
           SYNTAX      IpAddress
           MAX-ACCESS  read-create
           STATUS      deprecated
           DESCRIPTION
               "The IP subnet mask of the network management stations.
                If traps are enabled for this entry, then the value must
                be 255.255.255.255."
           DEFVAL { '00000000'h }
           ::= { docsDevNmAccessEntry 3 }

   docsDevNmAccessCommunity OBJECT-TYPE
           SYNTAX      OCTET STRING (SIZE (0..32))
           MAX-ACCESS  read-create
           STATUS      deprecated
           DESCRIPTION
               "The community string to be matched for access by this
                entry. If set to a zero length string then any community
                string will match.  When read, this object SHOULD return a
                zero length string."
           DEFVAL { "public" }
           ::= { docsDevNmAccessEntry 4 }

   docsDevNmAccessControl OBJECT-TYPE
           SYNTAX         INTEGER {
               none(1),
               read(2),
               readWrite(3),
               roWithTraps(4),
               rwWithTraps(5),
               trapsOnly(6)
           }
           MAX-ACCESS  read-create
           STATUS      deprecated
           DESCRIPTION
               "Specifies the type of access allowed to this NMS. Setting
                this object to none(1) causes the table entry to be



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                destroyed. Read(2) allows access by 'get' and 'get-next'
                PDUs. ReadWrite(3) allows access by 'set' as well.
                RoWithtraps(4), rwWithTraps(5), and trapsOnly(6)
                control distribution of Trap PDUs transmitted by this
                device."
           DEFVAL { read }
           ::= { docsDevNmAccessEntry 5 }

   -- The syntax of the following object was copied from RFC1493,
   -- dot1dStaticAllowedToGoTo.

   docsDevNmAccessInterfaces OBJECT-TYPE
           SYNTAX      OCTET STRING (SIZE (1..32))
           MAX-ACCESS  read-create
           STATUS      deprecated
           DESCRIPTION
               "Specifies the set of interfaces from which requests from
                this NMS will be accepted.
                Each octet within the value of this object specifies a set
                of eight interfaces, with the first octet specifying ports
                1 through 8, the second octet specifying interfaces 9
                through 16, etc.  Within each octet, the most significant
                bit represents the lowest numbered interface, and the least
                significant bit represents the highest numbered interface.
                Thus, each interface is represented by a single bit within
                the value of this object. If that bit has a value of '1'
                then that interface is included in the set.

                Note that entries in this table apply only to link-layer
                interfaces (e.g., Ethernet and CATV MAC). Upstream and
                downstream channel interfaces must not be specified.

                Note that according to the DOCSIS OSSIv1.1 specification
                [32], when ifIndex '1' is included in the set, then this
                row applies to all CPE (customer-facing) interfaces.

                The size of this object is the minimum required to
                represent all configured interfaces for this device."
   --      DEFVAL is the bitmask corresponding to all interfaces
           ::= { docsDevNmAccessEntry 6 }

   docsDevNmAccessStatus OBJECT-TYPE
           SYNTAX      RowStatus
           MAX-ACCESS  read-create
           STATUS      deprecated
           DESCRIPTION
               "Controls and reflects the status of rows in this
                table. Rows in this table may be created by either the



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                create-and-go or create-and-wait paradigms.  There is no
                restriction on changing values in a row of this table while
                the row is active."
           ::= { docsDevNmAccessEntry 7 }

   docsDevNmAccessTrapVersion OBJECT-TYPE
           SYNTAX      INTEGER {
               disableSNMPv2trap(1),
               enableSNMPv2trap(2)
           }
           MAX-ACCESS  read-create
           STATUS      deprecated
           DESCRIPTION
               "Specifies the TRAP version that is sent to this NMS.
                Setting this object to disableSNMPv2trap (1) causes the
                trap in SNMPv1 format to be sent to particular NMS. Setting
                this object to enableSNMPv2trap (2) causes the trap in
                SNMPv2 format be sent to particular NMS."
           DEFVAL { disableSNMPv2trap }
           ::= { docsDevNmAccessEntry 8 }


   --
   --  Procedures for using the following group are described in section
   --  3.2.1 of this MIB
   --

   docsDevSoftware OBJECT IDENTIFIER ::= { docsDevMIBObjects 3 }

   docsDevSwServer OBJECT-TYPE
           SYNTAX      IpAddress
           MAX-ACCESS  read-write
           STATUS      deprecated
           DESCRIPTION
               "The address of the TFTP server used for software upgrades.
                If the TFTP server is unknown or is a V6 address, return
                0.0.0.0.

                This object is deprecated.  See docsDevSwServerAddress for
                its replacement.  This object will have its value modified
                given a valid SET to docsDevSwServerAddress."
           ::= { docsDevSoftware 1 }

   docsDevSwFilename OBJECT-TYPE
           SYNTAX      SnmpAdminString (SIZE (0..64))
           MAX-ACCESS  read-write
           STATUS      deprecated
           DESCRIPTION



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               "The file name of the software image to be loaded into this
                device via TFTP. Unless set via SNMP, this is the file name
                specified by the provisioning server that corresponds to
                the software version that is desired for this device.
                If unknown, the string '(unknown)' is returned.  If HTTP is
                used as the transport protocol, the empty string is
                returned.

                This object is deprecated.  See docsDevSwFilenameURL for
                its replacement.  This object will have its value modified
                given a valid SET to docsDevSwFilenameURL."
           ::= { docsDevSoftware 2 }

   docsDevSwAdminStatus OBJECT-TYPE
           SYNTAX INTEGER {
               upgradeFromMgt(1),
               allowProvisioningUpgrade(2),
               ignoreProvisioningUpgrade(3)
           }
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "If set to upgradeFromMgt(1), the device will initiate a TFTP
                or HTTP software image download using docsDevSwFilenameURL.
                After successfully receiving an image, the device will
                set its state to ignoreProvisioningUpgrade(3) and reboot.
                If the download process is interrupted by a reset or
                power failure, the device will load the previous image
                and, after re-initialization, continue to attempt loading
                the image specified in docsDevSwFilenameURL.

                If set to allowProvisioningUpgrade(2), the device will
                use the software version information supplied by the
                provisioning server when next rebooting (this does not
                cause a reboot).

                When set to ignoreProvisioningUpgrade(3), the device
                will disregard software image upgrade information from the
                provisioning server.

                Note that reading this object can return upgradeFromMgt(1).
                This indicates that a software download is currently in
                progress, and that the device will reboot after
                successfully receiving an image.

                At initial startup, this object has the default value of
                allowProvisioningUpgrade(2)."
           ::= { docsDevSoftware 3 }



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   docsDevSwOperStatus OBJECT-TYPE
           SYNTAX INTEGER {
               inProgress(1),
               completeFromProvisioning(2),
               completeFromMgt(3),
               failed(4),
               other(5)
           }
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "InProgress(1) indicates that a TFTP download is underway,
                either as a result of a version mismatch at provisioning
                or as a result of a upgradeFromMgt request.
                CompleteFromProvisioning(2) indicates that the last
                software upgrade was a result of version mismatch at
                provisioning. CompleteFromMgt(3) indicates that the last
                software upgrade was a result of setting
                docsDevSwAdminStatus to upgradeFromMgt.
                Failed(4) indicates that the last attempted download
                failed, ordinarily due to TFTP timeout."
           REFERENCE
                "DOCSIS Radio Frequency Interface Specification, Section
                8.2, Downloading Cable Modem Operating Software."
           ::= { docsDevSoftware 4 }

   docsDevSwCurrentVers OBJECT-TYPE
           SYNTAX      SnmpAdminString
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The software version currently operating in this device.
                This object should be in the syntax used by the individual
                vendor to identify software versions.  Any CM MUST return a
                string descriptive of the current software load.  For a
                CMTS, this object SHOULD contain either a human readable
                representation of the vendor specific designation of the
                software for the chassis, or of the software for the
                control processor. If neither of these is  applicable,
                this MUST contain an empty string."
           ::= { docsDevSoftware 5 }

   docsDevSwServerAddressType OBJECT-TYPE
           SYNTAX      InetAddressType
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "The type of address of the TFTP or HTTP server used for



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                software upgrades."
           ::= { docsDevSoftware 6 }

   docsDevSwServerAddress OBJECT-TYPE
           SYNTAX      InetAddress
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "The address of the TFTP or HTTP server used for software
                upgrades.

                If the TFTP/HTTP server is unknown, return the zero length
                address string (see the TextualConvention).
                If docsDevSwServer is also implemented in this agent, this
                object is tied to it.  A set of this object to an IPv4
                address will result in the value of docsDevSwServer also
                being set to that address.  If this object is set to an
                IPv6 address, docsDevSwServer is set to 0.0.0.0.
                If docsDevSwServer is set, this object is also set to that
                value.  Note that if both are set in the same action, the
                order of which one sets the other is undefined - so both
                should be the same value."
           ::= { docsDevSoftware 7 }

   docsDevSwServerTransportProtocol OBJECT-TYPE
           SYNTAX INTEGER {
               tftp(1),
               http(2),
               other(3)
           }
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "This object specifies the transport protocol (TFTP or
                HTTP) to be used for software upgrades."
           ::= { docsDevSoftware 8 }

   docsDevSwFilenameURL OBJECT-TYPE
           SYNTAX      SnmpAdminString (SIZE (0..64))
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "The file name of the software image to be loaded into this
                device in the URL format:
                <Protocol>://<server name>[:Port Number][/<path>/]
                  <filename>,
                Where Protocol MUST be HTTP or TFTP (case insensitive).
                Unless set via SNMP, this is the file name specified by



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                the provisioning server that corresponds to the software
                version that is desired for this device. If unknown, the
                string '(unknown)' is returned.

                If docsDevSwFilename is also implemented in this agent,
                this object is tied to it.  A set of this object to an
                TFTP URL will result in the value of docsDevSwFilename
                being set to the corresponding software file name, e.g.
                [/<path>/]<filename>.  If this object is set to an HTTP
                URL, docsDevSwFilename is set to an empty string. If
                docsDevSwFilename is set, this object is also set to
                that value.  Note that if both are set in the same action,
                the order of which one sets the other is undefined -- so
                both sets should be to the same value."
              ::= { docsDevSoftware 9 }

   --
   -- The following group describes server access and parameters used for
   -- initial provisioning and bootstrapping.
   --

   docsDevServer OBJECT IDENTIFIER ::= { docsDevMIBObjects 4 }

   docsDevServerBootState OBJECT-TYPE
           SYNTAX INTEGER {
               operational(1),
               disabled(2),
               waitingForDhcpOffer(3),
               waitingForDhcpResponse(4),
               waitingForTimeServer(5),
               waitingForTftp(6),
               refusedByCmts(7),
               forwardingDenied(8),
               other(9),
               unknown(10)
           }
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "If operational(1), the device has completed loading and
                processing of configuration parameters and the CMTS has
                completed the Registration exchange.
                If disabled(2) then the device was administratively
                disabled, possibly by being refused network access in the
                configuration file.
                If waitingForDhcpOffer(3) then a DHCP Discover has been
                transmitted and no offer has yet been received.
                If waitingForDhcpResponse(4) then a DHCP Request has been



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                transmitted and no response has yet been received.
                If waitingForTimeServer(5) then a Time Request has been
                transmitted and no response has yet been received.
                If waitingForTftp(6) then a request to the TFTP parameter
                server has been made and no response received.
                If refusedByCmts(7) then the Registration Request/Response
                exchange with the CMTS failed.
                If forwardingDenied(8) then the registration process
                completed, but the network access option in the received
                configuration file prohibits forwarding. "
           REFERENCE
                "DOCSIS Radio Frequency Interface Specification, Figure
                7-1, CM Initialization Overview."
           ::= { docsDevServer 1 }

   docsDevServerDhcp OBJECT-TYPE
           SYNTAX      IpAddress
           MAX-ACCESS  read-only
           STATUS      deprecated
           DESCRIPTION
               "The IP address of the DHCP server that assigned an IP
                address to this device. Returns 0.0.0.0 if DHCP was not
                used for IP address assignment, or if this agent was
                assigned an IPv6 address.

                Deprecated.  This object is replaced by
                docsDevServerDhcpAddress."
           ::= { docsDevServer 2 }

   docsDevServerTime OBJECT-TYPE
           SYNTAX      IpAddress
           MAX-ACCESS  read-only
           STATUS      deprecated
           DESCRIPTION
               "The IP address of the Time server (RFC-868). Returns
                0.0.0.0 if the time server IP address is unknown, or if
                the time server was an IPv6 server.

                Deprecated.  This object is replaced by
                docsDevServerTimeAddress."
           ::= { docsDevServer 3 }

   docsDevServerTftp OBJECT-TYPE
           SYNTAX      IpAddress
           MAX-ACCESS  read-only
           STATUS      deprecated
           DESCRIPTION
               "The IP address of the TFTP server responsible for



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                downloading provisioning and configuration parameters
                to this device. Returns 0.0.0.0 if the TFTP server
                address is unknown or is an IPv6 address.

                Deprecated.  This object is replaced by
                docsDevServerConfigTftpAddress."
           ::= { docsDevServer 4 }

   docsDevServerConfigFile OBJECT-TYPE
           SYNTAX      SnmpAdminString
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The name of the device configuration file read from the
                TFTP server. Returns an empty string if the configuration
                file name is unknown."
           ::= { docsDevServer 5 }

   docsDevServerDhcpAddressType OBJECT-TYPE
           SYNTAX      InetAddressType
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The type of address of docsDevServerDhcpAddress."
           ::= { docsDevServer 6 }

   docsDevServerDhcpAddress OBJECT-TYPE
           SYNTAX      InetAddress
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The IP v4 or v6 address of the DHCP server that assigned
                an IP address to this device. Returns the zero length octet
                string if DHCP was not used for IP address assignment."
           ::= { docsDevServer 7 }

   docsDevServerTimeAddressType OBJECT-TYPE
           SYNTAX      InetAddressType
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The type of address of docsDevServerTimeAddress."
           ::= { docsDevServer 8 }

   docsDevServerTimeAddress OBJECT-TYPE
           SYNTAX      InetAddress
           MAX-ACCESS  read-only
           STATUS      current



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           DESCRIPTION
               "The IP V4 or V6 address of the Time server
                (RFC-868). Returns the zero length octet string if the time
                server IP address is unknown."
           ::= { docsDevServer 9 }

   docsDevServerConfigTftpAddressType OBJECT-TYPE
           SYNTAX      InetAddressType
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The type of address of docsDevServerConfigTftpAddress."
           ::= { docsDevServer 10 }

   docsDevServerConfigTftpAddress OBJECT-TYPE
           SYNTAX      InetAddress
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The IP V4 or V6  address of the TFTP server responsible
                for downloading provisioning and configuration parameters
                to this device.  Returns the zero length octet string if
                the config server address is unknown."
           ::= { docsDevServer 11 }

   --
   --  Event Reporting
   --

   docsDevEvent OBJECT IDENTIFIER ::= { docsDevMIBObjects 5 }

   docsDevEvControl OBJECT-TYPE
           SYNTAX INTEGER {
               resetLog(1),
               useDefaultReporting(2)
           }
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "Setting this object to resetLog(1) empties the event log.
                All data is deleted. Setting it to useDefaultReporting(2)
                returns all event priorities to their factory-default
                reporting. Reading this object always returns
                useDefaultReporting(2)."
           ::= { docsDevEvent 1 }

   docsDevEvSyslog OBJECT-TYPE
           SYNTAX      IpAddress



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           MAX-ACCESS  read-write
           STATUS      deprecated
           DESCRIPTION
               "The IP address of the Syslog server. If 0.0.0.0, syslog
                transmission is either inhibited, or if
                docsDevEvSyslogAddress exists in this agent - may be an
                IPv6 device.

                Deprecated.  See docsDevEvSyslogAddress."
           ::= { docsDevEvent 2 }

   docsDevEvThrottleAdminStatus OBJECT-TYPE
           SYNTAX INTEGER {
               unconstrained(1),
               maintainBelowThreshold(2),
               stopAtThreshold(3),
               inhibited(4)
           }
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "Controls the transmission of traps and syslog messages
                with respect to the trap pacing threshold.
                unconstrained(1) causes traps and syslog messages to be
                transmitted without regard to the threshold settings.
                maintainBelowThreshold(2) causes trap transmission and
                syslog messages to be suppressed if the number of traps
                would otherwise exceed the threshold.
                stopAtThreshold(3) causes trap transmission to cease at the
                threshold, and not resume until directed to do so.
                inhibited(4) causes all trap transmission and syslog
                messages to be suppressed.

                A single event is always treated as a single event for
                threshold counting. That is, an event causing both a trap
                and a syslog message is still treated as a single event.

                Writing to this object resets the thresholding state.

                At initial startup, this object has a default value of
                unconstrained(1)."
           ::= { docsDevEvent 3 }

   docsDevEvThrottleInhibited OBJECT-TYPE
           SYNTAX      TruthValue
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION



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               "If true(1), trap and syslog transmission is currently
                inhibited due to thresholds and/or the current setting of
                docsDevEvThrottleAdminStatus. In addition, it MAY be set
                to true(1) if transmission is inhibited due to no syslog
                (docsDevEvSyslog) or trap (docsDevNmAccessEntry)
                destinations having been set, or if the configuration of
                snmpTargetAddress and snmpCommunityTable do not allow
                the device to send traps."
           ::= { docsDevEvent 4 }

   docsDevEvThrottleThreshold OBJECT-TYPE
           SYNTAX      Unsigned32
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "Number of trap/syslog events per docsDevEvThrottleInterval
                to be transmitted before throttling.

                A single event is always treated as a single event for
                threshold counting. That is, an event causing both a trap
                and a syslog message is still treated as a single event.

                At initial startup, this object returns 0."
           ::= { docsDevEvent 5 }

   docsDevEvThrottleInterval OBJECT-TYPE
           SYNTAX      Integer32 (1..2147483647)
           UNITS       "seconds"
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "The interval over which the trap threshold applies.
                At initial startup, this object has a value of 1."
           ::= { docsDevEvent 6 }

   --
   -- The following table controls the reporting of the various classes of
   -- events.
   --

   docsDevEvControlTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF DocsDevEvControlEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "This table allows control of the reporting of event
                classes.  For each event priority, a combination of logging
                and reporting mechanisms may be chosen. The mapping of



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                event types to priorities is vendor-dependent.  Vendors may
                also choose to allow the user to control that mapping
                through proprietary means."
           ::= {  docsDevEvent 7 }


   docsDevEvControlEntry OBJECT-TYPE
           SYNTAX      DocsDevEvControlEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "Allows configuration of the reporting mechanisms for a
                particular event priority."
           INDEX { docsDevEvPriority }
           ::= { docsDevEvControlTable 1 }

   DocsDevEvControlEntry ::= SEQUENCE {
               docsDevEvPriority        INTEGER,
               docsDevEvReporting       BITS
           }

   docsDevEvPriority OBJECT-TYPE
           SYNTAX INTEGER {
               emergency(1),
               alert(2),
               critical(3),
               error(4),
               warning(5),
               notice(6),
               information(7),
               debug(8)
           }
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "The priority level that is controlled by this
                entry. These are ordered from most (emergency) to least
                (debug) critical.  Each event with a CM or CMTS has a
                particular priority level associated with it (as defined by
                the vendor). During normal operation no event more critical
                than notice(6) should be generated. Events between warning
                and emergency should be generated at appropriate levels of
                problems (e.g. emergency when the box is about to
                crash)."
           ::= { docsDevEvControlEntry 1 }

   docsDevEvReporting OBJECT-TYPE
           SYNTAX BITS {



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               localNonvolatile(0),
               traps(1),
               syslog(2),
               localVolatile(3)
           }
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "Defines the action to be taken on occurrence of this
                event class. Implementations may not necessarily support
                all options for all event classes, but at minimum must
                allow traps and syslogging to be disabled. If the
                localNonvolatile(0) bit is set, then log to the internal
                log -- both the volatile and non-volatile versions, for
                backward compatibility with the object definition from
                RFC 2669.  If the traps(1) bit is set, then generate an
                SNMP trap, and if the syslog(2) bit is set, then send a
                syslog message (assuming the syslog address is set).  If
                the localVolatile(3) bit is set, then log to the internal
                volatile log.

                An event reported by trap or syslog logging MUST be
                accompanied by localVolatile logging.  If the bit value
                for either traps(1) or syslog(2) is set, then the agent
                MUST enforce that the bit value for localNonvolatile(0)
                or localVolatile(3) is set as well."
           ::= { docsDevEvControlEntry 2 }

   docsDevEventTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF DocsDevEventEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "Contains a log of network and device events that may be
                of interest in fault isolation and troubleshooting."
           ::= {  docsDevEvent 8 }

   docsDevEventEntry OBJECT-TYPE
           SYNTAX      DocsDevEventEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "Describes a network or device event that may be of
                interest in fault isolation and troubleshooting. Multiple
                sequential identical events are represented by
                incrementing docsDevEvCounts and setting
                docsDevEvLastTime to the current time rather than creating
                multiple rows.



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                Entries are created with the first occurrance of an event.
                docsDevEvControl can be used to clear the table.
                Individual events can not be deleted."
           INDEX { docsDevEvIndex }
           ::= { docsDevEventTable 1 }

   DocsDevEventEntry ::= SEQUENCE {
               docsDevEvIndex           Integer32,
               docsDevEvFirstTime       DateAndTime,
               docsDevEvLastTime        DateAndTime,
               docsDevEvCounts          Counter32,
               docsDevEvLevel           INTEGER,
               docsDevEvId              Unsigned32,
               docsDevEvText            SnmpAdminString
           }

   docsDevEvIndex OBJECT-TYPE
           SYNTAX      Integer32 (1..2147483647)
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "Provides relative ordering of the objects in the event
                log. This object will always increase except when
                (a) the log is reset via docsDevEvControl,
                (b) the device reboots and does not implement non-volatile
                storage for this log, or (c) it reaches the value 2^31.
                The next entry for all the above cases is 1."
           ::= { docsDevEventEntry 1 }

   docsDevEvFirstTime OBJECT-TYPE
           SYNTAX      DateAndTime
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The value of docsDevDateTime at the time this entry was
                created."
           ::= { docsDevEventEntry 2 }

   docsDevEvLastTime OBJECT-TYPE
           SYNTAX      DateAndTime
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "If multiple events are reported via the same entry, the
                value of docsDevDateTime that the last event for this entry
                occurred, otherwise this should have the same value as
                docsDevEvFirstTime. "
           ::= { docsDevEventEntry 3 }



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   docsDevEvCounts OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The number of consecutive event instances reported by
                this entry.  This starts at 1 with the creation of this
                row and increments by 1 for each subsequent duplicate
                event."
           ::= { docsDevEventEntry 4 }

   docsDevEvLevel OBJECT-TYPE
           SYNTAX INTEGER {
               emergency(1),
               alert(2),
               critical(3),
               error(4),
               warning(5),
               notice(6),
               information(7),
               debug(8)
           }
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "The priority level of this event as defined by the
                vendor.  These are ordered from most serious (emergency)
                to least serious (debug)."
           ::= { docsDevEventEntry 5 }

   --
   -- Vendors will provide their own enumerations for the following.
   -- The interpretation of the enumeration is unambiguous for a
   -- particular value of the vendor's enterprise number in sysObjectID.
   --

   docsDevEvId OBJECT-TYPE
           SYNTAX      Unsigned32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "For this product, uniquely identifies the type of event
                that is reported by this entry."
           ::= { docsDevEventEntry 6 }

   docsDevEvText OBJECT-TYPE
           SYNTAX      SnmpAdminString
           MAX-ACCESS  read-only



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           STATUS      current
           DESCRIPTION
               "Provides a human-readable description of the event,
                including all relevant context (interface numbers,
                etc.)."
           ::= { docsDevEventEntry 7 }

   docsDevEvSyslogAddressType OBJECT-TYPE
           SYNTAX      InetAddressType
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "The type of address of docsDevEvSyslogAddress."
           ::= { docsDevEvent 9 }

   docsDevEvSyslogAddress OBJECT-TYPE
           SYNTAX      InetAddress
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "The IP V4 or V6 address of the Syslog server.  If the
                address of the server is set to any of the zero length
                string, the 0.0.0.0 V4 address or the 0: V6 address, syslog
                transmission is inhibited.  By default at agent boot, this
                object returns the zero length string."
           ::= { docsDevEvent 10 }

   --
   -- Link Level Control Filtering
   --

   docsDevFilter OBJECT IDENTIFIER ::= { docsDevMIBObjects 6 }

   docsDevFilterLLCUnmatchedAction OBJECT-TYPE
           SYNTAX INTEGER {
               discard(1),
               accept(2)
           }
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "LLC (Link Level Control) filters can be defined on an
                inclusive or exclusive basis: CMs can be configured to
                forward only packets matching a set of layer three
                protocols, or to drop packets matching a set of layer
                three protocols.  Typical use of these filters is to
                filter out possibly harmful (given the context of a large
                metropolitan LAN) protocols.



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                If set to discard(1), any L2 packet which does not match at
                least one filter in the docsDevFilterLLCTable will be
                discarded. If set to accept(2), any L2 packet which does
                not match at least one filter in the docsDevFilterLLCTable
                will be accepted for further processing (e.g.,
                bridging). In otherwords, if the packet does not match an
                entry in the table it takes this action, if it does match
                an entry in the table it takes the opposite of this
                action. At initial system startup, this object returns
                accept(2)."
           ::= { docsDevFilter 1 }

   docsDevFilterLLCTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF DocsDevFilterLLCEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "A list of filters to apply to (bridged) LLC
                traffic. The filters in this table are applied to
                incoming traffic on the appropriate interface(s)  prior
                to any further processing (e.g. before handing the packet
                off for level 3 processing, or for bridging).  The
                specific action taken when no filter is matched is
                controlled by docsDevFilterLLCUnmatchedAction."
           ::= { docsDevFilter 2 }

   docsDevFilterLLCEntry OBJECT-TYPE
           SYNTAX      DocsDevFilterLLCEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "Describes a single filter to apply to (bridged) LLC traffic
                received on a specified interface. "
           INDEX { docsDevFilterLLCIndex }
           ::= { docsDevFilterLLCTable 1 }

   DocsDevFilterLLCEntry ::= SEQUENCE {
               docsDevFilterLLCIndex               Integer32,
               docsDevFilterLLCStatus              RowStatus,
               docsDevFilterLLCIfIndex             InterfaceIndexOrZero,
               docsDevFilterLLCProtocolType        INTEGER,
               docsDevFilterLLCProtocol            Integer32,
               docsDevFilterLLCMatches             Counter32,
               docsDevFilterLLCInterfaces          OCTET STRING,
               docsDevFilterLLCInterfaceSet        InterfaceSet
           }

   docsDevFilterLLCIndex OBJECT-TYPE



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           SYNTAX      Integer32 (1..2147483647)
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "Index used for the identification of filters (note that LLC
                filter order is irrelevant)."
           ::= { docsDevFilterLLCEntry 1 }

   docsDevFilterLLCStatus OBJECT-TYPE
           SYNTAX      RowStatus
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "Controls and reflects the status of rows in this
                table. There is no restriction on changing any of the
                associated columns for this row while this object is set
                to active."
           ::= { docsDevFilterLLCEntry 2}

   docsDevFilterLLCIfIndex OBJECT-TYPE
           SYNTAX      InterfaceIndexOrZero
           MAX-ACCESS  read-create
           STATUS      deprecated
           DESCRIPTION
               "The entry interface to which this filter applies.  The
                value corresponds to ifIndex for either a CATV MAC or
                another network interface. If the value is zero, the filter
                applies to all interfaces. In Cable Modems, the default
                value is the customer side interface. In Cable Modem
                Termination Systems, this object has to be specified to
                create a row in this table.

                Note that according to the DOCSIS OSSIv1.1 specification
                [32], when ifIndex '1' is included in the set, then this
                row applies to all CPE (customer-facing) interfaces.

                DEPRECATED.  If the docsDevFilterLLCInterfaces object
                exists in this agent and row, then the value of this object
                is ignored for purposes of filtering."
           ::= { docsDevFilterLLCEntry 3 }

   docsDevFilterLLCProtocolType OBJECT-TYPE
           SYNTAX INTEGER {
               ethertype(1),
               dsap(2)
           }
           MAX-ACCESS  read-create
           STATUS      current



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           DESCRIPTION
               "The format of the value in docsDevFilterLLCProtocol:
                either a two-byte Ethernet Ethertype, or a one-byte
                802.2 SAP value. EtherType(1) also applies to SNAP-
                encapsulated frames."
           DEFVAL { ethertype }
           ::= { docsDevFilterLLCEntry 4 }

   docsDevFilterLLCProtocol OBJECT-TYPE
           SYNTAX      Integer32 (0..65535)
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "The layer three protocol for which this filter applies.
                The protocol value format depends on
                docsDevFilterLLCProtocolType. Note that for SNAP frames,
                etherType filtering is performed rather than DSAP=0xAA."
           DEFVAL { 0 }
           ::= { docsDevFilterLLCEntry 5 }

   docsDevFilterLLCMatches OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "Counts the number of times this filter was matched."
           ::= { docsDevFilterLLCEntry 6 }

   docsDevFilterLLCInterfaces OBJECT-TYPE
           SYNTAX  OCTET STRING (SIZE (1..32))
           MAX-ACCESS read-create
           STATUS  current
           DESCRIPTION
               "Specifies the set of interfaces this filter applies to.
                Each octet within the value of this object specifies a set
                of eight interfaces, with the first octet specifying
                interfaces 1 through 8, the second octet specifying
                interfaces 9 through 16, etc.  Within each octet, the most
                significant bit represents the lowest numbered interface,
                and the least significant bit represents the highest
                numbered interface.  Thus, each interface is represented by
                a single bit within the value of this object.  If that bit
                has a value of '1' then that interface is included in this
                set.

                The actual mapping of physical interfaces to interface
                number is implementation dependent."
           ::= { docsDevFilterLLCEntry 7 }



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   docsDevFilterLLCInterfaceSet OBJECT-TYPE
           SYNTAX     InterfaceSet
           MAX-ACCESS read-create
           STATUS  current
           DESCRIPTION
               "This is a convenience object for setting the value of
                docsDevFilterLLCInterfaces.  Upon a valid set, this causes
                docsDevFilterLLCInterfaces in the same row to be set to a
                bit mask set consisting of the interfaces which match the
                class type represented by this object.  Upon read, this
                returns 'other' by definition."
           DEFVAL { allCpe }
           ::= { docsDevFilterLLCEntry 8 }

   docsDevFilterIpDefault OBJECT-TYPE
           SYNTAX INTEGER {
               discard(1),
               accept(2)
           }
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "The default behavior for (bridged) packets that do not
                match IP filters is defined by docsDevFilterIpDefault.

                If set to discard(1), all packets not matching an IP filter
                will be discarded. If set to accept(2), all packets not
                matching an IP filter will be accepted for further
                processing (e.g., bridging).

                At initial system startup, this object returns accept(2)."
           ::= { docsDevFilter 3 }

   docsDevFilterIpTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF DocsDevFilterIpEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "An ordered list of filters or classifiers to apply to
                IP traffic. Filter application is ordered by the filter
                index, rather than by a best match algorithm (Note that
                this implies that the filter table may have gaps in the
                index values). Packets which match no filters will have
                policy 0 in the docsDevFilterPolicyTable applied to them if
                it exists. Otherwise, Packets which match no filters
                are discarded or forwarded according to the setting of
                docsDevFilterIpDefault.




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                Any IP packet can theoretically match multiple rows of
                this table.  When considering a packet, the table is
                scanned in row index order (e.g. filter 10 is checked
                before filter 20).  If the packet matches that filter
                (which means that it matches ALL criteria for that row),
                actions appropriate to docsDevFilterIpControl and
                docsDevFilterPolicyId are taken.  If the packet was
                discarded processing is complete.  If
                docsDevFilterIpContinue is set to true, the filter
                comparison continues with the next row in the table
                looking for additional matches.

                If the packet matches no filter in the table, the packet
                is accepted or dropped for further processing based on
                the setting of docsDevFilterIpDefault. If the packet is
                accepted, the actions specified by policy group 0
                (e.g. the rows in docsDevFilterPolicyTable which have a
                value of 0 for docsDevFilterPolicyId) are taken if that
                policy group exists.

                Logically, this table is consulted twice during the
                processing of any IP packet - once upon its acceptance
                from the L2 entity, and once upon its transmission to the
                L2 entity.  In actuality, for cable modems, IP filtering
                is generally the only IP processing done for transit
                traffic.  This means that inbound and outbound filtering
                can generally be done at the same time with one pass
                through the filter table."
           ::= { docsDevFilter 4 }

   docsDevFilterIpEntry OBJECT-TYPE
           SYNTAX      DocsDevFilterIpEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "Describes a filter to apply to IP traffic received on a
                specified interface.  All identity objects in this table
                (e.g. source and destination address/mask, protocol,
                source/dest port, TOS/mask, interface and direction) must
                match their respective fields in the packet for any given
                filter to match.

                To create an entry in this table, docsDevFilterIpIfIndex
                must be specified."
           INDEX { docsDevFilterIpIndex }
           ::= { docsDevFilterIpTable 1 }

   DocsDevFilterIpEntry ::= SEQUENCE {



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               docsDevFilterIpIndex             Integer32,
               docsDevFilterIpStatus            RowStatus,
               docsDevFilterIpControl           INTEGER,
               docsDevFilterIpIfIndex           InterfaceIndexOrZero,
               docsDevFilterIpDirection         INTEGER,
               docsDevFilterIpBroadcast         TruthValue,
               docsDevFilterIpSaddr             IpAddress,
               docsDevFilterIpSmask             IpAddress,
               docsDevFilterIpDaddr             IpAddress,
               docsDevFilterIpDmask             IpAddress,
               docsDevFilterIpProtocol          Integer32,
               docsDevFilterIpSourcePortLow     Integer32,
               docsDevFilterIpSourcePortHigh    Integer32,
               docsDevFilterIpDestPortLow       Integer32,
               docsDevFilterIpDestPortHigh      Integer32,
               docsDevFilterIpMatches           Counter32,
               docsDevFilterIpTos               OCTET STRING,
               docsDevFilterIpTosMask           OCTET STRING,
               docsDevFilterIpContinue          TruthValue,
               docsDevFilterIpPolicyId          Integer32,
               docsDevFilterIpInterfaces        OCTET STRING,
               docsDevFilterIpInterfaceSet      InterfaceSet
           }

   docsDevFilterIpIndex OBJECT-TYPE
           SYNTAX      Integer32 (1..2147483647)
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "Index used to order the application of filters.
                The filter with the lowest index is always applied
                first."
           ::= { docsDevFilterIpEntry 1 }

   docsDevFilterIpStatus OBJECT-TYPE
           SYNTAX      RowStatus
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "Controls and reflects the status of rows in this
                table. Specifying only this object (with the appropriate
                index) on a CM is sufficient to create a filter row which
                matches all inbound packets on the ethernet interface,
                and results in the packets being
                discarded. docsDevFilterIpIfIndex (at least) must be
                specified on a CMTS to create a row.  Creation of the
                rows may be done via either create-and-wait or
                create-and-go, but the filter is not applied until this



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                object is set to (or changes to) active. There is no
                restriction in changing any object in a row while this
                object is set to active."
           ::= { docsDevFilterIpEntry 2 }

   docsDevFilterIpControl OBJECT-TYPE
           SYNTAX INTEGER {
               discard(1),
               accept(2),
               policy(3)
           }
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "If set to discard(1), all packets matching this filter
                will be discarded and scanning of the remainder of the
                filter list will be aborted. If set to accept(2), all
                packets matching this filter will be accepted for further
                processing (e.g., bridging). If docsDevFilterIpContinue
                is set to true, see if there are other matches, otherwise
                done. If set to policy (3), execute the policy entries
                matched by docsDevFilterIpPolicyId in
                docsDevFilterPolicyTable.

                If is docsDevFilterIpContinue is set to true, continue
                scanning the table for other matches, otherwise done."
           DEFVAL { discard }
           ::= { docsDevFilterIpEntry 3 }

   docsDevFilterIpIfIndex OBJECT-TYPE
           SYNTAX      InterfaceIndexOrZero
           MAX-ACCESS  read-create
           STATUS      deprecated
           DESCRIPTION
               "The entry interface to which this filter applies. The
                value corresponds to ifIndex for either a CATV MAC or
                another interface. If the value is zero, the
                filter applies to all interfaces. Default value in Cable
                Modems is the index of the customer-side (e.g. ethernet)
                interface. In Cable Modem Termination Systems, this
                object MUST be specified to create a row in this table.

                Note that according to the DOCSIS OSSIv1.1 specification
                [32], when ifIndex '1' is included in the set, then this
                row applies to all CPE (customer-facing) interfaces.

                DEPRECATED.  If the docsDevFilterIpInterfaces object
                exists in this agent and row, then the value of this object



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                is ignored for purposes of filtering AND this object need
                not be specified to create a row in this table."
           ::= { docsDevFilterIpEntry 4 }

   docsDevFilterIpDirection OBJECT-TYPE
           SYNTAX INTEGER {
               inbound(1),
               outbound(2),
               both(3)
           }
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "Determines whether the filter is applied to inbound(1)
                traffic, outbound(2) traffic, or traffic in both(3)
                directions."
           DEFVAL { inbound }
           ::= { docsDevFilterIpEntry 5 }

   docsDevFilterIpBroadcast OBJECT-TYPE
           SYNTAX      TruthValue
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "If set to true(1), the filter only applies to multicast
                and broadcast traffic. If set to false(2), the filter
                applies to all traffic."
           DEFVAL { false }
           ::= { docsDevFilterIpEntry 6 }

   docsDevFilterIpSaddr OBJECT-TYPE
           SYNTAX      IpAddress
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "The source IP address, or portion thereof, that is to be
                matched for this filter.  The source address is first
                masked (and'ed) against docsDevFilterIpSmask before being
                compared  to this value.  A value of 0 for this object
                and 0 for the mask matches all IP addresses."
           DEFVAL { '00000000'h }
           ::= { docsDevFilterIpEntry 7 }

   docsDevFilterIpSmask OBJECT-TYPE
           SYNTAX      IpAddress
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION



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               "A bit mask that is to be applied to the source address
                prior to matching. This mask is not necessarily the same
                as a subnet mask, but 1's bits must be leftmost and
                contiguous."
           DEFVAL { '00000000'h }
           ::= { docsDevFilterIpEntry 8 }

   docsDevFilterIpDaddr OBJECT-TYPE
           SYNTAX      IpAddress
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "The destination IP address, or portion thereof, that is
                to be matched for this filter. The destination address is
                first masked (and'ed) against docsDevFilterIpDmask before
                being compared to this value.  A value of 0 for this object
                and 0 for the mask matches all IP addresses."
           DEFVAL { '00000000'h }
           ::= { docsDevFilterIpEntry 9 }

   docsDevFilterIpDmask OBJECT-TYPE
           SYNTAX      IpAddress
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "A bit mask that is to be applied to the destination
                address prior to matching. This mask is not necessarily
                the same as a subnet mask, but 1's bits must be leftmost
                and contiguous."
           DEFVAL { '00000000'h }
           ::= { docsDevFilterIpEntry 10 }

   docsDevFilterIpProtocol OBJECT-TYPE
           SYNTAX Integer32 (0..256)
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "The IP protocol value that is to be matched. For example:
                icmp is 1, tcp is 6, udp is 17. A value of 256 matches
                ANY protocol."
           DEFVAL { 256 }
           ::= { docsDevFilterIpEntry 11 }

   docsDevFilterIpSourcePortLow OBJECT-TYPE
           SYNTAX      Integer32 (0..65535)
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION



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               "If docsDevFilterIpProtocol is udp or tcp, this is the
                inclusive lower bound of the transport-layer source port
                range that is to be matched, otherwise it is ignored
                during matching."
           DEFVAL { 0 }
           ::= { docsDevFilterIpEntry 12 }

   docsDevFilterIpSourcePortHigh OBJECT-TYPE
           SYNTAX      Integer32 (0..65535)
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "If docsDevFilterIpProtocol is udp or tcp, this is the
                inclusive upper bound of the transport-layer source port
                range that is to be matched, otherwise it is ignored
                during matching."
           DEFVAL { 65535 }
           ::= { docsDevFilterIpEntry 13 }

   docsDevFilterIpDestPortLow OBJECT-TYPE
           SYNTAX      Integer32 (0..65535)
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "If docsDevFilterIpProtocol is udp or tcp, this is the
                inclusive lower bound of the transport-layer destination
                port range that is to be matched, otherwise it is ignored
                during matching."
           DEFVAL { 0 }
           ::= { docsDevFilterIpEntry 14 }

   docsDevFilterIpDestPortHigh OBJECT-TYPE
           SYNTAX      Integer32 (0..65535)
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "If docsDevFilterIpProtocol is udp or tcp, this is the
                inclusive upper bound of the transport-layer destination
                port range that is to be matched, otherwise it is ignored
                during matching."
           DEFVAL { 65535 }
           ::= { docsDevFilterIpEntry 15 }

   docsDevFilterIpMatches OBJECT-TYPE
           SYNTAX      Counter32
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION



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               "Counts the number of times this filter was matched.
                This object is initialized to 0 at boot, or at row
                creation, and is reset only upon reboot."
           ::= { docsDevFilterIpEntry 16 }

   docsDevFilterIpTos  OBJECT-TYPE
           SYNTAX      OCTET STRING ( SIZE (1))
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "This is the value to be matched to the packet's
                TOS (Type of Service) value (after the TOS value
                is AND'd with docsDevFilterIpTosMask).  A value for this
                object of 0 and a mask of 0 matches all TOS values."
           DEFVAL { '00'h }
           ::= { docsDevFilterIpEntry 17 }

   docsDevFilterIpTosMask OBJECT-TYPE
           SYNTAX      OCTET STRING ( SIZE (1) )
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "The mask to be applied to the packet's TOS value before
                matching."
           DEFVAL { '00'h }
           ::= { docsDevFilterIpEntry 18 }

   docsDevFilterIpContinue OBJECT-TYPE
           SYNTAX      TruthValue
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "If this value is set to true, and docsDevFilterIpControl
                is anything but discard (1), continue scanning and
                applying policies."
           DEFVAL { false }
           ::= { docsDevFilterIpEntry 19 }

   docsDevFilterIpPolicyId OBJECT-TYPE
           SYNTAX      Integer32 (0..2147483647)
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "This object points to an entry in docsDevFilterPolicyTable.
                If docsDevFilterIpControl is set to policy (3), execute
                all matching policies in docsDevFilterPolicyTable.
                If no matching policy exists, treat as if
                docsDevFilterIpControl were set to accept (1).



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                If this object is set to the value of 0, there is no
                matching policy, and docsDevFilterPolicyTable MUST NOT be
                consulted."
           DEFVAL { 0 }
           ::= { docsDevFilterIpEntry 20 }

   docsDevFilterIpInterfaces OBJECT-TYPE
           SYNTAX      OCTET STRING (SIZE (1..32))
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "Specifies the set of interfaces this filter applies to.
                Each octet within the value of this object specifies a set
                of eight interfaces, with the first octet specifying
                interfaces 1 through 8, the second octet specifying
                interfaces 9 through 16, etc.  Within each octet, the most
                significant bit represents the lowest numbered interface,
                and the least significant bit represents the highest
                numbered interface.  Thus, each interface is represented by
                a single bit within the value of this object.  If that bit
                has a value of '1' then that interface is included in this
                set."
           ::= { docsDevFilterIpEntry 21 }

   docsDevFilterIpInterfaceSet OBJECT-TYPE
           SYNTAX     InterfaceSet
           MAX-ACCESS read-create
           STATUS  current
           DESCRIPTION
               "This is a convenience object for setting the value of
                docsDevFilterIpInterfaces.  Upon read this always returns
                other (1).  Upon a valid set, this causes
                docsDevFilterIpInterfaces in the same row to be set to a
                bit mask set consisting of the interfaces which match the
                class type represented by this object."
           DEFVAL { allCpe }
           ::= { docsDevFilterIpEntry 22 }

   --
   -- Policy Mapping Table
   --

   docsDevFilterPolicyTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF DocsDevFilterPolicyEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "A Table which maps between a policy group ID and a set of



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                policies to be applied.  All rows with the same
                docsDevFilterPolicyId are part of the same policy group
                and are applied in the order in which they are in this
                table.

                docsDevFilterPolicyTable exists to allow multiple policy
                actions to be applied to any given classified packet. The
                policy actions are applied in index order. For example:

                Index   ID    Type    Action
                 1      1      TOS     1
                 9      5      TOS     1
                 12     1      IPSEC   3

                This says that a packet which matches a filter with
                policy id 1, first has TOS policy 1 applied (which might
                set the TOS bits to enable a higher priority), and next
                has the IPSEC policy 3 applied (which may result in the
                packet being dumped into a secure VPN to a remote
                encryptor).

                Policy ID 0 is reserved for default actions and is
                applied only to packets which match no filters in
                docsDevFilterIpTable."
           ::= { docsDevFilter 5 }

   docsDevFilterPolicyEntry OBJECT-TYPE
           SYNTAX      DocsDevFilterPolicyEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "An entry in the docsDevFilterPolicyTable. Entries are
                created by Network Management. To create an entry,
                docsDevFilterPolicyId and docsDevFilterPolicyAction
                must be specified."
           INDEX { docsDevFilterPolicyIndex }
           ::= { docsDevFilterPolicyTable 1 }

   DocsDevFilterPolicyEntry ::= SEQUENCE {
               docsDevFilterPolicyIndex   Integer32,
               docsDevFilterPolicyId      Integer32,
               docsDevFilterPolicyType    INTEGER, -- obsolete
               docsDevFilterPolicyAction  Integer32, -- obsolete
               docsDevFilterPolicyStatus  RowStatus,
               docsDevFilterPolicyPtr     RowPointer
           }

   docsDevFilterPolicyIndex OBJECT-TYPE



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           SYNTAX      Integer32 (1..2147483647)
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION "Index value for the table."
           ::= { docsDevFilterPolicyEntry 1 }

   docsDevFilterPolicyId OBJECT-TYPE
           SYNTAX      Integer32 (0..2147483647)
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
                "Policy ID for this entry. A policy ID can apply to
                 multiple rows of this table, all relevant policies are
                 executed. Policy 0 (if populated) is applied to all
                 packets which do not match any of the filters. N.B. If
                 docsDevFilterIpPolicyId is set to 0, it DOES NOT match
                 policy 0 of this table."
           ::= { docsDevFilterPolicyEntry 2 }

   docsDevFilterPolicyType OBJECT-TYPE
           SYNTAX INTEGER {
               other(1),
               tos (2)
           }
           MAX-ACCESS  read-create
           STATUS      obsolete
           DESCRIPTION
                "This object was removed from the policy mapping table
                 with the introduction of external policy action tables
                 prior to publication as RFC 2669."
           ::= { docsDevFilterPolicyEntry 3}

   docsDevFilterPolicyAction OBJECT-TYPE
           SYNTAX      Integer32 (1..2147483647)
           MAX-ACCESS  read-create
           STATUS      obsolete
           DESCRIPTION
                "This object was removed from the policy mapping table
                 with the introduction of external policy action tables
                 prior to publication as RFC 2669."
           ::= { docsDevFilterPolicyEntry 4 }

   docsDevFilterPolicyStatus OBJECT-TYPE
           SYNTAX      RowStatus
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "Object used to create an entry in this table."



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           ::= { docsDevFilterPolicyEntry 5 }

   docsDevFilterPolicyPtr OBJECT-TYPE
           SYNTAX      RowPointer
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "This object points to a row in an applicable filter policy
                table.  Currently, the only standard policy table is
                docsDevFilterTosTable. Per the textual convention, this
                object points to the first accessible object in the row.
                E.g. to point to a row in docsDevFilterTosTable with an
                index of 21, the value of this object would be the object
                identifier docsDevTosStatus.21.

                Vendors must adhere to the same convention when adding
                vendor specific policy table extensions.

                The default upon row creation is a null pointer which
                results in no policy action being taken."
           DEFVAL { zeroDotZero }
           ::= { docsDevFilterPolicyEntry 6 }

   --
   -- TOS Policy action table
   --

   docsDevFilterTosTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF DocsDevFilterTosEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
                "Table used to describe Type of Service (TOS) bits
                processing.

                This table is an adjunct to the docsDevFilterIpTable, and
                the docsDevFilterPolicy table.  Entries in the latter
                table can point to specific rows in this (and other)
                tables and cause specific actions to be taken.  This table
                permits the manipulation of the value of the Type of
                Service bits in the IP header of the matched packet as
                follows:

                Set the tosBits of the packet to
                   (tosBits & docsDevFilterTosAndMask) |
                   docsDevFilterTosOrMask

                This construct allows you to do a clear and set of all



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                the TOS bits in a flexible manner."
           ::= { docsDevFilter 6 }

   docsDevFilterTosEntry OBJECT-TYPE
           SYNTAX      DocsDevFilterTosEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
                "A TOS policy entry."
           INDEX { docsDevFilterTosIndex }
           ::= { docsDevFilterTosTable 1 }

   DocsDevFilterTosEntry ::= SEQUENCE {
               docsDevFilterTosIndex   Integer32,
               docsDevFilterTosStatus  RowStatus,
               docsDevFilterTosAndMask OCTET STRING,
               docsDevFilterTosOrMask  OCTET STRING
           }

   docsDevFilterTosIndex OBJECT-TYPE
           SYNTAX      Integer32 (1..2147483647)
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "The unique index for this row.  There are no ordering
                requirements for this table and any valid index may be
                specified."
           ::= { docsDevFilterTosEntry 1 }

   docsDevFilterTosStatus OBJECT-TYPE
           SYNTAX      RowStatus
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "The object used to create and delete entries in this
                table. A row created by specifying just this object
                results in a row which specifies no change to the TOS
                bits.   A row may be created using either the create-and-go
                or create-and-wait paradigms. There is no restriction on
                the ability to change values in this row while the row is
                active."
           ::= { docsDevFilterTosEntry 2 }

   docsDevFilterTosAndMask OBJECT-TYPE
           SYNTAX      OCTET STRING (SIZE (1))
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION



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               "This value is bitwise AND'd with the matched  packet's
                TOS bits."
           DEFVAL { 'ff'h }
           ::= { docsDevFilterTosEntry 3 }

   docsDevFilterTosOrMask OBJECT-TYPE
           SYNTAX      OCTET STRING (SIZE (1))
           MAX-ACCESS  read-create
           STATUS      current
           DESCRIPTION
               "After bitwise AND'ing with the above bits, the packet's
                TOS bits are bitwise OR'd with these bits, and the
                packet's TOS BITS are set to that value."
           DEFVAL { '00'h }
           ::= { docsDevFilterTosEntry 4 }

   docsDevFilterIpV6AuxTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF DocsDevFilterIpV6AuxEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "This table augments docsDevFilterIpTable with objects
                that allow filtering of IPv6 packets. The objects in this
                table exactly mirror the IPv4 objects in
                docsDevFilterIpTable, but become active for purposes of
                filtering if and only if docsDevFilterIpType is set to
                ipv6."
           ::= { docsDevFilter 7 }

   docsDevFilterIpV6AuxEntry OBJECT-TYPE
           SYNTAX      DocsDevFilterIpV6AuxEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "This augments the existing objects in
                docsDevFilterIpEntry, but by default the objects in this
                entry have no effect on filtering as docsDevFilterIpType
                defaults to ipv4 upon row creation."
           AUGMENTS   { docsDevFilterIpEntry }
           ::= { docsDevFilterIpV6AuxTable 1 }

   DocsDevFilterIpV6AuxEntry ::= SEQUENCE {
           docsDevFilterIpType     InetAddressType,
           docsDevFilterIpV6Saddr  InetAddressIPv6,
           docsDevFilterIpV6Smask  InetAddressIPv6,
           docsDevFilterIpV6Daddr  InetAddressIPv6,
           docsDevFilterIpV6Dmask  InetAddressIPv6
       }



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   docsDevFilterIpType OBJECT-TYPE
           SYNTAX  InetAddressType
           MAX-ACCESS read-create
           STATUS  current
           DESCRIPTION
               "This object controls whether this filter entry refers to
                IP v4 or v6 type packets.  If this object is ipv4, then the
                IpAddress objects docsDevFilterEntry apply, otherwise if
                this object is ipv6 then the remaining objects in this
                entry apply."
           DEFVAL { ipv4 }
           ::= { docsDevFilterIpV6AuxEntry 1}

   docsDevFilterIpV6Saddr OBJECT-TYPE
           SYNTAX  InetAddressIPv6
           MAX-ACCESS read-create
           STATUS  current
           DESCRIPTION
               "The source address IPv6 address or portion thereof that
                is to be matched for this filter.  The packet's source
                address is first masked (and'ed) against
                docsDevFilterIpV6Smask before being compared to this value.
                A value of of all zeros for this object and for the mask
                matches all IPv6 addresses."
           DEFVAL { '00000000000000000000000000000000'h }
           ::= { docsDevFilterIpV6AuxEntry 2 }

   docsDevFilterIpV6Smask OBJECT-TYPE
           SYNTAX  InetAddressIPv6
           MAX-ACCESS read-create
           STATUS  current
           DESCRIPTION
               "A bit mask that is to be applied to the packet's source
                address prior to matching.  The mask is not necessarily the
                same as a subnet mask, the the 1's bits must be leftmost
                and contiguous."
           DEFVAL { '00000000000000000000000000000000'h }
           ::= { docsDevFilterIpV6AuxEntry 3 }

   docsDevFilterIpV6Daddr OBJECT-TYPE
           SYNTAX  InetAddressIPv6
           MAX-ACCESS read-create
           STATUS  current
           DESCRIPTION
               "The destination address IPv6 address or portion thereof
                that is to be matched for this filter.  The packet's source
                address is first masked (and'ed) against
                docsDevFilterIpV6Dmask before being compared to this value.



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                A value of of all zeros for this object and for the mask
                matches all IPv6 addresses."
           DEFVAL { '00000000000000000000000000000000'h }
           ::= { docsDevFilterIpV6AuxEntry 4 }

   docsDevFilterIpV6Dmask OBJECT-TYPE
           SYNTAX  InetAddressIPv6
           MAX-ACCESS read-create
           STATUS  current
           DESCRIPTION
               "A bit mask that is to be applied to the packet's
                destination address prior to matching.  The mask is not
                necessarily the same as a subnet mask, the the 1's bits
                must be leftmost and contiguous."
           DEFVAL { '00000000000000000000000000000000'h }
           ::= { docsDevFilterIpV6AuxEntry 5 }

   --
   -- CPE IP Management and anti spoofing group.  Only implemented on
   -- Cable Modems.
   --

   docsDevCpe OBJECT IDENTIFIER ::= { docsDevMIBObjects 7}

   docsDevCpeEnroll OBJECT-TYPE
           SYNTAX      INTEGER {
               none(1),
               any(2)
           }
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "This object controls the population of
                docsDevFilterCpeTable.
                If set to none, the filters must be set manually.
                If set to any, the CM wiretaps the packets originating
                from the ethernet and enrolls up to docsDevCpeIpMax
                addresses based on the source IPv4 or v6 addresses of those
                packets. At initial system startup, default value for this
                object is any(2)."
           ::= { docsDevCpe 1 }

   docsDevCpeIpMax OBJECT-TYPE
           SYNTAX      Integer32 (-1..2147483647)
           MAX-ACCESS  read-write
           STATUS      current
           DESCRIPTION
               "This object controls the maximum number of CPEs allowed



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                to be learned behind this device. If set to zero, any
                number of CPEs may connect up to the maximum permitted for
                the device.
                If set to -1, no filtering is done on CPE source addresses,
                and no entries are made in the docsDevFilterCpeTable via
                learning. If an  attempt is made to set this to a number
                greater than that permitted for the device, it is set to
                that maximum. At initial system startup, default value for
                this object is -1."
           ::= { docsDevCpe 2 }

   docsDevCpeTable OBJECT-TYPE
           SYNTAX      SEQUENCE OF DocsDevCpeEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "This table lists the IP addresses seen (or permitted) as
                source addresses in packets originating from the customer
                interface on this device. In addition, this table can be
                provisioned with the specific addresses permitted for the
                CPEs via the normal row creation mechanisms.


                N.B.  Management action can add entries in this table and
                in docsDevCpeIpTable past the value of docsDevCpeIpMax.
                docsDevCpeIpMax ONLY restricts the ability of the CM to
                automatically add learned addresses."
           ::= { docsDevCpe 3 }

   docsDevCpeEntry OBJECT-TYPE
           SYNTAX      DocsDevCpeEntry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "An entry in the docsDevFilterCpeTable. There is one entry
                for each IP CPE seen or provisioned. If docsDevCpeIpMax
                is set to -1, this table is ignored, otherwise: Upon
                receipt of an IP packet from the customer interface of the
                CM, the source IP address is checked against this table. If
                the address is in the table, packet processing continues.
                If the address is not in the table, but docsDevCpeEnroll
                is set to any and the sum of the  table sizes of
                docsDevCpeTable and docsDevCpeV6Table is less than
                docsDevCpeIpMax, the address is added to the table and
                packet processing continues. Otherwise, the packet is
                dropped.

                The filtering actions specified by this table occur after



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                any LLC filtering (docsDevFilterLLCTable), but prior
                to any IP filtering (docsDevFilterIpTable,
                docsDevNmAccessTable)."
           INDEX   { docsDevCpeIp }
           ::= {docsDevCpeTable 1 }

   DocsDevCpeEntry ::= SEQUENCE {
               docsDevCpeIp      IpAddress,
               docsDevCpeSource  INTEGER,
               docsDevCpeStatus  RowStatus
           }

   docsDevCpeIp OBJECT-TYPE
           SYNTAX      IpAddress
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "The IP address to which this entry applies.

                N.B.  Neither the all zeros or all ones addresses may be
                used as the value of this object."
           ::= { docsDevCpeEntry 1 }

   docsDevCpeSource OBJECT-TYPE
           SYNTAX      INTEGER {
               other(1),
               manual(2),
               learned(3)
           }
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "This object describes how this entry was created. If the
                value is manual(2), this row was created by a network
                management action (either configuration, or SNMP set).
                If set to learned(3), then it was found via
                looking at the source IP address of a received packet."
           ::= { docsDevCpeEntry 2 }

   docsDevCpeStatus OBJECT-TYPE
           SYNTAX  RowStatus
           MAX-ACCESS  read-create
           STATUS  current
           DESCRIPTION
               "Standard object to manipulate rows. To create a row in this
                table, you only need to specify this object. Management
                stations SHOULD use the create-and-go mechanism for
                creating rows in this table."



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           ::= { docsDevCpeEntry 3 }

   docsDevCpeV6Table OBJECT-TYPE
           SYNTAX      SEQUENCE OF DocsDevCpeV6Entry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "This table lists the IP V6 addresses seen (or permitted) as
                source addresses in packets originating from the customer
                interface on this device. In addition, this table can be
                provisioned with the specific addresses permitted for the
                CPEs via the normal row creation mechanisms.

                N.B.  Management action can add entries in this table and
                in docsDevCpeIpTable past the value of docsDevCpeIpMax.
                docsDevCpeIpMax ONLY restricts the ability of the CM to
                automatically add learned addresses.

                This table exactly mirrors docsDevCpeTable and applies only
                to IPv6 addresses."
           ::= { docsDevCpe 4 }

   docsDevCpeV6Entry OBJECT-TYPE
           SYNTAX      DocsDevCpeV6Entry
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "An entry in the docsDevFilterCpeTable. There is one entry
                for each IP V6 CPE seen or provisioned. If docsDevCpeIpMax
                is set to -1, this table is ignored, otherwise: Upon
                receipt of an IPv6 packet from the customer interface of
                the CM, the source IP address is checked against this
                table. If the address is in the table, packet processing
                continues. If the address is not in the table, but
                docsDevCpeEnroll is set to any and the sum of the table
                sizes for docsDevCpeTable and docsDevCpeV6Tble is less than
                docsDevCpeIpMax, the address is added to the table and
                packet processing continues. Otherwise, the packet is
                dropped.

                The filtering actions specified by this table occur after
                any LLC filtering (docsDevFilterLLCTable), but prior
                to any IP filtering (docsDevFilterIpTable,
                docsDevNmAccessTable)."
           INDEX   { docsDevCpeV6Ip }
           ::= {docsDevCpeV6Table 1 }

   DocsDevCpeV6Entry ::= SEQUENCE {



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               docsDevCpeV6Ip      InetAddressIPv6,
               docsDevCpeV6Source  INTEGER,
               docsDevCpeV6Status  RowStatus
           }

   docsDevCpeV6Ip OBJECT-TYPE
           SYNTAX      InetAddressIPv6
           MAX-ACCESS  not-accessible
           STATUS      current
           DESCRIPTION
               "The IP address to which this entry applies.

                N.B. Neither the all zeros or all ones addresses may be
                used as values for this object."
           ::= { docsDevCpeV6Entry 1 }

   docsDevCpeV6Source OBJECT-TYPE
           SYNTAX      INTEGER {
               other(1),
               manual(2),
               learned(3)
           }
           MAX-ACCESS  read-only
           STATUS      current
           DESCRIPTION
               "This object describes how this entry was created. If the
                value is manual(2), this row was created by a network
                management action (either configuration, or SNMP set).
                If set to learned(3), then it was found via looking at the
                source IP address of a received packet."
           ::= { docsDevCpeV6Entry 2 }

   docsDevCpeV6Status OBJECT-TYPE
           SYNTAX  RowStatus
           MAX-ACCESS  read-create
           STATUS  current
           DESCRIPTION
               "Standard object to manipulate rows. To create a row in this
                table, you only need to specify this object. Management
                stations SHOULD use the create-and-go mechanism for
                creating rows in this table."
           ::= { docsDevCpeV6Entry 3 }

   docsDevVacmAccessExtTable OBJECT-TYPE
           SYNTAX  SEQUENCE OF DocsDevVacmAccessExtEntry
           MAX-ACCESS not-accessible
           STATUS  current
           DESCRIPTION



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               "This table extends the VACM access table by adding a set
                of objects which represent the interfaces to which the
                referenced VACM view applies."
           ::= { docsDevMIBObjects 8 }

   docsDevVacmAccessExtEntry OBJECT-TYPE
           SYNTAX  DocsDevVacmAccessExtEntry
           MAX-ACCESS not-accessible
           STATUS  current
           DESCRIPTION
               "This entry logically extends vacmAccessEntry with two
                objects - an interface bit set and an InterfaceSet
                convenience object which sets the bit set."
           AUGMENTS   { vacmAccessEntry }
           ::= {docsDevVacmAccessExtTable 1 }

   DocsDevVacmAccessExtEntry ::= SEQUENCE {
           docsDevVacmAccessInterfaces     OCTET STRING,
           docsDevVacmAccessInterfaceSet   InterfaceSet
       }


   docsDevVacmAccessInterfaces OBJECT-TYPE
           SYNTAX  OCTET STRING (SIZE(1..32))
           MAX-ACCESS read-create
           STATUS  current
           DESCRIPTION
                "Specifies the set of interfaces this filter applies to.
                 Each octet within the value of this object specifies a set
                 of eight interfaces, with the first octet specifying
                 interfaces 1 through 8, the second octet specifying
                 interfaces 9 through 16, etc.  Within each octet, the most
                 significant bit represents the lowest numbered interface,
                 and the least significant bit represents the highest
                 numbered interface.  Thus, each interface is represented
                 by a single bit within the value of this object.  If that
                 bit has a value of '1' then that interface is included in
                 this set. If the bit has a value of '0' then the view
                 represented by the related objects in vacmAccessEntry are
                 not accessible from requests received on that interface."
           ::= { docsDevVacmAccessExtEntry 1 }

   docsDevVacmAccessInterfaceSet OBJECT-TYPE
           SYNTAX  InterfaceSet
           MAX-ACCESS read-create
           STATUS  current
           DESCRIPTION
               "This is a convenience object for setting the value of



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                docsDevVacmAccessInterfaces.  Upon read this always returns
                other (1).  Upon a valid set, this causes
                docsDevVacmAccessInterfaces in the same row to be set to a
                bit mask set consisting of the interfaces which match the
                class type represented by this object."
           DEFVAL { all }
           ::= { docsDevVacmAccessExtEntry 2 }

   --
   -- Placeholder for notifications/traps.
   --

   docsDevNotification OBJECT IDENTIFIER   ::= { docsDev 2 }

   --
   -- Conformance definitions
   --

   docsDevConformanceV2  OBJECT IDENTIFIER   ::= { docsDev 4 }
   docsDevGroupsV2       OBJECT IDENTIFIER   ::= { docsDevConformanceV2 1}
   docsDevCompliancesV2  OBJECT IDENTIFIER   ::= { docsDevConformanceV2 2}

   docsDevBasicComplianceV2 MODULE-COMPLIANCE
           STATUS  current
           DESCRIPTION
               "The compliance statement for DOCSIS Cable Modems and
                Cable Modem Termination Systems."

   MODULE  -- docsDev

   -- conditionally mandatory groups

   GROUP docsDevBaseGroupV2
           DESCRIPTION
               "Mandatory in Cable Modems, optional in Cable Modem
                Termination Systems."

   GROUP docsDevEventGroupV2
           DESCRIPTION
               "Mandatory in Cable Modems, optional in Cable Modem
                Termination Systems."

   GROUP docsDevFilterGroupV2
           DESCRIPTION
               "Mandatory in Cable Modems, optional in Cable Modem
                Termination Systems."

   GROUP docsDevNmAccessGroupV2



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           DESCRIPTION
               "This group is only implemented in devices which do not
                implement SNMPv3 User Security Model.  It SHOULD NOT be
                implemented by SNMPv3 conformant devices.

                For devices which do not implement SNMPv3 or later, this
                group is Mandatory in Cable Modems and is optional
                in Cable Modem Termination Systems."

   GROUP docsDevServerGroupV2
           DESCRIPTION
               "This group is implemented only in Cable Modems and is
                not implemented in Cable Modem Termination Systems."

   GROUP docsDevSoftwareGroupV2
           DESCRIPTION
               "This group is Mandatory in Cable Modems and  optional in
                Cable Modem Termination Systems."

   GROUP docsDevCpeGroupV2
           DESCRIPTION
               "This group is Mandatory in Cable Modems, and is
                not implemented in Cable Modem Termination Systems.  A
                similar capability for CMTS devices may be proposed later
                after study."

   OBJECT docsDevDateTime
            MIN-ACCESS read-only
            DESCRIPTION
                "It is compliant to implement this object as read-only."

   OBJECT docsDevSTPControl
            MIN-ACCESS read-only
            DESCRIPTION
                "It is compliant to implement this object as read-only.
                 Devices need only support noStFilterBpdu(2)."

   OBJECT docsDevIgmpModeControl
            MIN-ACCESS read-only
            DESCRIPTION
                "It is compliant to implement this object as read-only.
                 Devices need only support passive(1)."

   OBJECT docsDevEvReporting
            MIN-ACCESS read-only
            DESCRIPTION
                "It is compliant to implement this object as read-only.
                 Devices need only support local(0)."



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   OBJECT docsDevFilterLLCInterfaceSet
            WRITE-SYNTAX   INTEGER {
                   allCpe(2),
                   allNetwork (3),
                   allCpeEthernet (4),
                   allCpeUsb (5),
                   allCpeFirewire (6),
                   allExternal (7),
                   allInternal (8),
                   all (9),
                   application1 (10),
                   application2 (11),
                   application3 (12),
                   application4 (13)
                   }
            DESCRIPTION
                "'other' is a return value only and may not be SET."

   OBJECT docsDevFilterIpInterfaceSet
            WRITE-SYNTAX   INTEGER {
                   allCpe(2),
                   allNetwork (3),
                   allCpeEthernet (4),
                   allCpeUsb (5),
                   allCpeFirewire (6),
                   allExternal (7),
                   allInternal (8),
                   all (9),
                   application1 (10),
                   application2 (11),
                   application3 (12),
                   application4 (13)
                   }
            DESCRIPTION
                "'other' is a return value only and may not be SET."

            ::= { docsDevCompliancesV2 1 }

   docsDevBaseGroupV2 OBJECT-GROUP
           OBJECTS {
                docsDevRole,
                docsDevDateTime,
                docsDevResetNow,
                docsDevSerialNumber,
                docsDevSTPControl,
                docsDevIgmpModeControl,
                docsDevMaxCpe
           }



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           STATUS      current
           DESCRIPTION
               "A collection of objects providing device status and
                control."
           ::= { docsDevGroupsV2 1 }

   docsDevNmAccessGroupV2 OBJECT-GROUP
           OBJECTS {
                docsDevNmAccessIp,
                docsDevNmAccessIpMask,
                docsDevNmAccessCommunity,
                docsDevNmAccessControl,
                docsDevNmAccessInterfaces,
                docsDevNmAccessStatus,
                docsDevNmAccessTrapVersion
           }
           STATUS      deprecated
           DESCRIPTION
               "A collection of objects for controlling access to SNMP
                objects.

                Deprecated in favor of SNMPv3 and coexistence MIB."
           ::= { docsDevGroupsV2 2 }

   docsDevSoftwareGroupV2 OBJECT-GROUP
           OBJECTS {
               docsDevSwAdminStatus,
               docsDevSwOperStatus,
               docsDevSwCurrentVers,
               docsDevSwServerAddressType,
               docsDevSwServerAddress,
               docsDevSwServerTransportProtocol,
               docsDevSwFilenameURL
           }
           STATUS      current
           DESCRIPTION
               "A collection of objects for controlling software
                downloads."
           ::= { docsDevGroupsV2 3 }

   docsDevServerGroupV2 OBJECT-GROUP
           OBJECTS {
               docsDevServerBootState,
               docsDevServerDhcpAddressType,
               docsDevServerDhcpAddress,
               docsDevServerTimeAddressType,
               docsDevServerTimeAddress,
               docsDevServerConfigTftpAddressType,



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               docsDevServerConfigTftpAddress,
               docsDevServerConfigFile
           }
           STATUS      current
           DESCRIPTION
               "A collection of objects providing status about server
                provisioning."
           ::= { docsDevGroupsV2 4 }

   docsDevEventGroupV2 OBJECT-GROUP
           OBJECTS {
               docsDevEvControl,
               docsDevEvThrottleAdminStatus,
               docsDevEvThrottleInhibited,
               docsDevEvThrottleThreshold,
               docsDevEvThrottleInterval,
               docsDevEvReporting,
               docsDevEvFirstTime,
               docsDevEvLastTime,
               docsDevEvCounts,
               docsDevEvLevel,
               docsDevEvId,
               docsDevEvText,
               docsDevEvSyslogAddressType,
               docsDevEvSyslogAddress
           }
           STATUS      current
           DESCRIPTION
               "A collection of objects used to control and monitor
                events."
           ::= { docsDevGroupsV2 5 }

   docsDevFilterGroupV2 OBJECT-GROUP
           OBJECTS {
               docsDevFilterLLCUnmatchedAction,
               docsDevFilterIpDefault,
               docsDevFilterLLCStatus,
               docsDevFilterLLCProtocolType,
               docsDevFilterLLCProtocol,
               docsDevFilterLLCMatches,
               docsDevFilterLLCInterfaces,
               docsDevFilterLLCInterfaceSet,
               docsDevFilterIpControl,
               docsDevFilterIpStatus,
               docsDevFilterIpDirection,
               docsDevFilterIpBroadcast,
               docsDevFilterIpSaddr,
               docsDevFilterIpSmask,



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               docsDevFilterIpDaddr,
               docsDevFilterIpDmask,
               docsDevFilterIpProtocol,
               docsDevFilterIpSourcePortLow,
               docsDevFilterIpSourcePortHigh,
               docsDevFilterIpDestPortLow,
               docsDevFilterIpDestPortHigh,
               docsDevFilterIpMatches,
               docsDevFilterIpInterfaces,
               docsDevFilterIpInterfaceSet,
               docsDevFilterIpTos,
               docsDevFilterIpTosMask,
               docsDevFilterIpContinue,
               docsDevFilterIpPolicyId,
               docsDevFilterPolicyId,
               docsDevFilterPolicyStatus,
               docsDevFilterPolicyPtr,
               docsDevFilterTosStatus,
               docsDevFilterTosAndMask,
               docsDevFilterTosOrMask
           }
           STATUS      current
           DESCRIPTION
               "A collection of objects to specify filters at link layer
                and IP layer."
           ::= { docsDevGroupsV2 6 }

   docsDevCpeGroupV2 OBJECT-GROUP
           OBJECTS {
              docsDevCpeEnroll,
              docsDevCpeIpMax,
              docsDevCpeSource,
              docsDevCpeStatus
           }
           STATUS      current
           DESCRIPTION
               "A collection of objects used to control the number
                and specific values of IP addresses allowed for
                associated Customer Premises Equipment (CPE)."
           ::= { docsDevGroupsV2 7 }

   docsDevDeprecatedGroup OBJECT-GROUP
           OBJECTS {
              docsDevFilterLLCIfIndex,
              docsDevFilterIpIfIndex,
              docsDevSwServer,
              docsDevSwFilename,
              docsDevServerDhcp,



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              docsDevServerTime,
              docsDevServerTftp,
              docsDevEvSyslog
           }
           STATUS     deprecated
           DESCRIPTION
               "These objects have been deprecated to deal with the
                IPv6, SNMPv3 and redefinition of the CM as a multiple CPE
                device.  They MAY be implemented, but will be removed in
                the next iteration of this MIB."
           ::= { docsDevGroupsV2 8 }

   docsDevIpV6Group OBJECT-GROUP
           OBJECTS {
              docsDevFilterIpType,
              docsDevFilterIpV6Saddr,
              docsDevFilterIpV6Smask,
              docsDevFilterIpV6Daddr,
              docsDevFilterIpV6Dmask,
              docsDevCpeV6Source,
              docsDevCpeV6Status
              }
           STATUS     current
           DESCRIPTION
               "These objects were added to deal with the filtering of
                IPV6 addresses.  They MUST be implemented in any IPv6 aware
                cable modem."
           ::= { docsDevGroupsV2 9 }

   docsDevSnmpCoexistGroup OBJECT-GROUP
           OBJECTS {
              docsDevVacmAccessInterfaces,
              docsDevVacmAccessInterfaceSet
           }
           STATUS     current
           DESCRIPTION
               "These objects were added to retain the capability to
                restrict SNMP access on a per interface basis."
           ::= { docsDevGroupsV2 10 }

   docsDevObsoletedGroup OBJECT-GROUP
           OBJECTS {
              docsDevFilterPolicyType,
              docsDevFilterPolicyAction
           }
           STATUS     obsolete
           DESCRIPTION
               "These objects have been obsoleted, and MUST NOT be



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                implemented."
           ::= { docsDevGroupsV2 11 }

   END

5.  Acknowledgments

   This document is a production of the IPCDN Working Group, and is a
   revision of RFC 2669, "Cable Device Management Information Base for
   DOCSIS Compliant Cable Modems and Cable Modem Termination Systems"
   [26].  Mike StJohns and Guenter Roeck served well as the editors of
   previous versions of this MIB.

   The editor specifically wishes to thank Howard Abramson, Eduardo
   Cardona, Andre Lejeune, Jean-Francois Mule, Greg Nakanishi, Pak
   Siripunkaw, Boris Tsekinovski, and Bill Yost for their contributions
   to this document.

6.  Revision Descriptions

   [Note to RFC Editor - this section may be removed upon publication as
   an RFC.]  This document contains the following revisions over
   RFC2669:

   o    All IPv4 address objects were either deprecated and replaced, or
        mirrored with IPv6 objects where appropriate, following the
        guidelines of RFC 3291 [29].

   o    Objects which were obviated by the SNMPv3 coexistence MIBs have
        been deprecated, e.g. docsDevNmAccessTable.  The SNMPv3 VACM
        table has been augmented with objects which can limit access
        based on the interface on which an agent (CM) receives SNMP
        packets.

   o    The interface pointer objects in the filter tables have been
        replaced with a bit set object and convenience enumeration
        object to deal with the fact that CMs have been redefined as
        multiple CPE interface devices.

   o    New objects (docsDevSwServerTransportProtocol and
        docsDevSwFilenameURL) have been added to docsDevSoftware, and
        other object DESCRIPTIONs have been modified, to enable the
        use of either TFTP or HTTP for software downloads to the device.

   o    A new object, docsDevIgmpModeControl, has been added to control
        passive versus active IGMP modem operation, per [28].

   o    A new object, docsDevMaxCpe, has been added to report the



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        maximum number of CPEs granted network access across the CM.

   o    Minor updates to the description text have been made to a number
        of objects to clarify their meaning.

   o    The compliance statements were updated to reflect current
        requirements.  The entire RFC2669 compliance statement was
        omitted.

7.  References

   [1]  Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture for
        Describing SNMP Management Frameworks", RFC 2571, April 1999.

   [2]  Rose, M. and K. McCloghrie, "Structure and Identification of
        Management Information for TCP/IP-based Internets", STD 16, RFC
        1155, May 1990.

   [3]  Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16,
        RFC 1212, March 1991.

   [4]  Rose, M., "A Convention for Defining Traps for use with the
        SNMP", RFC 1215, March 1991.

   [5]  McCloghrie, K., Perkins, D. and J. Schoenwaelder, "Structure of
        Management Information for Version 2 (SMIv2)", STD 58, RFC 2578,
        April 1999.

   [6]  McCloghrie, K., Perkins, D. and J. Schoenwaelder, "Textual
        Conventions for SMIv2", STD 58, RFC 2579, April 1999.

   [7]  McCloghrie, K., Perkins, D. and J. Schoenwaelder, "Conformance
        Statements for SMIv2", STD 58, RFC 2580, April 1999.

   [8]  Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple
        Network Management Protocol", STD 15, RFC 1157, May 1990.

   [9]  Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
        "Introduction to Community-based SNMPv2", RFC 1901, January
        1996.

   [10] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Transport
        Mappings for Version 2 of the Simple Network Management Protocol
        (SNMPv2)", RFC 1906, January 1996.

   [11] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message
        Processing and Dispatching for the Simple Network Management
        Protocol (SNMP)", RFC 2572, April 1999.



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   [12] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM)
        for version 3 of the Simple Network Management Protocol
        (SNMPv3)", RFC 2574, April 1999.

   [13] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Protocol
        Operations for Version 2 of the Simple Network Management
        Protocol (SNMPv2)", RFC 1905, January 1996.

   [14] Levi, D., Meyer, P. and B. Stewart, "SNMP Applications", RFC
        2573, April 1999.

   [15] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access
        Control Model (VACM) for the Simple Network Management Protocol
        (SNMP)", RFC 2575, April 1999.

   [16] "Data-Over-Cable Service Interface Specifications: DOCSIS 1.0
        Radio Frequency Interface Specification SCTE 22-1 2002", SCTE
        Data Standards Subcommittee, 2002,
        http://www.scte.org/standards/.

   [17] L. Steinberg, "Techniques for Managing Asynchronously Generated
        Alerts", RFC 1224, May 1991.

   [18] "Data-Over-Cable Service Interface Specifications: DOCSIS 1.0
        Operations Support System Interface Specification Radio
        Frequency Interface SCTE 22-3 2002", SCTE Data Standards
        Subcommittee, 2002, http://www.scte.org/standards/.

   [19] Bradner, S., "Key words for use in RFCs to Indicate Requirement
        Levels", RFC 2119, Harvard University, March 1997

   [20] "Data-Over-Cable Service Interface Specifications: DOCSIS 1.0
        Baseline Privacy Interface Specification SCTE 22-2 2002", SCTE
        Data Standards Subcommittee, 2002,
        http://www.scte.org/standards/.

   [21] Frye, R., Levi, D., Routhier, S., and B. Wijnen, "Coexistence
        between Version 1, Version 2, and Version 3 of the Internet-
        standard Network Management Framework", RFC 2576, CoSine
        Communications, Nortel Networks, Integrated Systems Inc.,
        Lucent Technologies, March 2000

   [22] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access
        Control Model (VACM) for the Simple Network Management Protocol
        (SNMP)", RFC 2575, IBM T. J. Watson Research, BMC Software Inc.,
        Cisco Systems, Inc., April 1999

   [23] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction



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        to Version 3 of the Internet-standard Network Management
        Framework", RFC 2570, April 1999.

   [24] Gao, J., and P. Siripunkaw, "Event Notification Management
        Information Base for DOCSIS 1.1 Compliant Cable Modems and
        Cable Modem Termination Systems", work in progress.

   [25] Sawyer, W., "Management Information Base for DOCSIS Cable Modem
        Termination Systems for Subscriber Management", work in
        progress.

   [26] StJohns, M., "Cable Device Management Information Base for
        DOCSIS Compliant Cable Modems and Cable Modem Termination
        Systems", RFC 2669, August 1999.

   [27] Patrick, M, "Data Over Cable System Quality of Service
        Management Information Base (DOCSIS-QOS MIB)", work in progress.

   [28] Abramson, H., "Application of the IGMP MIB, RFC 2933, and Cable
        Device MIB, RFC 2669, to Docsis 1.1 Devices", work in progress.

   [29] Daniele, M., Haberman, B., Routhier, S., and J. Schoenwaelder,
        "Textual Conventions for Internet Network Addresses", RFC 3291,
        May 2002.

   [30] Ziemba, G., Reed, D., and P. Traina, "Security Considerations
        for IP Fragment Filtering", RFC 1858, October 1995.

   [31] Miller, I., "Protection against a Variant of the Tiny Fragment
        Attack", RFC 3128, June 2001.

   [32] "Data-Over-Cable Service Interface Specifications: Operations
        Support System Interface Specification SP-OSSIv1.1-I06-020830",
        CableLabs, August 2002,
        http://www.cablemodem.com/specifications/.


8.  Security Considerations

   This MIB relates to a system which will provide metropolitan public
   internet access.  As such, improper manipulation of the objects
   represented by this MIB may result in denial of service to a large
   number of end-users.  In addition, manipulation of the
   docsDevNmAccessTable, docsDevFilterLLCTable, docsDevFilterIpTable and
   the elements of the docsDevCpe group may allow an end-user to
   increase their service levels, spoof their IP addresses, change the
   permitted management stations, or affect other end-users in either a
   positive or negative manner.



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   It is recommended that the implementers prevent the "tiny fragment"
   and "overlapping fragment" attacks for the IP filtering tables in
   this MIB, as discussed in RFC 1858 [30] and RFC 3128 [31].

   Prevention of these attacks can be implemented with the following
   rules, when TCP source and/or destination port filtering is enabled:

   o    admit all packets with fragment offset >= 2

   o    discard all packets with fragment offset = 1, or with fragment
        offset = 0 AND fragment payload length < 16.

   o    apply filtering rules to all packets with fragment offset = 0.


   There are a number of management objects defined in this MIB that
   have a MAX-ACCESS clause of read-write and/or read-create.  Such
   objects may be considered sensitive or vulnerable in some network
   environments.  The support for SET operations in a non-secure
   environment without proper protection can have a negative effect on
   network operations.  In addition to those mentioned above:

   o    The use of docsDevNmAccessTable to specify management stations
        is considered to be only limited protection and does not protect
        against attacks which spoof the management station's IP address.
        The use of stronger mechanisms such as SNMPv3 security should be
        considered where possible.  Specifically, SNMPv3 VACM and USM
        MUST be used with any v3 agent which implements this MIB.
        Administrators may also wish to consider whether even read
        access to docsDevNmAccessTable may be undesirable under certain
        circumstances.

   o    The CM may have its software changed by the actions of the
        management system.  An improper software load may result in
        substantial vulnerabilities and the loss of the ability of the
        management system to control the cable modem.

   o    The device may be reset by setting docsDevResetNow = true(1).
        This causes the device to reload its configuration files as well
        as eliminating all previous non-persistent network management
        settings. As such, this may provide a vector for attacking the
        system.

   o    Setting docsDevEvThrottleAdminStatus = unconstrained(1) (which
        is also the DEFVAL) may cause flooding of traps, which can
        disrupt network service.

   This MIB does not affect confidentiality of services on a cable modem



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   system.  [20] specifies the implementation of the DOCSIS Baseline
   privacy mechanism.

   SNMPv1 by itself is not a secure environment.  Even if the network
   itself is secure (for example by using IPSec), even then, there is no
   control as to who on the secure network is allowed to access and
   GET/SET (read/change/create/delete) the objects in this MIB.

   It is recommended that the implementers consider the security
   features as provided by the SNMPv3 framework.  Specifically, the use
   of the User-based Security Model [12] and the View-based Access
   Control Model [15] is recommended.

   It is then a customer/user responsibility to ensure that the SNMP
   entity giving access to an instance of this MIB, is properly
   configured to give access to the objects only to those principals
   (users) that have legitimate rights to indeed GET or SET
   (change/create/delete) them.

9.  Intellectual Property

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; neither does it represent that it
   has made any effort to identify any such rights.  Information on the
   IETF's procedures with respect to rights in standards-track and
   standards-related documentation can be found in BCP-11.  Copies of
   claims of rights made available for publication and any assurances of
   licenses to be made available, or the result of an attempt made to
   obtain a general license or permission for the use of such
   proprietary rights by implementors or users of this specification can
   be obtained from the IETF Secretariat.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights which may cover technology that may be required to practice
   this standard.  Please address the information to the IETF Executive
   Director.

10.  Editor's Address

      Richard Woundy
      AT&T Broadband
      27 Industrial Avenue
      Chelmsford, MA 01824
      U.S.A.



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      Phone: +1 978 244 4010
      Email: rwoundy@broadband.att.com

11.  Full Copyright Statement

   Copyright (C) The Internet Society (2002). All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the  purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.
















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