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INTERNET-DRAFT                 SONET LINEAR APS MIB           J. Johnson
Expires April 9, 2003                                        M. Thatcher
                                                              J. Kuhfeld
                                                        Redback Networks
                                                         October 9, 2002



                     Definitions of Managed Objects
                   for SONET Linear APS architectures

                 draft-ietf-atommib-sonetaps-mib-09.txt



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 defines a portion of the Management Information Base (MIB)
   for use with network management protocols in TCP/IP based internets.
   In particular it defines objects for managing networks using SONET
   linear Automatic Protection Switching (APS) architectures.



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1. Introduction

   This memo defines a portion of the Management Information Base (MIB)
   used for managing SONET linear Automatic Protection Switching (APS)
   architectures. Two linear APS architectures are supported, the 1+1
   architecture and the 1:n architecture.


2. The SNMP Management Framework

   The SNMP Management Framework presently consists of five major
   components:

        An overall architecture, described in RFC 2571 [RFC2571].

        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 [RFC1155], STD 16, RFC 1212 [RFC1212] and RFC
        1215 [RFC1215].  The second version, called SMIv2, is described
        in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and
        STD 58, RFC 2580 [RFC2580].

        Message protocols for transferring management information.  The
        first version of the SNMP message protocol is called SNMPv1 and
        described in STD 15, RFC 1157 [RFC1157].  A second version of
        the SNMP message protocol, which is not an Internet standards
        track protocol, is called SNMPv2c and described in RFC 1901
        [RFC1901] and RFC 1906 [RFC1906].  The third version of the
        message protocol is called SNMPv3 and described in RFC 1906
        [RFC1906], RFC 2572 [RFC2572] and RFC 2574 [RFC2574].

        Protocol operations for accessing management information.  The
        first set of protocol operations and associated PDU formats is
        described in STD 15, RFC 1157 [RFC1157].  A second set of
        protocol operations and associated PDU formats is described in
        RFC 1905 [RFC1905].

        A set of fundamental applications described in RFC 2573
        [RFC2573] and the view-based access control mechanism described
        in RFC 2575 [RFC2575].

   A more detailed introduction to the current SNMP Management Framework
   can be found in RFC 2570 [RFC2570].

   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.



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   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.


3. Overview

   These objects are used to control and manage SONET linear APS
   architectures. Ring APS groups are not currently supported by this
   MIB.

   The MIB includes three scalars, containing counts of APS groups and
   SONET LTEs, a notification enable object, and six tables.

   The apsMapTable contains entries for each SONET LTE interface
   available on the system. The table serves two purposes. It can be
   used to locate SONET LTE interfaces that are not currently included
   in APS groups. It also provides a mapping from InterfaceIndex to
   group name and channel number for those SONET LTE interfaces that are
   included in APS groups.  Entries in apsMapTable cannot be added or
   deleted through operations defined in this MIB. However, an
   apsMapEntry may be added or deleted through other system mechanisms,
   such as hot swap. Also, existing entries cannot be directly modified
   and instead, such modifications occur as a result of side-effects of
   operations on the apsChanConfigTable.

   The apsChanConfigTable supports addition, modification and deletion
   of entries representing linear APS channels.  Entries are indexed by
   a text group name and integer channel number. Each entry contains an
   InterfaceIndex value identifying the SONET LTE used for the channel
   and the priority of the channel. A side effect of row creation or
   deletion is the setting of map entry fields. Creation of two or more
   entries in this table with a common group name index and consecutive
   channel numbers is the first step in the creation and configuration
   of an APS group. It is not necessary to create channel numbers in
   order; however, before an APS group is made active, the set of
   channels must begin with channel number 0 (for architectures other
   than onePlusOneOptimized) or channel number 1 (for the
   onePlusOneOptimized architecture) and must have consecutive channel
   numbers not exceeding 14. Note that the term null channel, which is
   used throughout this document, refers to the protection line.




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   The apsConfigTable supports addition, modification, and deletion of
   entries representing linear APS groups. Entries are indexed by a text
   group name. Each entry contains parameters that specify the
   configuration of a particular linear APS group. Entries are created
   in this table after a set of channels are created in the
   apsChanConfigTable. To successfully set an instance of
   apsConfigRowStatus to active the apsConfigEntry must contain valid
   values and all associated apsChanConfigEntry rows must be valid and
   produce a consecutive set of channels beginning with channel number 0
   or 1, depending on the selected architecture.

   The apsCommandTable provides linear APS commands that support
   protection switching and the ability to modify APS operation.
   Entries in this table are created as a side effect of setting the
   associated apsConfigRowStatus object to active. Entries in this table
   are deleted if the associated apsConfigRowStatus object is set to any
   value except active.

   The apsChanStatusTable provides individual channel statistics.

   The apsStatusTable provides group level statistics.

   An APS group is created and configured with the following sequence of
   events:

   CHANNEL CONFIGURATION

   Create an entry in the apsChanConfigTable.  Set the
   apsChanConfigGroupName in an apsChanConfigEntry to a user-friendly
   text string which will serve as the APS group name. The string must
   not be equal to the apsConfigName of an existing apsConfigEntry with
   apsConfigRowStatus set to active, since a channel cannot be added to
   an active group. The string may be set equal to the apsConfigName of
   a row which is currently not set to active, or it may be set to a
   string which does not currently exist in any instance of
   apsConfigName.  A channel number is entered in apsChanConfigNumber.
   A channel priority is entered in apsChanConfigPriority, if the
   intended architecture is 1:n. apsChanConfigPriority is ignored if the
   architecture is 1+1. The InterfaceIndex value of a SONET LTE
   interface is entered in apsChanConfigIfIndex.

   This step is repeated for all apsChanConfigEntry instances which are
   to be included in the APS group.

   ACTIVATING THE GROUP

   If the apsChanConfigGroupName does not exist in an instance of
   apsConfigName, an apsConfigEntry is created with the



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   apsChanConfigGroupName value used as the index for the row.  The
   apsConfigRowStatus value may be set to createAndGo.  The
   apsGroupConfigEntry and apsChanConfigEntry instances with matching
   name fields will be checked for consistency.  If any errors in the
   channel numbers, architecture or configuration are uncovered the
   apsConfigRowStatus set will return inconsistentValue, otherwise
   noError is returned.

   If the apsChanConfigGroupName value used in channel configuration
   exists in a previously created, inactive apsConfigEntry instance, the
   apsConfigRowStatus value may be set to active.

   An agent is not required to process SNMP Set Requests that affect
   multiple control objects within this MIB. This is intended to
   simplify the processing of Set Requests for the various control
   tables by eliminating the possibility that a single Set PDU will
   contain multiple varbinds which are in conflict, such as a PDU which
   both activates a given apsConfigEntry while at the same time it
   deactivates an associated apsChanConfigEntry.


4. Definitions

   APS-MIB DEFINITIONS ::= BEGIN

   IMPORTS
           MODULE-IDENTITY, NOTIFICATION-TYPE, OBJECT-TYPE,
           Gauge32, Counter32, Integer32, transmission
                   FROM SNMPv2-SMI

           TEXTUAL-CONVENTION, RowStatus,
           TimeStamp, StorageType
                   FROM SNMPv2-TC

           SnmpAdminString
                   FROM SNMP-FRAMEWORK-MIB

           ifIndex, InterfaceIndex
                   FROM IF-MIB

           MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP
                   FROM SNMPv2-CONF;

   apsMIB MODULE-IDENTITY
       LAST-UPDATED        "200205082300Z"  -- May 8, 2002
       ORGANIZATION        "IETF AToMMIB Working Group"
       CONTACT-INFO
           "       Jeff Johnson



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                   Postal: RedBack Networks. Inc.
                   300 Holger Way
                   San Jose, CA 95134-1362
                   Tel: +1 408 750 5460
                   Email: jeff@redback.com

                   Michael Thatcher
                   Postal: RedBack Networks. Inc.
                   300 Holger Way
                   San Jose, CA 95134-1362
                   Tel: +1 408 750 5449
                   Email: thatcher@redback.com

                   Jim Kuhfeld
                   Postal: RedBack Networks. Inc.
                   300 Holger Way
                   San Jose, CA 95134-1362
                   Tel: +1 408 750 5465
                   Email: jkuhfeld@redback.com"
       DESCRIPTION
           "This management information module supports the configuration
            and management of SONET linear APS groups. The definitions and
            descriptions used in this MIB have been derived from
            Synchronous Optical Network (SONET) Transport Systems:
            Common Generic Criteria, GR-253-CORE Issue 3, September 2000,
            section 5.3. The MIB is also consistent with the Multiplex
            Section Protection (MSP) protocol as specified in ITU-T
            Recommendation G.783, Characteristics of synchronous digital
            hierarchy (SDH) equipment function blocks, Annex A and B. "
       REVISION      "200205082300Z"  -- May 8, 2002
       DESCRIPTION
           "Initial version of this MIB, published as RFC xxxx."
       -- xxxx to be assigned by RFC-Editor
           ::= { transmission XX }
   -- XX TBA by IANA
   -- remove this notice from the MIB




   apsMIBObjects OBJECT IDENTIFIER
           ::= { apsMIB 1 }

   apsMIBNotifications OBJECT IDENTIFIER
           ::= { apsMIB 2 }

   apsMIBConformance OBJECT IDENTIFIER
           ::= { apsMIB 3 }



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   ApsK1K2 ::= TEXTUAL-CONVENTION
       STATUS current
       DESCRIPTION
           "This Textual Convention describes an object that stores
            a SONET K1 and K2 byte APS protocol field.

            K1 is located in the first octet, K2 is located in
            the second octet. Bits are numbered from left to right.

            Bits 1-4 of the K1 byte indicate a request.

            1111  Lockout of Protection
            1110  Forced Switch
            1101  SF - High Priority
            1100  SF - Low Priority
            1011  SD - High Priority
            1010  SD - Low Priority
            1001  not used
            1000  Manual Switch
            0111  not used
            0110  Wait-to-Restore
            0101  not used
            0100  Exercise
            0011  not used
            0010  Reverse Request
            0001  Do Not Revert
            0000  No Request

            Bits 5-8 of the K1 byte indicate the channel associated with the
            request defined in bits 1-4.

            0000 is the Null channel.

            1-14 are working channels.
            15   is the extra traffic channel

            Bits 1-4 of the K2 byte indicate a channel. The channel is
            defined with the same syntax as K1 Bits 5-8.

            Bit 5 of the K2 byte indicates the
            architecture.

            0 if the architecture is 1+1
            1 if the architecture is 1:n

            Bits 6-8 of the K2 byte indicates the mode.

            000 - 011 are reserved for future use



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            100  indicates the mode is unidirectional
            101  indicates the mode is bidirectional
            110  RDI-L
            111  AIS-L
           "
       REFERENCE
           "Bellcore (Telcordia Technologies) GR-253-CORE, Issue 3,
           September 2000, 5.3.5."
       SYNTAX      OCTET STRING (SIZE (2))


   ApsSwitchCommand ::= TEXTUAL-CONVENTION
       STATUS       current
       DESCRIPTION
           "An APS switch command allows a user to perform protection
            switch actions.

            If the APS switch command cannot be executed because an
            equal or higer priority request is in effect, an
            inconsistentValue error is returned.

            The Switch command values are:

            noCmd

            This value should be returned by a read request when no switch
            command has been written to the object in question since
            initialization. This value may not be used in a write operation.
            If noCmd is used in a write operation a wrongValue error is
            returned.

            clear

            Clears all of the switch commands listed below for the specified
            channel.

            lockoutOfProtection

            Prevents any of the working channels from switching to the protection
            line. The specified channel should be the protection channel,
            otherwise an inconsistentValue error is returned.

            forcedSwitchWorkToProtect

            Switches the specified working channel to the protection line.
            If the protection channel is specified an inconsistentValue
            error is returned.




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            forcedSwitchProtectToWork

            Switches the working channel back from the protection
            line to the working line. The specified channel should be
            the protection channel, otherwise an inconsistentValue
            error is returned.

            manualSwitchWorkToProtect

            Switches the specified working channel to the protection line.
            If the protection channel is specified an inconsistentValue
            error is returned.

            manualSwitchProtectToWork

            Switches the working channel back from the protection
            line to the working line. The specified channel should be
            the protection channel, otherwise an inconsistentValue
            error is returned.

            exercise

            Exercises the protocol for a protection switch of the specified
            channel by issuing an Exercise request for that channel and
            checking the response on the APS channel. "
       SYNTAX       INTEGER {
                        noCmd(1),
                        clear(2),
                        lockoutOfProtection(3),
                        forcedSwitchWorkToProtect(4),
                        forcedSwitchProtectToWork(5),
                        manualSwitchWorkToProtect(6),
                        manualSwitchProtectToWork(7),
                        exercise(8)
                    }

   ApsControlCommand ::= TEXTUAL-CONVENTION
       STATUS       current
       DESCRIPTION
           "An APS control command applies only to LTE that support the
            1:n architecture and performs the following actions.

            The Control command values are:

            noCmd

            This value should be returned by a read request when no control
            command has been written to the object in question since



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            initialization. This value may not be used in a write operation.
            If noCmd is used in a write operation a wrongValue error is
            returned.

            lockoutWorkingChannel

            Prevents the specified working channel from switching to the
            protection line. If the protection line is specified an
            inconsistentValue error is returned.

            clearLockoutWorkingChannel

            Clears the lockout a working channel command for the channel
            specified. If the protection line is specified an
            inconsistentValue error is returned."
       SYNTAX       INTEGER {
                        noCmd(1),
                        lockoutWorkingChannel(2),
                        clearLockoutWorkingChannel(3)
                    }


   --
   -- APS Configuration Table
   --
   -- This table supports the addition, configuration and deletion of APS
   -- groups.
   --

   apsConfig     OBJECT IDENTIFIER ::= { apsMIBObjects 1 }

   apsConfigGroups OBJECT-TYPE
       SYNTAX      Gauge32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The count of APS groups. This count includes all rows in
            apsConfigTable, regardless of the value of apsConfigRowStatus."
       ::= { apsConfig 1 }


   apsConfigTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF ApsConfigEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table lists the APS groups that have been configured
            on the system."



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       ::= { apsConfig 2 }

   apsConfigEntry OBJECT-TYPE
       SYNTAX      ApsConfigEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "A conceptual row in the apsConfigTable."
       INDEX { IMPLIED apsConfigName }
       ::= { apsConfigTable  1 }

   ApsConfigEntry ::= SEQUENCE {
       apsConfigName                  SnmpAdminString,
       apsConfigRowStatus             RowStatus,
       apsConfigMode                  INTEGER,
       apsConfigRevert                INTEGER,
       apsConfigDirection             INTEGER,
       apsConfigExtraTraffic          INTEGER,
       apsConfigSdBerThreshold        Integer32,
       apsConfigSfBerThreshold        Integer32,
       apsConfigWaitToRestore         Integer32,
       apsConfigCreationTime          TimeStamp,
       apsConfigStorageType           StorageType
   }

   apsConfigName OBJECT-TYPE
       SYNTAX      SnmpAdminString (SIZE (1..32))
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "A textual name for the APS group."
       ::= { apsConfigEntry 1 }

   apsConfigRowStatus OBJECT-TYPE
       SYNTAX      RowStatus
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
           "The status of this APS group entry.

           An entry may not exist in the active state unless all
           objects in the entry have an appropriate value. Also,
           all associated apsChanConfigEntry rows must represent
           a set of consecutive channel numbers beginning with
           0 or 1, depending on the selected architecture.

           When set to notInService changes may be made to apsConfigMode,
           apsConfigRevert, apsConfigDirection, apsConfigExtraTraffic,



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           apsConfigSdBerThreshold, apsConfigSfBerThreshold,
           and apsConfigWaitToRestore. Also, associated apsChanConfigTable
           objects may be added, deleted and modified."
       ::= { apsConfigEntry 2 }

   apsConfigMode OBJECT-TYPE
       SYNTAX      INTEGER {
                           onePlusOne(1),
                           oneToN(2),
                           onePlusOneCompatible(3),
                           onePlusOneOptimized(4)
                           }
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
          "The architecture of the APS group.

           onePlusOne

           The 1+1 architecture permanently bridges the working
           line to the protection line.

           oneToN

           The 1:n architecture allows one protection channel to
           protect up to n working channels. When a fault is detected
           on one of the n working channels that channel is bridged
           over the protection channel.

           onePlusOneCompatible

           This refers to 1 + 1 bidirectional switching compatible with
           1:n bidirectional switching as specified in ITU-T
           Recommendation G.783 (04/97) section A.3.4.1. Since this
           mode necessitates bidirectional switching, apsConfigDirection
           must be set to bidirectional whenever onePlusOneCompatible is set.

           onePlusOneOptimized

           This refers to 1 + 1 bidirectional switching optimized
           for a network using predominantly 1 + 1 bidirectional
           switching as specified in ITU-T Recommendation G.783 (04/97)
           section B.1. Since this mode necessitates bidirectional
           switching, apsConfigDirection must be set to bidirectional
           whenever onePlusOneOptimized is set.

           This object may not be modified if the associated
           apsConfigRowStatus object is equal to active(1)."



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       DEFVAL {onePlusOne}
       ::= { apsConfigEntry 3 }

   apsConfigRevert OBJECT-TYPE
       SYNTAX      INTEGER { nonrevertive(1), revertive(2) }
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
          "The revertive mode of the APS group.

           nonrevertive

           Traffic remains on the protection line until another switch
           request is received.

           revertive

           When the condition that caused a switch to the protection
           line has been cleared the signal is switched back to the
           working line. Since switching is revertive with the 1:n
           architecture, apsConfigRevert must be set to revertive if
           apsConfigMode is set to oneToN.

           Switching may optionally be revertive with the 1+1 architecture.

           This object may not be modified if the associated
           apsConfigRowStatus object is equal to active(1). "
       DEFVAL { nonrevertive }
       ::= { apsConfigEntry 4 }


   apsConfigDirection OBJECT-TYPE
       SYNTAX      INTEGER { unidirectional(1), bidirectional(2) }
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
          "The directional mode of the APS group.

           unidirectional

           The unidirectional mode provides protection in one direction.

           bidirectional

           The bidirectional mode provides protection in both
           directions.

           This object may not be modified if the associated



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           apsConfigRowStatus object is equal to active(1). "
       DEFVAL {unidirectional}
       ::= { apsConfigEntry 5 }


   apsConfigExtraTraffic OBJECT-TYPE
       SYNTAX      INTEGER { enabled(1), disabled(2) }
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
          "This object enables or disables the transfer of extra traffic
           on the protection channel in a 1:n architecture. This object
           must be set to disabled if the architecture is 1+1. It may be
           necessary to disable this in order to interwork with other SONET
           network elements that don't support extra traffic.

           This object may not be modified if the associated
           apsConfigRowStatus object is equal to active(1). "
       DEFVAL { disabled }
       ::= { apsConfigEntry 6 }


   apsConfigSdBerThreshold OBJECT-TYPE
       SYNTAX      Integer32 (5..9)
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
           "The Signal Degrade Bit Error Rate.

            The negated value of this number is used as the exponent of
            10 for computing the threshold value for the Bit Error Rate
            (BER). For example, a value of 5 indicates a BER threshold of
            10^-5.

            This object may be modified if the associated
            apsConfigRowStatus object is equal to active(1)."
       DEFVAL { 5 }
       ::= { apsConfigEntry 7 }


   apsConfigSfBerThreshold OBJECT-TYPE
       SYNTAX      Integer32 (3..5)
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
           "The Signal Failure Bit Error Rate.

            The negated value of this number is used as the exponent of



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            10 for computing the threshold value for the Bit Error Rate
            (BER). For example, a value of 5 indicates a BER threshold of
            10^-5.

            This object may be modified if the associated
            apsConfigRowStatus object is equal to active(1)."
       DEFVAL { 3 }
       ::= { apsConfigEntry 8 }

   apsConfigWaitToRestore OBJECT-TYPE
       SYNTAX      Integer32 (0..720)
       UNITS       "seconds"
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
           "The Wait To Restore period in seconds.

            After clearing of a condition that necessitated an
            automatic switch, the wait to restore period must elapse
            before reverting. This is intended to avoid rapid switch
            oscillations.

            GR-253-CORE specifies a Wait To Restore range of 5 to 12
            minutes. G.783 defines a 5 to 12 minute Wait To Restore
            range in section 5.4.1.1.3, but also allows for a shorter
            WTR period in  Table 2-1,
            WaitToRestore value (MI_WTRtime: 0..(5)..12 minutes).

            This object may not be modified if the associated
            apsConfigRowStatus object is equal to active(1)."
       DEFVAL { 300 }
       ::= { apsConfigEntry 9 }

   apsConfigCreationTime OBJECT-TYPE
       SYNTAX      TimeStamp
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The value of sysUpTime at the time the row was
            created"
       ::= { apsConfigEntry 10 }

   apsConfigStorageType OBJECT-TYPE
       SYNTAX      StorageType
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
           "The storage type for this conceptual row.



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            Conceptual rows having the value 'permanent' need not
            allow write-access to any columnar objects in the row."
       DEFVAL      { nonVolatile }
       ::= { apsConfigEntry 11 }

   --
   -- APS Status Table
   --
   -- This table provides APS group statistics.
   --


   apsStatusTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF ApsStatusEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table provides status information about APS groups that have
            been configured on the system."
       ::= { apsMIBObjects 2 }

   apsStatusEntry OBJECT-TYPE
       SYNTAX      ApsStatusEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "A conceptual row in the apsStatusTable."
       AUGMENTS { apsConfigEntry }
       ::= { apsStatusTable  1 }

   ApsStatusEntry ::= SEQUENCE {
       apsStatusK1K2Rcv               ApsK1K2,
       apsStatusK1K2Trans             ApsK1K2,
       apsStatusCurrent               BITS,
       apsStatusModeMismatches        Counter32,
       apsStatusChannelMismatches     Counter32,
       apsStatusPSBFs                 Counter32,
       apsStatusFEPLFs                Counter32,
       apsStatusSwitchedChannel       Integer32,
       apsStatusDiscontinuityTime     TimeStamp
   }

   apsStatusK1K2Rcv OBJECT-TYPE
       SYNTAX      ApsK1K2
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The current value of the K1 and K2 bytes received on the



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            protection channel."
       ::= { apsStatusEntry 1 }

   apsStatusK1K2Trans OBJECT-TYPE
       SYNTAX        ApsK1K2
       MAX-ACCESS    read-only
       STATUS        current
       DESCRIPTION
           "The current value of the K1 and K2 bytes transmitted on the
            protection channel."
       ::= { apsStatusEntry 2 }

   apsStatusCurrent OBJECT-TYPE
       SYNTAX      BITS {
                     modeMismatch(0),
                     channelMismatch(1),
                     psbf(2),
                     feplf(3),
                     extraTraffic(4)
                    }
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The current status of the APS group.

            modeMismatch

            Modes other than 1+1 unidirectional monitor protection line
            K2 bit 5, which indicates the architecture and K2 bits
            6-8, which indicate if the mode is unidirectional or
            bidirectional. A conflict between the current local mode
            and the received K2 mode information constitutes a
            mode mismatch.

            channelMismatch

            This bit indicates a  mismatch between the transmitted K1 channel
            and the received K2 channel has been detected.

            psbf

            This bit indicates a Protection Switch Byte Failure (PSBF) is
            in effect. This condition occurs when either an inconsistent
            APS byte or an invalid code is detected. An inconsistent APS
            byte occurs when no three consecutive K1 bytes of the last 12
            successive frames are identical, starting with the last frame
            containing a previously consistent byte. An invalid code occurs
            when the incoming K1 byte contains an unused code or a code



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            irrelevant for the specific switching operation (e.g., Reverse
            Request while no switching request is outstanding) in three
            consecutive frames. An invalid code also occurs when the incoming
            K1 byte contains an invalid channel number in three consecutive
            frames.

            feplf

            Modes other than 1+1 unidirectional monitor the K1 byte
            for Far-End Protection-Line failures. A Far-End
            Protection-Line defect is declared based on receiving
            SF on the protection line.

            extraTraffic

            This bit indicates whether extra traffic is currently being
            accepted on the protection line. "
       ::= { apsStatusEntry 3 }

   apsStatusModeMismatches OBJECT-TYPE
       SYNTAX     Counter32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
           "A count of Mode Mismatch conditions.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            apsStatusDiscontinuityTime."
       ::= { apsStatusEntry 4 }

   apsStatusChannelMismatches OBJECT-TYPE
       SYNTAX     Counter32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
           "A count of Channel Mismatch conditions.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            apsStatusDiscontinuityTime."
       ::= { apsStatusEntry 5 }

   apsStatusPSBFs OBJECT-TYPE
       SYNTAX     Counter32
       MAX-ACCESS read-only



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       STATUS     current
       DESCRIPTION
           "A count of Protection Switch Byte Failure conditions.
            This condition occurs when either an inconsistent APS
            byte or an invalid code is detected. An inconsistent APS
            byte occurs when no three consecutive K1 bytes of the last
            12 successive frames are identical, starting with the last
            frame containing a previously consistent byte. An invalid
            code occurs when the incoming K1 byte contains an unused
            code or a code irrelevant for the specific switching operation
            (e.g., Reverse Request while no switching request is outstanding)
            in three consecutive frames. An invalid code also occurs
            when the incoming K1 byte contains an invalid channel number
            in three consecutive frames.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            apsStatusDiscontinuityTime."
       ::= { apsStatusEntry 6 }

   apsStatusFEPLFs OBJECT-TYPE
       SYNTAX     Counter32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
           "A count of Far-End Protection-Line Failure conditions.
            This condition is declared based on receiving SF on
            the protection line in the K1 byte.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            apsStatusDiscontinuityTime."
       ::= { apsStatusEntry 7 }

   apsStatusSwitchedChannel OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
           "This field is set to the number of the channel that is currently
            switched to protection. The value 0 indicates no channel is
            switched to protection. The values 1-14 indicate that working
            channel is switched to protection."
       ::= { apsStatusEntry 8 }

   apsStatusDiscontinuityTime OBJECT-TYPE



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       SYNTAX      TimeStamp
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The value of sysUpTime on the most recent occasion at which
            any one or more of this APS group's counters suffered a
            discontinuity.  The relevant counters are the specific
            instances associated with this APS group of any Counter32
            object contained in apsStatusTable. If no such
            discontinuities have occurred since the last re-initialization
            of the local management subsystem, then this object contains
            a zero value."
       ::= { apsStatusEntry 9 }

   --
   -- APS Map Group
   --
   -- Lists the SONET LTE interfaces that may be used to create APS groups.
   --

   apsMap      OBJECT IDENTIFIER ::= { apsMIBObjects 3 }

   apsChanLTEs OBJECT-TYPE
       SYNTAX      Gauge32
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The count of SONET LTE interfaces on the system.
            Each interface that is included has an ifType value of sonet(39)."
       ::= { apsMap 1 }

   apsMapTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF ApsMapEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table lists the SONET LTE interfaces on the system.
            Each interface that is listed has an ifType value of sonet(39)."
       ::= { apsMap 2 }

   apsMapEntry OBJECT-TYPE
       SYNTAX      ApsMapEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "A conceptual row in the apsMapTable."
       INDEX { ifIndex }
       ::= { apsMapTable  1 }



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   ApsMapEntry ::= SEQUENCE {
       apsMapGroupName             SnmpAdminString,
       apsMapChanNumber            Integer32
   }

   apsMapGroupName OBJECT-TYPE
       SYNTAX      SnmpAdminString (SIZE (0..32))
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "A textual name for the APS group which this channel is
            included in. If the channel is not part of an APS group
            this value is set to a string of size 0.

            When an instance of apsChanConfigIfIndex is set equal to an
            instance of ifIndex that has an  ifType value of sonet(39),
            apsMapGroupName is set equal to the corresponding value of
            apsChanConfigGroupName.

            If an instance of ifIndex that has an  ifType value of sonet(39)
            ceases to be equal to an instance of apsChanConfigIfIndex, either
            because of a change in the value of apsChanConfigIfIndex, or
            because of row deletion in the ApsChanConfigTable, apsMapGroupName
            is set to a string of size 0."
       ::= { apsMapEntry 2 }

   apsMapChanNumber OBJECT-TYPE
       SYNTAX     Integer32 (-1..14)
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
           "This field is set to a unique channel number within an APS group.
            The value 0 indicates the null channel. The values 1-14 define a
            working channel. If the SONET LTE is not part of an APS group this
            value is set to -1.

            When an instance of apsChanConfigIfIndex is set equal to an
            instance of ifIndex that has an  ifType value of sonet(39),
            apsMapChanNumber is set equal to the corresponding value of
            apsChanConfigNumber.

            If an instance of ifIndex that has an  ifType value of sonet(39)
            ceases to be equal to an instance of apsChanConfigIfIndex, either
            because of a change in the value of apsChanConfigIfIndex, or
            because of row deletion in the ApsChanConfigTable,
            apsMapChanNumber is set to -1."
       ::= { apsMapEntry 3 }




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   --
   -- APS Channel Configuration Table
   --
   -- This table supports the addition, configuration and deletion of channels
   -- in APS groups.
   --

   apsChanConfigTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF ApsChanConfigEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table lists the APS channels that have been configured
            in APS groups."
       ::= { apsMIBObjects 4 }

   apsChanConfigEntry OBJECT-TYPE
       SYNTAX      ApsChanConfigEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "A conceptual row in the apsChanConfigTable."
       INDEX {apsChanConfigGroupName, apsChanConfigNumber}
       ::= { apsChanConfigTable  1 }

   ApsChanConfigEntry ::= SEQUENCE {
       apsChanConfigGroupName             SnmpAdminString,
       apsChanConfigNumber                Integer32,
       apsChanConfigRowStatus             RowStatus,
       apsChanConfigIfIndex               InterfaceIndex,
       apsChanConfigPriority              INTEGER,
       apsChanConfigStorageType           StorageType
   }

   apsChanConfigGroupName OBJECT-TYPE
       SYNTAX      SnmpAdminString (SIZE (1..32))
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "A textual name for the APS group which this channel is
            included in."
       ::= { apsChanConfigEntry 1 }

   apsChanConfigNumber OBJECT-TYPE
       SYNTAX     Integer32 (0..14)
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION



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           "This field is set to a unique channel number within an APS group.
            The value 0 indicates the null channel. The values 1-14 define a
            working channel.

            This field must be assigned a unique number within the group."
       ::= { apsChanConfigEntry 2 }

   apsChanConfigRowStatus OBJECT-TYPE
       SYNTAX      RowStatus
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION
           "The status of this APS channel entry.

            An entry may not exist in the active state unless all
            objects in the entry have an appropriate value.

            A row in the apsChanConfigTable may not be created,
            deleted, set to notInService or otherwise modified
            if the apsChanConfigGroupName value is equal to an
            apsConfigName value and the associated apsConfigRowStatus
            object is equal to active. However, if the apsConfigRowStatus
            object is equal to notInService, a row may be created, deleted
            or modified. In other words, a channel may not be added, deleted
            or modified if the group is active.

            A row may be created with an apsChanConfigGroupName value
            that is not equal to any existing instance of apsConfigName.
            This action is the initial step in adding a SONET LTE to a
            new APS group.

            If this object is set to destroy, the associated instance
            of apsMapGroupName will be set to a string of size 0 and
            the apsMapChanNumber will be set to -1. The channel status
            entry will also be deleted by this action.

            apsChanConfigNumber must be set to a unique channel number within
            the APS group. The value 0 indicates the null channel.
            The values 1-14 define a working channel. When an attempt is
            made to set the  corresponding apsConfigRowStatus field to
            active the apsChanConfigNumber values of all entries with equal
            apsChanConfigGroupName fields must represent a set of consecutive
            integer values beginning with 0 or 1, depending on the architecture
            of the group, and ending with n, where n is  greater than or
            equal to 1 and less than or equal to 14. Otherwise, the error
            inconsistentValue is returned to the apsConfigRowStatus
            set attempt."
       ::= { apsChanConfigEntry 3 }



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   apsChanConfigIfIndex OBJECT-TYPE
       SYNTAX     InterfaceIndex
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
           "The Interface Index assigned to a SONET LTE. This is an
            interface with ifType sonet(39). The value of this object
            must be unique among all instances of apsChanConfigIfIndex.
            In other words, a particular SONET LTE can only be configured in
            one APS group.

            This object cannot be set if the apsChanConfigGroupName instance
            associated with this row is equal to an instance of apsConfigName
            and the corresponding apsConfigRowStatus object is set to active.
            In other words this value cannot be changed if the APS group is
            active. However, this value may be changed if the apsConfigRowStatus
            value is equal to notInService."
       ::= { apsChanConfigEntry 4 }

   apsChanConfigPriority OBJECT-TYPE
       SYNTAX     INTEGER {low(1), high(2)}
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
           "The priority of the channel.

            This field deterimines whether high or low priority
            SD and SF codes are used in K1 requests.

            This field is only applicable if the channel is to be included in
            a group using the 1:n architecture. It is not applicable if the
            channel is to be included in a group using the 1+1 architecture,
            and is ignored in that case.

            This object cannot be set if the apsChanConfigGroupName instance
            associated with this row is equal to an instance of apsConfigName
            and the corresponding apsConfigRowStatus object is set to active.
            In other words this value cannot be changed if the APS group is
            active. However, this value may be changed if the
            apsConfigRowStatus value is equal to notInService."
       DEFVAL { low }
       ::= { apsChanConfigEntry 5 }

   apsChanConfigStorageType OBJECT-TYPE
       SYNTAX      StorageType
       MAX-ACCESS  read-create
       STATUS      current
       DESCRIPTION



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           "The storage type for this conceptual row.
            Conceptual rows having the value 'permanent' need not
            allow write-access to any columnar objects in the row."
       DEFVAL { nonVolatile }
       ::= { apsChanConfigEntry 6 }

   --
   -- APS Command Table
   --
   -- This table provides the ability to initiate APS commands.
   --

   apsCommandTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF ApsCommandEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table allows commands to be sent to configured APS groups."
       ::= { apsMIBObjects 5 }

   apsCommandEntry OBJECT-TYPE
       SYNTAX      ApsCommandEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "A conceptual row in the apsCommandTable. This row exists only if
            the associated apsConfigEntry is active."
       INDEX {apsChanConfigGroupName, apsChanConfigNumber}
       ::= { apsCommandTable  1 }

   ApsCommandEntry ::= SEQUENCE {
       apsCommandSwitch         ApsSwitchCommand,
       apsCommandControl        ApsControlCommand
   }

   apsCommandSwitch OBJECT-TYPE
       SYNTAX      ApsSwitchCommand
       MAX-ACCESS  read-write
       STATUS      current
       DESCRIPTION
           "Allows the initiation of an APS switch command on the
            APS group and channel specified by the index values.

            When read this object returns the last command written
            or noCmd if no command has been written to this
            channel since initialization. The return of the last command
            written does not imply that this command is currently in effect.
            This request may have been preempted by a higher priority



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            local or remote request. In order to determine the
            current state of the APS group it is necessary to read
            the objects apsStatusK1K2Rcv and apsStatusK1K2Trans.

            The value lockoutOfProtection should only be applied to the
            protection line channel since that switch command prevents any of
            the working channels from switching to the protection line.
            Following the same logic, forcedSwitchProtectToWork and
            manualSwitchProtectToWork should only be applied to the protection
            line channel.

            forcedSwitchWorkToProtect and manualSwitchWorkToProtect
            should only be applied to a working channel."
       ::= { apsCommandEntry 1 }

   apsCommandControl OBJECT-TYPE
       SYNTAX      ApsControlCommand
       MAX-ACCESS  read-write
       STATUS      current
       DESCRIPTION
           "Allows the initiation of an APS control command on the
            APS group and channel specified by the index values.

            When read this object returns the last command written or
            noCmd if no command has been written to this channel since
            initialization.

            This object does not apply to the protection line."
       ::= { apsCommandEntry 2 }

   --
   -- APS Channel Status Table
   --
   -- This table provides APS channel statistics.
   --

   apsChanStatusTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF ApsChanStatusEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table contains status information for all SONET LTE
            interfaces that are included in APS groups."
       ::= { apsMIBObjects 6 }

   apsChanStatusEntry OBJECT-TYPE
       SYNTAX      ApsChanStatusEntry
       MAX-ACCESS  not-accessible



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       STATUS      current
       DESCRIPTION
           "A conceptual row in the apsChanStatusTable."
       AUGMENTS { apsChanConfigEntry }
       ::= { apsChanStatusTable  1 }

   ApsChanStatusEntry ::= SEQUENCE {
       apsChanStatusCurrent                BITS,
       apsChanStatusSignalDegrades        Counter32,
       apsChanStatusSignalFailures        Counter32,
       apsChanStatusSwitchovers           Counter32,
       apsChanStatusLastSwitchover        TimeStamp,
       apsChanStatusSwitchoverSeconds     Counter32,
       apsChanStatusDiscontinuityTime     TimeStamp
   }

   apsChanStatusCurrent OBJECT-TYPE
       SYNTAX     BITS {
                  lockedOut(0),
                  sd(1),
                  sf(2),
                  switched(3),
                  wtr(4)
               }
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
           "Indicates the current state of the port.

            lockedOut

            This bit, when applied to a working channel, indicates that
            the channel is prevented from switching to the protection line.
            When applied to the null channel, this bit indicates that no
            working channel may switch to the protection line.

            sd

            A signal degrade condition is in effect.

            sf

            A signal failure condition is in effect.

            switched

            The switched bit is applied to a working channel if that
            channel is currently switched to the protection line.



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            wtr

            A Wait-to-Restore state is in effect."
       ::= { apsChanStatusEntry 1 }


   apsChanStatusSignalDegrades OBJECT-TYPE
       SYNTAX     Counter32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
           "A count of Signal Degrade conditions. This condition
            occurs when the line Bit Error Rate exceeds the currently
            configured value of the relevant instance of
            apsConfigSdBerThreshold.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            apsChanStatusDiscontinuityTime."

       ::= { apsChanStatusEntry 2 }

   apsChanStatusSignalFailures OBJECT-TYPE
       SYNTAX     Counter32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
           "A count of Signal Failure conditions that have been
            detected on the incoming signal. This condition occurs
            when a loss of signal, loss of frame, AIS-L or a Line
            bit error rate exceeding the currently configured value of
            the relevant instance of apsConfigSfBerThreshold.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            apsChanStatusDiscontinuityTime."

       ::= { apsChanStatusEntry 3 }

   apsChanStatusSwitchovers OBJECT-TYPE
       SYNTAX     Counter32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
           "When queried with index value apsChanConfigNumber other than 0,
            this object will return the number of times this channel has



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            switched to the protection line.

            When queried with index value apsChanConfigNumber set to 0,
            which is the protection line, this object will return the
            number of times that any working channel has been switched
            back to the working line from this protection line.

            Discontinuities in the value of this counter can occur at
            re-initialization of the management system, and at other
            times as indicated by the value of
            apsChanStatusDiscontinuityTime."

       ::= { apsChanStatusEntry 4 }

   apsChanStatusLastSwitchover OBJECT-TYPE
       SYNTAX     TimeStamp
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
           "When queried with index value apsChanConfigNumber other than 0,
            this object will return the value of sysUpTime when this
            channel last completed a switch to the protection line. If this
            channel has never switched to the protection line, the value
            0 will be returned.

            When queried with index value apsChanConfigNumber set to 0,
            which is the protection line, this object will return the
            value of sysUpTime the last time that a working channel was
            switched back to the working line from this protection line.
            If no working channel has ever switched back to the working
            line from this protection line, the value 0 will be returned."
       ::= { apsChanStatusEntry 5 }

   apsChanStatusSwitchoverSeconds OBJECT-TYPE
       SYNTAX     Counter32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
           "The cumulative Protection Switching Duration (PSD) time in
            seconds. For a working channel, this is the cumulative number
            of seconds that service was carried on the protection line.
            For the protection line, this is the cumulative number of
            seconds that the protection line has been used to carry any
            working channel traffic. This information is only valid if
            revertive switching is enabled. The value 0 will be returned
            otherwise.

            Discontinuities in the value of this counter can occur at



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            re-initialization of the management system, and at other
            times as indicated by the value of
            apsChanStatusDiscontinuityTime. For example, if the value
            of an instance of apsChanStatusSwitchoverSeconds changes
            from a non-zero value to zero due to revertive switching
            being disabled, it is expected that the corresponding
            value of apsChanStatusDiscontinuityTime will be updated
            to reflect the time of the configuration change.
            "
       ::= { apsChanStatusEntry 6 }

   apsChanStatusDiscontinuityTime OBJECT-TYPE
       SYNTAX      TimeStamp
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The value of sysUpTime on the most recent occasion at which
            any one or more of this channel's counters suffered a
            discontinuity.  The relevant counters are the specific
            instances associated with this channel of any Counter32
            object contained in apsChanStatusTable. If no such
            discontinuities have occurred since the last re-initialization
            of the local management subsystem, then this object contains
            a zero value."
       ::= { apsChanStatusEntry 7 }

   apsNotificationEnable OBJECT-TYPE
       SYNTAX     BITS {
                  switchover(0),
                  modeMismatch(1),
                  channelMismatch(2),
                  psbf(3),
                  feplf(4)
               }
       MAX-ACCESS read-write
       STATUS     current
       DESCRIPTION
           "Provides the ability to enable and disable notifications
            defined in this MIB.

            switchover

            Indicates  apsEventSwitchover notifications
            should be generated.

            modeMismatch

            Indicates  apsEventModeMismatch notifications



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            should be generated.

            channelMismatch

            Indicates  apsEventChannelMismatch notifications
            should be generated.

            psbf

            Indicates  apsEventPSBF notifications
            should be generated.

            feplf

            Indicates  apsEventFEPLF notifications
            should be generated. "
       DEFVAL { { } }
       ::= { apsMIBObjects 7 }

   --
   -- APS EVENTS
   --

   apsNotificationsPrefix OBJECT IDENTIFIER
           ::= { apsMIBNotifications 0 }

   apsEventSwitchover NOTIFICATION-TYPE
       OBJECTS { apsChanStatusSwitchovers, apsChanStatusCurrent }
       STATUS  current
       DESCRIPTION
           "An apsEventSwitchover notification is sent when the
           value of an instance of apsChanStatusSwitchovers increments."
       ::= { apsNotificationsPrefix 1 }

   apsEventModeMismatch NOTIFICATION-TYPE
       OBJECTS { apsStatusModeMismatches, apsStatusCurrent }
       STATUS  current
       DESCRIPTION
           "An apsEventModeMismatch notification is sent when the
           value of an instance of apsStatusModeMismatches increments."
       ::= { apsNotificationsPrefix 2 }

   apsEventChannelMismatch NOTIFICATION-TYPE
       OBJECTS { apsStatusChannelMismatches, apsStatusCurrent }
       STATUS  current
       DESCRIPTION
           "An apsEventChannelMismatch notification is sent when the
           value of an instance of apsStatusChannelMismatches increments."



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       ::= { apsNotificationsPrefix 3 }

   apsEventPSBF NOTIFICATION-TYPE
       OBJECTS { apsStatusPSBFs, apsStatusCurrent }
       STATUS  current
       DESCRIPTION
           "An apsEventPSBF notification is sent when the
           value of an instance of apsStatusPSBFs increments."
       ::= { apsNotificationsPrefix 4 }

   apsEventFEPLF NOTIFICATION-TYPE
       OBJECTS { apsStatusFEPLFs, apsStatusCurrent }
       STATUS  current
       DESCRIPTION
           "An apsEventFEPLFs notification is sent when the
           value of an instance of apsStatusFEPLFs increments."
       ::= { apsNotificationsPrefix 5 }


   -- conformance information

   apsGroups      OBJECT IDENTIFIER ::= { apsMIBConformance 1 }
   apsCompliances OBJECT IDENTIFIER ::= { apsMIBConformance 2 }

   apsFullCompliance MODULE-COMPLIANCE
       STATUS  current
       DESCRIPTION
           "When this MIB is implemented with support for read-create, then
           such an implementation can claim read/write compliance. Linear APS
           groups can then be both monitored and configured with this MIB.

           Note that An agent is not required to process SNMP Set Requests that
           affect multiple control objects within this MIB. This is intended to
           simplify the processing of Set Requests for the various control
           tables by eliminating the possibility that a single Set PDU will
           contain multiple varbinds which are in conflict. "

       MODULE
       MANDATORY-GROUPS { apsConfigGeneral, apsStatusGeneral, apsChanGeneral }

           OBJECT  apsConfigRowStatus
           SYNTAX INTEGER { active(1) }
           WRITE-SYNTAX INTEGER { createAndGo(4), destroy(6) }
           DESCRIPTION
               "Support for createAndWait and notInService is not required."

           OBJECT  apsChanConfigRowStatus
           SYNTAX INTEGER { active(1) }



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           WRITE-SYNTAX INTEGER { createAndGo(4), destroy(6) }
           DESCRIPTION
               "Support for createAndWait and notInService is not required."

           GROUP       apsConfigWtr
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations. The information is
                applicable to groups supporting a configurable
                WTR period."

           GROUP       apsCommandOnePlusOne
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations. The information is
                applicable to groups implementing the linear
                APS 1+1 architecture and supporting set operations."

          GROUP       apsCommandOneToN
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations. The information is
                applicable to groups implementing the linear
                APS 1:n architecture and supporting set operations."

          GROUP       apsChanOneToN
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations. The information is
                applicable to groups implementing the linear
                APS 1:n architecture."

          GROUP       apsTotalsGroup
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations."

          GROUP       apsMapGroup
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations."

          GROUP       apsEventGroup
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations."

       ::= { apsCompliances 1 }



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   --
   -- Read-Only Compliance
   --

   apsReadOnlyCompliance MODULE-COMPLIANCE
       STATUS  current
       DESCRIPTION
           "When this MIB is implemented without support for read-create
            (i.e. in read-only mode), then that implementation can claim
            read-only compliance. In that case, linear APS groups can be
            monitored but cannot be configured with this MIB."

       MODULE
       MANDATORY-GROUPS { apsConfigGeneral, apsStatusGeneral, apsChanGeneral }

           OBJECT  apsConfigMode
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT  apsConfigRevert
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT  apsConfigDirection
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT  apsConfigExtraTraffic
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT  apsConfigSdBerThreshold
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT  apsConfigSfBerThreshold
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT  apsConfigWaitToRestore
           MIN-ACCESS  read-only
           DESCRIPTION



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               "Write access is not required."

           OBJECT  apsConfigRowStatus
           SYNTAX  INTEGER { active(1) }
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required, and active is the only status
                that needs to be supported."

           OBJECT  apsConfigStorageType
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT  apsChanConfigIfIndex
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT  apsChanConfigPriority
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT  apsChanConfigRowStatus
           SYNTAX  INTEGER { active(1) }
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required, and active is the only status
                that needs to be supported."

           OBJECT  apsChanConfigStorageType
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           OBJECT  apsNotificationEnable
           MIN-ACCESS  read-only
           DESCRIPTION
               "Write access is not required."

           GROUP       apsConfigWtr
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations. The information is
                applicable to groups supporting a configurable
                WTR period."




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           GROUP       apsCommandOnePlusOne
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations. The information is
                applicable to groups implementing the linear
                APS 1+1 architecture and supporting set operations."

          GROUP       apsCommandOneToN
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations. The information is
                applicable to groups implementing the linear
                APS 1:n architecture and supporting set operations."

          GROUP       apsChanOneToN
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations. The information is
                applicable to groups implementing the linear
                APS 1:n architecture."

          GROUP       apsTotalsGroup
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations."

          GROUP       apsMapGroup
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations."

          GROUP       apsEventGroup
           DESCRIPTION
               "Implementation of this group is optional for all
                linear APS implementations."

       ::= { apsCompliances 2 }

   -- units of conformance

   apsConfigGeneral    OBJECT-GROUP
       OBJECTS
       {
           apsConfigMode,
           apsConfigRevert,
           apsConfigDirection,
           apsConfigExtraTraffic,
           apsConfigSdBerThreshold,



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           apsConfigSfBerThreshold,
           apsConfigCreationTime,
           apsConfigRowStatus,
           apsConfigStorageType,
           apsNotificationEnable
       }
       STATUS  current
       DESCRIPTION
           "A collection of apsConfigTable objects providing configuration
            information applicable to all linear APS groups."
       ::= { apsGroups 1 }

   apsConfigWtr    OBJECT-GROUP
       OBJECTS
       {
           apsConfigWaitToRestore
       }
       STATUS  current
       DESCRIPTION
           "The apsConfigTable object that provides information which is
            applicable to groups supporting a configurable WTR period."
       ::= { apsGroups 2 }

   --  If set operations are not supported neither of the following two groups
   --  are implemented. If sets are supported only one of these groups is
   --  implemented for a linear APS group instance.

   apsCommandOnePlusOne    OBJECT-GROUP
       OBJECTS
       {
           apsCommandSwitch
       }
       STATUS  current
       DESCRIPTION
           "The  apsCommandTable object which is applicable to groups
            implementing the linear APS 1+1 architecture. Also, set operations
            must be supported."
       ::= { apsGroups 3 }

   apsCommandOneToN    OBJECT-GROUP
       OBJECTS
       {
           apsCommandSwitch,
           apsCommandControl
       }
       STATUS  current
       DESCRIPTION
           "A collection of apsCommandTable objects which are applicable to



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            groups implementing the linear APS 1:n architecture. Also, set
            operations must be supported."
       ::= { apsGroups 4 }


   apsStatusGeneral    OBJECT-GROUP
       OBJECTS
       {
           apsStatusK1K2Rcv,
           apsStatusK1K2Trans,
           apsStatusCurrent,
           apsStatusModeMismatches,
           apsStatusChannelMismatches,
           apsStatusPSBFs,
           apsStatusFEPLFs,
           apsStatusSwitchedChannel,
           apsStatusDiscontinuityTime
       }
       STATUS  current
       DESCRIPTION
           "A collection of apsStatusTable objects providing status information
            applicable to all linear APS groups."
       ::= { apsGroups 5 }

   apsChanGeneral    OBJECT-GROUP
       OBJECTS
       {
           apsChanConfigIfIndex,
           apsChanConfigRowStatus,
           apsChanConfigStorageType,
           apsChanStatusCurrent,
           apsChanStatusSignalDegrades,
           apsChanStatusSignalFailures,
           apsChanStatusSwitchovers,
           apsChanStatusLastSwitchover,
           apsChanStatusSwitchoverSeconds,
           apsChanStatusDiscontinuityTime
      }
       STATUS  current
       DESCRIPTION
           "A collection of channel objects providing information applicable to
            all linear APS channels."
       ::= { apsGroups 6 }

   apsChanOneToN    OBJECT-GROUP
       OBJECTS
       {
           apsChanConfigPriority



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       }
       STATUS  current
       DESCRIPTION
           "The apsChanConfigTable object that provides information which is only
            applicable to groups implementing the linear APS 1:n architecture."
       ::= { apsGroups 7 }

   apsTotalsGroup OBJECT-GROUP
       OBJECTS
       {
           apsConfigGroups,
           apsChanLTEs
       }
       STATUS  current
       DESCRIPTION
           "A collection of objects providing optional counts of configured APS
            groups and SONET LTE interfaces."
       ::= { apsGroups 8 }


   apsMapGroup OBJECT-GROUP
       OBJECTS
       {
           apsMapGroupName,
           apsMapChanNumber
       }
       STATUS  current
       DESCRIPTION
           "A collection of apsMapTable objects providing a mapping
            from sonet(39) InterfaceIndex to group name and channel
            number for assigned APS channels and a list of unassigned
            sonet(39) interfaces."
       ::= { apsGroups 9 }

   apsEventGroup NOTIFICATION-GROUP
       NOTIFICATIONS {apsEventSwitchover, apsEventModeMismatch,
                      apsEventChannelMismatch, apsEventPSBF,
                      apsEventFEPLF }
       STATUS    current
       DESCRIPTION
           "A collection of SONET linear APS notifications."
       ::= { apsGroups 10 }

   END



5. Intellectual Property



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   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.


6. Acknowledgments

   This document is a product of the AToMMIB Working Group. A number of
   constructs from a separate draft submission by Ken Chapman have been
   included here. Suggestions by Orly Nicklass, Faye Ly, Ron Carmona,
   Kaj Tesink, C. M. Heard, Muly Ilan, and Mickey Spiegel have been
   incorporated. A quality review was provided by Lauren Heintz
   and an IESG review by John Flick and Bert Wijnen.


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., Schoenwaelder, J., Case, J., Rose,
        M. and S. Waldbusser, "Structure of Management Information
        Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.

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



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   [7]  McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose,
        M. and S. Waldbusser, "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.

   [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] Case, J., Mundy, R., Partain, D. and B. Stewart, "Introduction
        to Version 3 of the Internet-standard Network Management
        Framework", RFC 2570, April 1999.

   [17] McCloghrie, K., and F. Kastenholz.  "The Interfaces Group MIB",
        RFC 2863, June 2000.

   [18] GR-253-CORE Issue 3, September 2000

   [19] ITU-T Recommendation G.783 (04/97)

   [20] K. Chapman, "Definitions of Managed Objects for SONET Linear
        Automatic Protection Switching (APS)",
        draft-kchapman-sonet-aps-00.txt, July 1999




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8.Security Considerations

   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 particular, the APS command
   objects apsCommandSwitch and apsCommandControl and the APS configuration
   objects apsConfigRowStatus, apsConfigMode, apsConfigRevert,
   apsConfigDirection, apsConfigExtraTraffic, apsConfigSdBerThreshold,
   apsConfigSfBerThreshold, apsConfigWaitToRestore, apsConfigStorageType,
   apsChanConfigRowStatus, apsChanConfigIfIndex, apsChanConfigPriority,
   apsChanConfigStorageType and apsNotificationEnable have the potential
   of disrupting APS  operations if set operations are performed with
   malicious intent.

   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 RFC 2574 [RFC2574] and the
   View-based Access Control Model RFC 2575 [RFC2575] 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. Editor's  Address

   Jeff Johnson
   RedBack Networks. Inc.
   300 Holger Way
   San Jose, CA 95134-1362
   Phone: +1 408 750 5460
   Email: jeff@redback.com

   Michael Thatcher
   RedBack Networks. Inc.
   300 Holger Way
   San Jose, CA 95134-1362



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   Phone: +1 408 750 5449
   Email: thatcher@redback.com

   Jim Kuhfeld
   RedBack Networks. Inc.
   300 Holger Way
   San Jose, CA 95134-1362
   Phone: +1 408 750 5465
   Email: jkuhfeld@redback.com



10. 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 implmentation 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."











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