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Versions: 00 01 02 03 04 05 06 07 08 09 10 11 12 RFC 2959

Internet Draft   RTP MIB                        February 26, 1998



                 Real-Time Transport Protocol
                 Management Information Base
               <draft-ietf-avt-rtp-mib-04.txt>


                        February 26, 1998

                                             Mark Baugher
                       Intel Corporation
                      2111 N.E.25th Avenue
                    Hillsboro, Oregon  97124

                      mbaugher@intel.com

                                        Bill Strahm
                       Intel Corporation
                      2111 N.E.25th Avenue
                    Hillsboro, Oregon  97124

                     Bill.Strahm@intel.com

                                     Irina Suconick
                    Videoserver Corporation
                        63 Third Street
                Burlington, Massachusetts  01803

                   isuconick@videoserver.com



Status of this Memo

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


This document is an Internet-Draft.  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.  Internet-Drafts may be updated, replaced, or made
obsolete by other documents at any time.  It is not
appropriate to use Internet-Drafts as reference material or to
cite them other than as a ``working draft'' or ``work inprogress.''
To learn the current status of any Internet-Draft, please
check the 1id-abstracts.txt listing contained in the Internet-
Drafts Shadow Directories on ftp.ietf.org, nic.nordu.net,
venera.isi.edu, or munnari.oz.au.



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1.  Changes from Previous Draft

There were three main changes to the draft.

Section 4.3.3 was added to clarify that host systems may include data
gathered from RTCP data on streams that they are involved with.

rtpSessionIndex was changed to allow 2^31-1 indexes and also a note saying
that sessions are not required to be sequential.  This is from some
questions about subagents allocating indexes out of an internal "sub-pool"
and the need to renumber indexes after a row deletion.

rtpSessionIfAddr was removed and rtpSessionIfIndex was made into an
InterfaceIndex.  It was determined that all addresses will go through
an indexed interface, therefor it was complicated and confusing
maintaining the two objects.

2.  Abstract

This memo defines an experimental  Management Information Base
(MIB) for use with network management protocols in
TCP/IP-based internets.  In particular, it defines objects for
managing Real-Time Transport Protocol systems [1].  Comments
should be made to the IETF Audio/Video Transport Working Group
at rem-conf@es.net.This memo does not specify a standard for the Internet
community.





















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3.  The Network Management Framework

The SNMP Management Framework presently consists of five major
components:

  o   An overall architecture, described in RFC 2271 [2].

  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
      RFC 1155 [3], RFC 1212 [4] and RFC 1215 [5]. The second version,
      called SMIv2, is described in RFC 1902 [6], RFC 1903 [7] and RFC
      1904 [8].

  o   Message protocols for transferring management information. The
      first version of the SNMP message protocol is called SNMPv1 and
      described in RFC 1157 [9]. A second version of the SNMP message
      protocol, which is not an Internet standards track protocol, is
      called SNMPv2c and described in RFC 1901 [10] and RFC 1906 [11].
      The third version of the message protocol is called SNMPv3 and
      described in RFC 1906 [11], RFC 2272 [12] and RFC 2274 [13].

  o   Protocol operations for accessing management information. The
      first set of protocol operations and associated PDU formats is
      described in RFC 1157 [9]. A second set of protocol operations
      and associated PDU formats is described in RFC 1905 [14].

  o   A set of fundamental applications described in RFC 2273 [15] and
      the view-based access control mechanism described in RFC 2275
      [16].

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 theMIB.





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4. Overview

An "RTP System" may be a host end-system that runs an application
program that sends or receives RTP data packets, or it may be an
intermediate-system that forwards RTP packets.  RTP Control
Protocol (RTCP) packets are sent by senders and receivers to
convey information about RTP packet transmission and reception [1].
RTP monitors may collect RTCP information on senders and receivers
to and from an RTP host or intermediate-system.

4.1 Components

The RTP MIB is structured around "session," "Receiver" and "Sender"
conceptual abstractions.

4.1.1  An "RTP session" is the "...association of participants
communicating with RTP.  For each participant, the session is
defined by a particular pair of destination transport addresses
(one network address plus a port pair for RTP and RTCP).  The
destination transport addresses may be common for all participants,
as in the case of IP multicast, or may be different for each, as in
the case of individual unicast addresses plus a common port pair,"
as defined in section 3 of [1].

4.1.2 A "Sender" is identified within an RTP session by a 32-bit numeric
"Synchronization Source," or "SSRC", value and is "...the source of a
stream of RTP packets" as defined in section 3 of [1].  The sender is
also a source of RTCP Sender Report packets as specified in section 6 of [1].

4.1.3 A "Receiver" of a "stream of RTP packets" can be a unicast or
multicast Receiver as described in 4.2.1, above. An RTP Receiver has
an SSRC value that is unique to the session.  An RTP Receiver is a
source of RTCP Receiver Reports as specified in section 6 of [1].

4.2 Applicability of the MIB to RTP System Implementations

The RTP MIB may be used in two types of RTP implementations, RTP Host
Systems (end systems)  and RTP Monitors, see section 3 of [1].
Use of the RTP MIB for RTP Translators and Mixers, as defined in
section 7 of [1], is for further study.








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4.2.1 RTP host Systems are end-systems that may use the RTP MIB
to collect RTP session and stream data that the host is sending or
receiving; these data may be used by a network manager to detect and
diagnose faults that occur over the life time of an RTP session as
in a "help-desk" scenario.

4.2.2 RTP Monitors of multicast RTP sessions may be third-party, or
may be located in an RTP intermediate-system or in the host.  RTP
Monitors may use the RTP MIB to collect RTP session and stream
statistical data; these data may be used by a network manager for
capacity planning and other network-management purposes.  An RTP
Monitor may use the RTP MIB to collect data to permit a network
manager to detect and diagnose faults in RTP sessions, or to permit
a network manger to configure its operation.

4.2.3 Many host systems will want to keep track of streams beyond what
they are sending and receiving.  In this mode a host system would use
RTP data from the host to maintain data about streams it is sending and
receiving, and RTCP data to collect data about other hosts in the session.
For example an RTP host that is sending a stream would use data from
its RTP stack to maintain the rtpSenderTable, however it may want to
maintain a rtpReceiverTable for endpoints that are receiving its stream.
To do this the host will collect RTCP data from the receivers of its
stream to build the rtpReceiverTable.

4.3  The Structure of the RTP MIB

There are three tables in the RTP MIB.  The rtpSessionTable contains
objects that describe active sessions at the host, intermediate system,
or monitor.  The rtpSenderTable contains information about senders
to the RTP session.  The rtpRcvrTable contains information about
receivers of RTP session data.

For any particular RTP session, the rtpSessionMonitor object indicates
whether information about remote senders or receivers to the RTP
session are to be monitored.  RTP sessions are monitored by the
RTP agent that updates rtpSenderTable and rtpRcvrTable objects with
information from RTCP reports from remote senders or remote receivers
respectively.

rtpSessionNewIndex is a global object that permits a network-management
application to obtain a unique index for conceptual row creation
in the rtpSessionTable.  In this way the SNMP Set operation may
be used to configure a monitor.




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5. DefinitionsRTP-MIB DEFINITIONS ::= BEGIN
IMPORTS
       Counter32, Counter64, Gauge32, experimental, Integer32,
       MODULE-IDENTITY, OBJECT-IDENTITY,
       OBJECT-TYPE, Unsigned32                     FROM SNMPv2-SMI
       DisplayString, RowStatus, TAddress,
       TDomain, TestAndIncr, TEXTUAL-CONVENTION,
       TimeStamp, TruthValue                       FROM SNMPv2-TC
       OBJECT-GROUP, MODULE-COMPLIANCE             FROM SNMPv2-CONF;
       InterfaceIndex                              FROM IF-MIB;

rtpMIB MODULE-IDENTITY
        LAST-UPDATED "990222000Z"
    ORGANIZATION "IETF AVT Working Group"
        CONTACT-INFO
            "Mark Baugher
        Postal: Intel Corporation
                2111 NE 25th Avenue
                    Hillsboro, OR   97124
                United States
        Tel:    +1 503 264 3849
    Email:  mbaugher@intel.com

                        Bill Strahm
        Postal: Intel Corporation
                        2111 NE 25th Avenue
            Hillsboro, OR   97124
                        United States
    Tel:    +1 503 264 4632
        Email:  bill.strahm@intel.com

                        Irina Suconick
        Postal: Videoserver Corporation
            63 Third Street
                        Burlington, MA  01803
            United States
        Tel:    +1 781-505-2155
        Email:  isuconick@videoserver.com"










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        DESCRIPTION
        "The managed objects of RTP systems.  The MIB is
        structured around three types of information.
        1. General information about RTP sessions such
           as the session address.
        2. Information about RTP streams being sent to
           an RTP session by a particular source.
        3. Information about RTP streams received on an
           RTP session by a particular receiver from a
            particular sender.
         There are two types of RTP Systems, RTP hosts and
         RTP monitors.  As described below, certain objects
         are unique to a particular type of RTP System.   An
         RTP host may also function as an RTP monitor.
         Refer to RFC 1889, 'RTP: A Transport Protocol for
         Real-Time Applications,' section 3.0, for definitions."
::= { experimental 77 }
-- ::== { mib-2 xx }  to be assigned by IANA when going to Proposed

--
-- OBJECTS
--
rtpMIBObjects OBJECT IDENTIFIER ::= { rtpMIB 1 }
rtpAdmin OBJECT IDENTIFIER ::= { rtpMIB 2 }
rtpConformance OBJECT IDENTIFIER ::= { rtpMIB 3 }
rtpDomains OBJECT IDENTIFIER ::= { rtpMIB 4 }

rtpUDPDomain OBJECT-IDENTITY
       STATUS          current
       DESCRIPTION
          "RTP over UDP transport domain over IPv4.  This definition
          uses the transport address type, snmpUDPAddress, which is
          defined in SNMPv2-TM, 'Transport Mappings for Version 2 of
          the Simple Network Management Protocol (SNMPv2)'."
       REFERENCE       "RFC 1906, sec. 2 "       ::= { rtpDomains 1 }














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--
--      SESSION TABLE
--
rtpSessionNewIndex OBJECT-TYPE
        SYNTAX          TestAndIncr
        MAX-ACCESS      read-write
        STATUS          current
        DESCRIPTION
      "This  object  is  used  to  assign  values  to
      rtpSessionIndex  as described in 'Textual
      Conventions  for  SNMPv2'.  For an RTP monitor
      system, the  network  manager would read
      the  object,  and  then write the value back in
      the Set that creates a new instance  of
      rtpSessionEntry.   If  the  Set  fails with the code
      'inconsistentValue,' then the process must be
      repeated; If the Set succeeds, then the object
      is incremented, and the  new  instance  is
      created according to the manager's directions.
      However, if the RTP agent is not acting as a monitor,
      only the RTP agent may create conceptual rows in the
      RTP session table.  The RTP agent is a monitor for a
      paricular session only if rtpSessionMonitor is set to
      'true(1)'."
    ::= { rtpMIBObjects 1 }

rtpSessionTable OBJECT-TYPE
        SYNTAX          SEQUENCE OF RtpSessionEntry
        MAX-ACCESS      not-accessible
                STATUS          current
        DESCRIPTION
          "There's one entry in rtpSessionTable for each RTP session
          on which packets are being sent, received, and/or
          monitored."
        ::= { rtpMIBObjects 2 }














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rtpSessionEntry OBJECT-TYPE
        SYNTAX          RtpSessionEntry
        MAX-ACCESS      not-accessible
        STATUS          current
        DESCRIPTION
          "Data in rtpSessionTable uniquely identify an RTP
       session.  A host RTP agent will create a read-only row for
       each session to which packets are being sent or received.
       An RTP session can be monitored to create management
       information on all RTP streams being sent or received when
       the rtpSessionMonitor has the TruthValue of 'true(1)'.  An
       RTP monitor may permit row creation with the side
       effect of causing the RTP System to join the session for
       the purposes of gathering management information (thus
       additional conceptual rows are created in the rtpRcvrTable
       and rtpSenderTable).  rtpSessionTable rows can be created
       for RTP session monitoring purposes.  Rows created by a
       management application may be deleted via SNMP operations.
       Rows created by a management application (rtSessionMonitor
       is 'true(1)') are deleted by the management application.
       When rtpSessionMonitor is 'false(2), rows are created by the
       RTP Agent at the start of a session when one or more or more
       senders or receivers are observed.  Rows created by an RTP
       agent are deleted when the session is over and there are no
       rtpRcvrEntry and no rtpSenderEntry for this session."
        INDEX { rtpSessionIndex  }
        ::= { rtpSessionTable 1 }

RtpSessionEntry ::= SEQUENCE {
                rtpSessionIndex         Integer32,
                rtpSessionDomain        TDomain,
                rtpSessionRemAddr       TAddress,
                rtpSessionLocAddr       TAddress,
        rtpSessionIfIndex       InterfaceIndex,
        rtpSessionSenderJoins   Counter32,
        rtpSessionReceiverJoins Counter32,
        rtpSessionByes          Counter32,
        rtpSessionStartTime     TimeStamp,
        rtpSessionMonitor       TruthValue,
        rtpSessionRowStatus     RowStatus
                }







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rtpSessionIndex OBJECT-TYPE
        SYNTAX          Integer32 (1..2147483647)
        MAX-ACCESS      not-accessible
        STATUS          current
        DESCRIPTION
      "The index of the conceptual row which is for SNMP purposes
       only and has no relation to any protocol value.  There is
           no requirement that these rows are created or maintained
           sequentially."
    ::= { rtpSessionEntry 1}

rtpSessionDomain OBJECT-TYPE
        SYNTAX          TDomain
        MAX-ACCESS      read-create
        STATUS          current
        DESCRIPTION
      "The transport-layer protocol used for sending or receiving
       the stream of RTP data packets on this session.
       Cannot be changed if rtpSessionRowStatus is 'active'."
    DEFVAL { rtpUDPDomain }
    ::= { rtpSessionEntry 2 }

rtpSessionRemAddr OBJECT-TYPE
        SYNTAX          TAddress
        MAX-ACCESS      read-create
        STATUS          current
        DESCRIPTION
      "The remote destination transport address on which the
       RTP data packet stream is sent and/or received.  An RTP
       Session is defined by a pair of destination transport
       addresses.  'The destination address pair may be common for
       all participants, as in the case of IP multicast, or may be
       different for each, as in the case of individual unicast
       network address pairs.'  See RFC 1889, 'RTP: A Transport
       Protocol for Real-Time Applications,' sec. 3.  The transport
       service is identified by rtpSessionDomain. For rtpUDPDomain,
       this is an IP address and even-numbered UDP Port with the
       RTCP being sent on the next higher odd-numbered port, see
       RFC 1889, sec. 5. Cannot be changed if  rtpSessionRowStatus
       is 'active'."
    ::= { rtpSessionEntry 3 }








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rtpSessionLocAddr OBJECT-TYPE
        SYNTAX          TAddress
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "The local destination transport address on which the stream
       of data packets is being sent and/or received.  For unicast
       RTP sessions, this is the local address of the
       RTP session.  For multicast RTP sessions, this object should
       have the same value as rtpSessionRemoteAddr.  See RFC 1889,
       'RTP: A Transport Protocol for Real-Time Applications,' sec.
       3.  The transport service is identified by rtpSessionDomain.
       For rtpUDPDomain, this is an IP address and even-numbered
       UDP Port with the RTCP being sent on the next higher
       odd-numbered port, see RFC 1889, sec. 5."
    ::= { rtpSessionEntry 4 }

rtpSessionIfIndex OBJECT-TYPE
    SYNTAX          InterfaceIndex
        MAX-ACCESS      read-create
    STATUS          current
        DESCRIPTION
     "The ifIndex value is set to the corresponding value
          from the Internet Standard MIB.  This is the interface
          that the RTP stream is being sent to or received from,
          or in the case of an RTP Monitor the interface that RTCP
          packets will be received on.  Cannot be changed if
          rtpSessionRowStatus is 'active'."
        DEFVAL { 0 }
        ::= { rtpSessionEntry 5 }



















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rtpSessionSenderJoins OBJECT-TYPE
        SYNTAX          Counter32
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "The number of senders that have been observed to have
       joined the session since this conceptual row was created
       (rtpSessionStartTime).  A sender 'joins' an RTP
       session by sending to it.  Senders that leave and then
       re-join following an RTCP BYE (See RFC 1889, 'RTP: A
       Transport Protocol for Real-Time Applications,' sec. 6.6)
       or session timeout may be counted twice.  Every time an
       rtpSenderEntry is created for this session, this counter
       is incremented."
        ::= { rtpSessionEntry 6 }

rtpSessionReceiverJoins OBJECT-TYPE
        SYNTAX          Counter32
    MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "The number of receivers that have been been observed to
       to have joined this session since this conceptual row was
       created (rtpSessionStartTime).  Receivers that leave and
       then re-join following an RTCP BYE (See RFC 1889, 'RTP: A
       Transport Protocol for Real-Time Applications,' sec. 6.6)
       or session timeout may be counted twice.  Every time an
       rtpRcvrEntry is created for this session, this counter
       is incremented."
        ::= { rtpSessionEntry 7 }


















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rtpSessionByes OBJECT-TYPE
        SYNTAX          Counter32
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "A count of RTCP BYE (See RFC 1889, 'RTP: A Transport
       Protocol for Real-Time Applications,' sec. 6.6) messages
       received by this entity."
        ::= { rtpSessionEntry 8 }

rtpSessionStartTime OBJECT-TYPE
        SYNTAX          TimeStamp
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "The value of SysUpTime at the time that this row was
       created."
        ::= { rtpSessionEntry 9 }

rtpSessionMonitor OBJECT-TYPE
        SYNTAX          TruthValue
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "Boolean, Set to 'true(1)' if senders or receivers in
       addition to the local RTP System are to be monitored.
       RTP Monitors MUST initialize to 'true(1)' and RTP
       Hosts MUST initialize this 'false(2)'."
    ::= { rtpSessionEntry 10 }

rtpSessionRowStatus OBJECT-TYPE
        SYNTAX          RowStatus
        MAX-ACCESS      read-create
    STATUS          current
        DESCRIPTION
      "Value of 'active' when RTP or RTCP messages are being
       sent or received by an RTP System.  A newly-created
       conceptual row must have the rtpSessionRemAddr and
       rtpSessionLocAddr initialized before becoming 'active'.
       A conceptual row that is in the 'notReady' or 'notInService'
       state MAY be removed after 5  minutes."
    ::= { rtpSessionEntry 11 }




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--
--  SENDERS TABLE
--
rtpSenderTable OBJECT-TYPE
    SYNTAX          SEQUENCE OF RtpSenderEntry
    MAX-ACCESS      not-accessible
    STATUS          current
    DESCRIPTION
      "Table of information about a sender or senders to an RTP
       Session. RTP sending hosts MUST have an entry in this table
       for each stream being sent.  RTP monitors create an entry
       for each observed sender to an RTP Session as a side-effect
       when a conceptual row in the rtpSessionTable is made
       'active' by a manager."
        ::= { rtpMIBObjects 3 }

rtpSenderEntry OBJECT-TYPE
        SYNTAX          RtpSenderEntry
    MAX-ACCESS      not-accessible
        STATUS          current
    DESCRIPTION
      "Each entry contains information from a single RTP Synch-
       ronization Source (SSRC, see RFC 1889 'RTP: A Transport
       Protocol for Real-Time Applications' sec.6).  The session is
       identified to the the SNMP entity by rtpSessionIndex.
       Rows are removed by the RTP agent when a BYE is received
       from the sender or when the sender times out (see RFC
       1889, Sec. 6.2.1).  Fate is shared with the rtpSessionIndex
       conceptual row as well."
    INDEX { rtpSessionIndex, rtpSenderSSRC }
        ::= { rtpSenderTable 1 }

RtpSenderEntry ::= SEQUENCE {
                rtpSenderSSRC           Unsigned32,
            rtpSenderCNAME          DisplayString,
            rtpSenderAddr           TAddress,
        rtpSenderPackets        Counter64,
        rtpSenderOctets         Counter64,
        rtpSenderTool           DisplayString,
        rtpSRs                  Counter32,
        rtpSenderSRTime         TimeStamp,
                rtpSenderPT             INTEGER,
        rtpSenderStartTime      TimeStamp
                }




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rtpSenderSSRC OBJECT-TYPE
        SYNTAX          Unsigned32
    MAX-ACCESS      not-accessible
        STATUS          current
    DESCRIPTION
      "The RTP SSRC, or synchronization source identifier of the
       sender.  The RTP session address plus an SSRC uniquely
       identify a sender or receiver of an RTP stream (see RFC
       1889, 'RTP: A Transport Protocol for Real-Time
       Applications' sec.3)."
        ::= { rtpSenderEntry 1 }

rtpSenderCNAME OBJECT-TYPE
        SYNTAX          DisplayString (SIZE(0..255))
    MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "The RTP canonical name of the sender."
        ::= { rtpSenderEntry 2 }

rtpSenderAddr OBJECT-TYPE
        SYNTAX          TAddress
    MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "The unicast transport source address of the sender."
    ::= { rtpSenderEntry 3 }

rtpSenderPackets OBJECT-TYPE
    SYNTAX          Counter64
        MAX-ACCESS      read-only
    STATUS          current
        DESCRIPTION
      "Count of RTP packets sent by this sender, or observed by
       an RTP monitor, since rtpSenderStartTime."
    ::= { rtpSenderEntry 4 }












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rtpSenderOctets OBJECT-TYPE
        SYNTAX          Counter64
    MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "Count of RTP octets sent by this sender, or observed by
       an RTP monitor, since rtpSenderStartTime."
    ::= { rtpSenderEntry 5 }

rtpSenderTool OBJECT-TYPE
    SYNTAX          DisplayString (SIZE(0..127))
    MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "Name of the application program source of the stream."
    DEFVAL { ''H }  -- Null if not available
        ::= { rtpSenderEntry 6 }

rtpSRs OBJECT-TYPE
        SYNTAX          Counter32
    MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "A count of the number of RTCP Sender Reports that have
       been sent from this sender, or observed if the RTP entity
       is a monitor, since rtpSenderStartTime."
    ::= { rtpSenderEntry 7 }

rtpSenderSRTime OBJECT-TYPE
        SYNTAX          TimeStamp
        MAX-ACCESS      read-only
    STATUS          current
        DESCRIPTION
      "rtpSenderSRTime is the value of SysUpTime at the time that
       the last SR was received from this sender, in the case of a
       monitor or receiving host.  Or sent by this sender, in the
       case of a sending host."
        ::= { rtpSenderEntry 8 }










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rtpSenderPT OBJECT-TYPE
        SYNTAX          INTEGER (0..127)
    MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "Static or dynamic payload type from the RTP header (see
       RFC 1889, 'RTP: A Transport Protocol for Real-Time
       Applications' sec. 5)."
        ::= { rtpSenderEntry 9 }

rtpSenderStartTime OBJECT-TYPE
        SYNTAX          TimeStamp
    MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "The value of SysUpTime at the time that this row was
       created."
        ::= { rtpSenderEntry 10 }

--
--  RECEIVERS TABLE
--
rtpRcvrTable OBJECT-TYPE
        SYNTAX          SEQUENCE OF RtpRcvrEntry
    MAX-ACCESS      not-accessible
        STATUS          current
    DESCRIPTION
      "Table of information about a receiver or receivers of RTP
       session data. RTP hosts that receive RTP session packets
       create an entry in this table for that receiver/sender
       pair. RTP monitors create an entry for each observed RTP
       session receiver as a side effect when a conceptual row
       in the rtpSessionTable is made 'active' by a manager."
    ::= { rtpMIBObjects 4 }














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rtpRcvrEntry OBJECT-TYPE
        SYNTAX          RtpRcvrEntry
        MAX-ACCESS      not-accessible
        STATUS          current
        DESCRIPTION
          "Each entry contains information from a single RTP
       Synchronization Source (SSRC, see RFC 1889, 'RTP: A
       Transport Protocol for Real-Time Applications' sec.6).
       The session is identified to the the SNMP entity by
       rtpSessionIndex.  Rows are removed by the RTP agent when
       a BYE is received from the sender or when the sender times
       out (see RFC 1889, Sec. 6.2.1).  Fate is shared with the
       rtpSessionIndex conceptual row as well."
        INDEX { rtpSessionIndex, rtpRcvrSRCSSRC, rtpRcvrSSRC }
    ::= { rtpRcvrTable 1 }

RtpRcvrEntry ::= SEQUENCE {
       rtpRcvrSRCSSRC        Unsigned32,
           rtpRcvrSSRC           Unsigned32,
       rtpRcvrCNAME          DisplayString,
       rtpRcvrAddr           TAddress,
           rtpRcvrRTT            Gauge32,
       rtpRcvrLostPackets    Counter64,
           rtpRcvrJitter         Gauge32,
       rtpRRs                Counter32,
       rtpRcvrTool           DisplayString,
       rtpRcvrRRTime         TimeStamp,
           rtpRcvrPT             INTEGER,
       rtpRcvrPackets        Counter64,
           rtpRcvrOctets         Counter64,
       rtpRcvrStartTime      TimeStamp
           }

rtpRcvrSRCSSRC OBJECT-TYPE
    SYNTAX       Unsigned32
        MAX-ACCESS   not-accessible
    STATUS       current
        DESCRIPTION
      "The RTP SSRC, or synchronization source identifier of the
       sender.  The RTP session address plus an SSRC uniquely
       identify a sender or receiver of an RTP stream (see RFC
       1889, 'RTP:  A Transport Protocol for Real-Time
       Applications' sec.3)."
        ::= { rtpRcvrEntry 1 }




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rtpRcvrSSRC OBJECT-TYPE
        SYNTAX       Unsigned32
        MAX-ACCESS   not-accessible
        STATUS       current
        DESCRIPTION
      "The RTP SSRC, or synchronization source identifier of the
       receiver.  The RTP session address plus an SSRC uniquely
       identify a sender or receiver of an RTP stream (see RFC
       1889, 'RTP:  A Transport Protocol for Real-Time
       Applications' sec.3)."
        ::= { rtpRcvrEntry 2 }

rtpRcvrCNAME OBJECT-TYPE
        SYNTAX       DisplayString (SIZE(0..255))
    MAX-ACCESS   read-only
        STATUS       current
        DESCRIPTION
      "The RTP canonical name of the receiver."
        ::= { rtpRcvrEntry 3 }

rtpRcvrAddr OBJECT-TYPE
        SYNTAX       TAddress
        MAX-ACCESS   read-only
    STATUS       current
        DESCRIPTION
      "The unicast transport address of the receiver."
    ::= { rtpRcvrEntry 4 }

rtpRcvrRTT OBJECT-TYPE
        SYNTAX       Gauge32
    MAX-ACCESS   read-only
        STATUS       current
        DESCRIPTION
      "The round trip time measurement taken by the source of the
       RTP stream based on the algorithm described on sec. 6 of
       RFC 1889, 'RTP: A Transport Protocol for Real-Time
       Applications.'  This algorithm can produce meaningful
       results when the RTP agent has the same clock as the stream
       sender (when the RTP monitor is also a sending host for the
       particular reciever).  Otherwise, the entity should return
       'noSuchInstance' in response to queries against rtpRcvrRTT."
    ::= { rtpRcvrEntry 5 }






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rtpRcvrLostPackets OBJECT-TYPE
        SYNTAX          Counter64
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "A count of RTP  packets lost as observed by this receiver
       since rtpRcvrStartTime."
        ::= { rtpRcvrEntry 6 }

rtpRcvrJitter OBJECT-TYPE
        SYNTAX          Gauge32
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "An estimate of delay variation as observed by this
       receiver."
        ::= { rtpRcvrEntry 7 }

rtpRcvrTool OBJECT-TYPE
        SYNTAX          DisplayString (SIZE(0..127))
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "Name of the application program source of the stream."
        DEFVAL { ''H }  -- Null if not available
        ::= { rtpRcvrEntry 8 }

rtpRRs OBJECT-TYPE
        SYNTAX          Counter32
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "A count of Receiver Reports as observed by this receiver
       since rtpSessionStartTime."
        ::= { rtpRcvrEntry 9 }













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rtpRcvrRRTime OBJECT-TYPE
        SYNTAX         TimeStamp
        MAX-ACCESS     read-only
        STATUS         current
        DESCRIPTION
      "rtpRcvrRRTime is the value of SysUpTime at the time that
       the last RTCP Receiver Report was received from this
       receiver, in the case of a monitor or RR receiver.  It is the
       value of SysUpTime at the time that the last RR was sent by
       this receiver in the case of a receiver sending the RR."
        ::= { rtpRcvrEntry 10 }

rtpRcvrPT OBJECT-TYPE
        SYNTAX          INTEGER (0..127)
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "Static or dynamic payload type from the RTP header (see
       RFC 1889, 'RTP: A Transport Protocol for Real-Time
       Applications' sec. 5)."
        ::= { rtpRcvrEntry 11 }

rtpRcvrPackets OBJECT-TYPE
        SYNTAX          Counter64
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "Count of RTP packets received by this RTP host receiver
       since rtpRcvrStartTime. RTP monitors may not have this
       information and should return 'noSuchInstance.'"
    ::= { rtpRcvrEntry 12 }

rtpRcvrOctets OBJECT-TYPE
        SYNTAX          Counter64
        MAX-ACCESS      read-only
    STATUS          current
        DESCRIPTION
      "Count of RTP octets received by this receiving RTP host
       since rtpRcvrStartTime.  RTP monitors may not have this
       this information and should return 'noSuchInstance.'"
    ::= { rtpRcvrEntry 13 }








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rtpRcvrStartTime OBJECT-TYPE
        SYNTAX          TimeStamp
        MAX-ACCESS      read-only
        STATUS          current
        DESCRIPTION
      "The value of SysUpTime at the time that this row was
       created."
        ::= { rtpRcvrEntry 14 }








































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--
--  MODULE GROUPS
--
rtpGroups OBJECT IDENTIFIER ::= { rtpConformance 1 }
rtpSystemGroup      OBJECT-GROUP
                OBJECTS         {
                            rtpSessionDomain,
                        rtpSessionRemAddr,
                        rtpSessionIfIndex,
                        rtpSessionSenderJoins,
                        rtpSessionReceiverJoins,
                        rtpSessionStartTime,
                        rtpSessionRowStatus,
                        rtpSessionByes,
                                        rtpSessionMonitor,
                        rtpSenderCNAME,
                                    rtpSenderAddr,
                        rtpSenderPackets,
                                        rtpSenderOctets,
                        rtpSenderTool,
                                        rtpSRs,
                        rtpSenderSRTime,
                        rtpSenderStartTime,
                                    rtpRcvrCNAME,
                        rtpRcvrAddr,
                                        rtpRcvrLostPackets,
                        rtpRcvrJitter,
                                        rtpRcvrTool,
                        rtpRRs,
                                    rtpRcvrRRTime,
                        rtpRcvrStartTime
                                    }
        STATUS           current
                DESCRIPTION
                   "Objects used by all RTP systems."
                ::= { rtpGroups 1 }













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rtpHostGroup      OBJECT-GROUP
                OBJECTS         {
                        rtpSessionLocAddr,
                                                rtpSenderPT,
                        rtpRcvrPT,
                                                rtpRcvrRTT,
                        rtpRcvrOctets,
                                                rtpRcvrPackets
                        }
                STATUS           current
                DESCRIPTION
               "Objects used by RTP host systems."
                ::= { rtpGroups 2 }

rtpMonitorGroup  OBJECT-GROUP
                OBJECTS         {
                        rtpSessionNewIndex
                                                }
                STATUS          current
                DESCRIPTION
               "Objects used by RTP monitor systems."
                ::= { rtpGroups 3 }

--
--  Compliance
--
rtpCompliances OBJECT IDENTIFIER ::= { rtpConformance 2 }

rtpHostCompliance MODULE-COMPLIANCE
        STATUS          current
    DESCRIPTION
          "Host implementations must comply."
    MODULE           RTP-MIB
                MANDATORY-GROUPS { rtpSystemGroup }
        GROUP  rtpHostGroup
                        DESCRIPTION
               "The objects in the rtpHostGroup MUST be
               implemented in RTP host systems that are the source
               or the destination of RTP data packets."
        ::= { rtpCompliances 1 }








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rtpMonitorCompliance MODULE-COMPLIANCE
        STATUS          current
        DESCRIPTION
          "Monitor implementations must comply."
    MODULE           RTP-MIB
                MANDATORY-GROUPS     {
                             rtpSystemGroup,
                             rtpHostGroup
                                                     }
        GROUP  rtpMonitorGroup
                        DESCRIPTION
               "The objects in the rtpMonitorGroup MUST be
               implemented in RTP monitors."
                OBJECT  rtpSessionNewIndex
            MIN-ACCESS not-accessible
                                DESCRIPTION
                 "RTP host system implementations support of
                  row creation and deletion is OPTIONAL so
                  implementation of this object is OPTIONAL."
        OBJECT  rtpSessionDomain
                    MIN-ACCESS read-only
                DESCRIPTION
                 "RTP host system implementation support of
                  row creation and deletion is OPTIONAL.  When
                  it is not supported so write access is
                  OPTIONAL."
                OBJECT  rtpSessionRemAddr
            MIN-ACCESS read-only
                        DESCRIPTION
             "Row creation and deletion is OPTIONAL so
              read-create access to this object is OPTIONAL."
        OBJECT  rtpSessionIfIndex
                MIN-ACCESS read-only
            DESCRIPTION
             "Row creation and deletion is OPTIONAL so
              read-create access to this object is OPTIONAL."












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        OBJECT  rtpSessionRowStatus
                    MIN-ACCESS not-accessible
                DESCRIPTION
             "Row creation and deletion is OPTIONAL so
              read-create access to this object is OPTIONAL."
        OBJECT  rtpSessionLocAddr
                    MIN-ACCESS not-accessible
                DESCRIPTION
             "RTP monitor sourcing of RTP or RTCP data packets
                  is OPTIONAL and implementation of this object is
              OPTIONAL."
                OBJECT  rtpRcvrPT
            MIN-ACCESS not-accessible
                        DESCRIPTION
             "RTP monitor systems NEED NOT support
              retrieval of the RTP Payload Type from the RTP
              header (and may receive RTCP messages only).  When
              queried for the payload type information, the
              RTP agent may return 'noSuchObject'."
        OBJECT  rtpSenderPT
                MIN-ACCESS not-accessible
            DESCRIPTION
             "RTP monitor systems may recieve only the RTCP messages
              and not the RTP messages that contain the payload type
              information in the header.  Thus implementation of this
              object is OPTIONAL."
                OBJECT  rtpRcvrOctets
            MIN-ACCESS not-accessible
                        DESCRIPTION
             "RTP monitor systems may recieve only the RTCP messages
              and not the RTP messages that contain the octet count
              of the RTP message.  Thus implementation of this
              object is OPTIONAL."
                OBJECT  rtpRcvrPackets
            MIN-ACCESS not-accessible
                        DESCRIPTION
             "RTP monitor systems may recieve only the RTCP messages
              and not the RTP messages that contain the octet count
              of the RTP message.  Thus implementation of this
              object is OPTIONAL."
                ::= { rtpCompliances 2 }
END






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6.  Security Issues
In most cases, MIBs are not themselves security risks; if SNMP security
is operating as intended, the use of a MIB to view information about a
system, or to change some parameter at the system, is a tool, not a threat.
None of the read-only objects in this MIB reports a password, though
some SDES items such as the CNAME, the canonical name, may be deemed
sensitive depending on the security policies of a particular
enterprise.  If access to these objects is not limited by an
appropriate access control policy, these objects can provide an
attacker with information about a system's configuration and the
services that that system is providing.  Some enterprises view their
network and system configurations themselves, as well as information
about usage and performance, as corporate assets; such enterprises may
wish to restrict SNMP access to most of the objects in the MIB.
This MIB supports read-write operations against rtpSessionNewIndex which
has the side effect of creating an entry in the rtpSessionTable when it
is written to.  Five objects in rtpSessionEntry have read-create access:
rtpSessionDomain, rtpSessionRemAddr, rtpSessionIfIndex,
rtpSessionRowStatus rtpSessionIfAddr identify an RTP session to be
monitored on a particular interface.  The values of these objects are
not to be changed once created, and initialization of these objects
affects only the monitoring of an RTP session and not the operation of
an RTP session on any host end-system.  Since write operations to
rtpSessionNewIndex and the five objects in rtpSessionEntry affect the
operation of the monitor, write access to these objects should be
subject to the appropriate access control policy.
Confidentiality of RTP and RTCP data packets is defined in section 9 of
the RTP specification [1].  Encryption may be performed on RTP packets,
RTCP packets, or both.  Encryption of RTCP packets may pose a problem
for third-party monitors though "For RTCP, it is allowed to split a
compound RTCP packet into two lower-layer packets, one to be encrypted
and one to be sent in the clear.  For example, SDES information might
be encrypted while reception reports were sent in the clear to
accommodate third-party monitors [1]."



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7.  Acknowledgements
The authors wish to thank Bert Wijnen and the participants from the
ITU SG-16 management effort for their helpful comments.  Alan Batie
and Bill Lewis from Intel also contributed greatly to the RTP MIB
through their review of various drafts of the MIB and their work
on the implementation of an SNMP RTP Monitor.


8.  References

[1]  H. Shulzrinne, S. Casner, R. Frederick, and V. Jacobson, "RTP:
     A Transport Protocol for real-time applications," RFC 1889.

[2]  Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for
     Describing SNMP Management Frameworks", RFC 2271, Cabletron
     Systems, Inc., BMC Software, Inc., IBM T. J. Watson Research,
     January 1998

[3]  Rose, M., and K. McCloghrie, "Structure and Identification of
     Management Information for TCP/IP-based Internets", RFC 1155,
     Performance Systems International, Hughes LAN Systems, May 1990

[4]  Rose, M., and K. McCloghrie, "Concise MIB Definitions", RFC 1212,
     Performance Systems International, Hughes LAN Systems, March 1991

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

[6]  Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Structure
     of Management Information for Version 2 of the Simple Network
     Management Protocol (SNMPv2)", RFC 1902, SNMP Research,Inc., Cisco
     Systems, Inc., Dover Beach Consulting, Inc., International Network
     Services, January 1996.

[7]  Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Textual
     Conventions for Version 2 of the Simple Network Management Protocol
     (SNMPv2)", RFC 1903, SNMP Research, Inc., Cisco Systems, Inc.,
     Dover Beach Consulting, Inc., International Network Services,
     January 1996.



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[8]  Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Conformance
     Statements for Version 2 of the Simple Network Management Protocol
     (SNMPv2)", RFC 1904, SNMP Research, Inc., Cisco Systems, Inc.,
     Dover Beach Consulting, Inc., International Network Services,
     January 1996.

[9]  Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple Network
     Management Protocol", RFC 1157, SNMP Research, Performance Systems
     International, Performance Systems International, MIT Laboratory
     for Computer Science, May 1990.

[10]  Case, J., McCloghrie, K., Rose, M., and S. Waldbusser,
     "Introduction to Community-based SNMPv2", RFC 1901, SNMP Research,
     Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc.,
     International Network Services, January 1996.

[11] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Transport
     Mappings for Version 2 of the Simple Network Management Protocol
     (SNMPv2)", RFC 1906, SNMP Research, Inc., Cisco Systems, Inc.,
     Dover Beach Consulting, Inc., International Network Services,
     January 1996.

[12] Case, J., Harrington D., Presuhn R., and B. Wijnen, "Message
     Processing and Dispatching for the Simple Network Management
     Protocol (SNMP)", RFC 2272, SNMP Research, Inc., Cabletron Systems,
     Inc., BMC Software, Inc., IBM T. J. Watson Research, January 1998.

[13] Blumenthal, U., and B. Wijnen, "User-based Security Model (USM) for
     version 3 of the Simple Network Management Protocol (SNMPv3)", RFC
     2274, IBM T. J. Watson Research, January 1998.

[14] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol
     Operations for Version 2 of the Simple Network Management Protocol
     (SNMPv2)", RFC 1905, SNMP Research, Inc., Cisco Systems, Inc.,
     Dover Beach Consulting, Inc., International Network Services,
     January 1996.

[15] Levi, D., Meyer, P., and B. Stewart, "SNMPv3 Applications", RFC
     2273, SNMP Research, Inc., Secure Computing Corporation, Cisco
     Systems,  January 1998

[16] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access
     Control Model (VACM) for the Simple Network Management Protocol
     (SNMP)", RFC 2275, IBM T. J. Watson Research, BMC Software, Inc.,
     Cisco Systems, Inc., January 1998



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