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Versions: 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 RFC 6396

Network Working Group                                           L. Blunk
Internet-Draft                                                  M. Karir
Expires: April 27, 2006                                    Merit Network
                                                             C. Labovitz
                                                          Arbor Networks
                                                        October 24, 2005


                 MRT routing information export format
                       draft-ietf-grow-mrt-01.txt

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
   applicable patent or other IPR claims of which he or she is aware
   have been or will be disclosed, and any of which he or she becomes
   aware will be disclosed, in accordance with Section 6 of BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Drafts.

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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

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   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.

   This Internet-Draft will expire on April 27, 2006.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This document describes the MRT format for routing information
   export.  This format was developed in concert with the Multi-threaded
   Routing Toolkit (MRT) from whence the format takes it name.  The
   format can be used to export routing protocol messages, state
   changes, and routing information base contents.




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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Basic MRT Format . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  MRT Control Types  . . . . . . . . . . . . . . . . . . . . . .  6
     3.1   NULL Type  . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.2   START Type . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.3   DIE Type . . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.4   I_AM_DEAD Type . . . . . . . . . . . . . . . . . . . . . .  6
     3.5   PEER_DOWN Type . . . . . . . . . . . . . . . . . . . . . .  6
   4.  MRT Routing Information Types  . . . . . . . . . . . . . . . .  7
     4.1   BGP Type . . . . . . . . . . . . . . . . . . . . . . . . .  7
       4.1.1   BGP_NULL Subtype . . . . . . . . . . . . . . . . . . .  7
       4.1.2   BGP_UPDATE Subtype . . . . . . . . . . . . . . . . . .  7
       4.1.3   BGP_PREF_UPDATE Subtype  . . . . . . . . . . . . . . .  8
       4.1.4   BGP_STATE_CHANGE Subtype . . . . . . . . . . . . . . .  8
       4.1.5   BGP_SYNC Subtype . . . . . . . . . . . . . . . . . . .  8
       4.1.6   BGP_OPEN . . . . . . . . . . . . . . . . . . . . . . .  9
       4.1.7   BGP_NOTIFY . . . . . . . . . . . . . . . . . . . . . .  9
       4.1.8   BGP_KEEPALIVE  . . . . . . . . . . . . . . . . . . . .  9
     4.2   RIP Type . . . . . . . . . . . . . . . . . . . . . . . . .  9
     4.3   IDRP Type  . . . . . . . . . . . . . . . . . . . . . . . . 10
     4.4   RIPNG Type . . . . . . . . . . . . . . . . . . . . . . . . 10
     4.5   BGP4PLUS and BGP4PLUS_01 Types . . . . . . . . . . . . . . 10
     4.6   OSPF Type  . . . . . . . . . . . . . . . . . . . . . . . . 10
     4.7   TABLE_DUMP Type  . . . . . . . . . . . . . . . . . . . . . 11
     4.8   BGP4MP Type  . . . . . . . . . . . . . . . . . . . . . . . 12
       4.8.1   BGP4MP_STATE_CHANGE Subtype  . . . . . . . . . . . . . 12
       4.8.2   BGP4MP_MESSAGE Subtype . . . . . . . . . . . . . . . . 13
       4.8.3   BGP4MP_ENTRY Subtype . . . . . . . . . . . . . . . . . 14
       4.8.4   BGP4MP_SNAPSHOT Subtype  . . . . . . . . . . . . . . . 14
     4.9   BGP4MP_ET  . . . . . . . . . . . . . . . . . . . . . . . . 14
     4.10  ISIS . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     4.11  ISIS_ET  . . . . . . . . . . . . . . . . . . . . . . . . . 15
     4.12  OSPF_ET  . . . . . . . . . . . . . . . . . . . . . . . . . 15
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 17
   6.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 18
     6.1   Normative References . . . . . . . . . . . . . . . . . . . 18
     6.2   Informative References . . . . . . . . . . . . . . . . . . 18
       Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 18
       Intellectual Property and Copyright Statements . . . . . . . . 19










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1.  Introduction

   Researchers and engineers often wish to analyze network behavior by
   studying routing protocol transactions and routing information base
   snapshots.  To this end, the MRT format was developed to encapsulate,
   export, and archive this information in a standardized data
   representation.  The BGP routing protocol, in particular, has been
   the subject of extensive study and analysis which has been
   significantly aided by the availability of the MRT format.

   This memo serves to document the MRT format as currently implemented
   in publicly available software.  The format has been extended since
   it's original introduction in the MRT toolset and these extensions
   are also included in this memo.  Further extensions may be introduced
   at a later date through additional definitions of the MRT Type field.




































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2.  Basic MRT Format

   All MRT format messages have a common header which includes a
   timestamp, type, subtype, and length field.  The header is followed
   by a message field.  The basic MRT format is illustrated below.

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                           Timestamp                           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |             Type              |            Subtype            |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                             Length                            |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      Message... (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Header Field Descriptions:


      Timestamp:

         Time in seconds since 1 January 1970 00:00:00 UTC


      Type:

         A 2-octet field that indicates the type of information
         contained in the message field.  Types 1 through 5 are used for
         MRT control information while Types 6 and higher are used for
         routing information.


      Subtype:

         A 2-octet message subtype field


      Length:

         A 4-octet message length field.  The length does not include
         the header.


      Message:





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         A variable length message.  The contents of this field are
         context dependent on the type and subtype fields.

















































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3.  MRT Control Types

   The MRT format defines five control type messages.  These messages
   are using to relay the current state of MRT message source.  The
   message field may contain an optional ASCII text string for
   diagnostic purposes.  These control messages are unidirectional in
   nature and there is no form of an acknowledgment or response from the
   receiver to the sender.  The subtype field is unused for these types
   and should be set to 0.

   The MRT Control Types are defined below:

       0    NULL
       1    START
       2    DIE
       3    I_AM_DEAD
       4    PEER_DOWN


3.1  NULL Type

   The NULL Type message causes no operation,  A sender may wish to send
   these for synchronization or keep-alive purposes.

3.2  START Type

   The START Type indicates a sender is about to begin sending MRT
   messages

3.3  DIE Type

   A DIE Type signals that the receiver should shut down.

3.4  I_AM_DEAD Type

   A I_AM_DEAD indicates that the sender is shutting down.

3.5  PEER_DOWN Type

   A PEER_DOWN is sent when the sender's peer is down.  In practice, a
   sender will likely have multiple peers.  It is recommended that the
   sender use the Message field to convey the IP address of the peer
   represented in US-ASCII.








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4.  MRT Routing Information Types

   The following types are currently defined for the MRT format.  Types
   5-12 were defined in the initial MRT Toolkit package.  The BGP4MP
   type, number 16, was defined in the Zebra routing software package.

       5    BGP
       6    RIP
       7    IDRP
       8    RIPNG
       9    BGP4PLUS
       10   BGP4PLUS_01
       11   OSPF
       12   TABLE_DUMP
       16   BGP4MP
       17   BGP4MP_ET
       32   ISIS
       33   ISIS_ET
       64   OSPF_ET


4.1  BGP Type

   The BGP Type indicates the Message field contains BGP routing
   information.  The BGP routing protocol is defined in RFC 1771 [1].
   The information in the message is dependent on the Subtype value.
   The BGP Type is considered to be deprecated by the BGP4MP Type.

   The following BGP subtypes are defined for the MRT BGP Type.

       0    BGP_NULL
       1    BGP_UPDATE
       2    BGP_PREF_UPDATE
       3    BGP_STATE_CHANGE
       4    BGP_SYNC
       5    BGP_OPEN
       6    BGP_NOTIFY
       7    BGP_KEEPALIVE


4.1.1  BGP_NULL Subtype

   The BGP_NULL Subtype is a reserved subtype.

4.1.2  BGP_UPDATE Subtype

   The BGP_UPDATE Subtype is used to encode BGP UPDATE messages.  The
   format of the MRT Message field for this subtype is as follows:



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        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Source AS number       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                        Source IP address                      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |    Destination AS number      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      Destination IP address                   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                    BGP UPDATE Contents (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The BGP UPDATE contents include the entire BGP UPDATE message which
   follows the BGP Message Header.  The BGP Message Header itself is not
   included.

4.1.3  BGP_PREF_UPDATE Subtype

   The BGP_PREF_UPDATE Subtype is not defined.

4.1.4  BGP_STATE_CHANGE Subtype

   The BGP_STATE_CHANGE Subtype is used to record changes in the BGP
   finite state machine.  These FSM states and their numeric encodings
   are defined in RFC 1771 [1], Appendix 1.  Both the old state value
   and the new state value are encoded as 2-octet numbers.  The format
   of the MRT Message field is as follows:

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Source AS number       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                       Source IP address                       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |            Old State          |          New State            |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


4.1.5  BGP_SYNC Subtype

   The BGP_SYNC Subtype is used to indicate a File Name where BGP Table
   Dump messages should be recorded.  The View # corresponds to the View
   # provided in the TABLE_DUMP Type messages.  The following format
   applies to this Subtype:




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        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        View #                 |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |            File Name... (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The File Name is terminated with a NULL (0) character.

4.1.6  BGP_OPEN

   The BGP_OPEN Subtype is used to encode BGP OPEN messages.  The format
   of the MRT Message field for this subtype is the same as the
   BGP_UPDATE, however, the last field contains the contents of the BGP
   OPEN message.

4.1.7  BGP_NOTIFY

   The BGP_NOTIFY Subtype is used to encode BGP NOTIFICATION messages.
   The format of the MRT Message field for this subtype is the same as
   the BGP_UPDATE, however, the last field contains the contents of the
   BGP NOTIFICATION message.

4.1.8  BGP_KEEPALIVE

   The BGP_KEEPALIVE Subtype is used to encode BGP KEEPALIVE messages.
   The format of the MRT Message field for this subtype is the same as
   the BGP_UPDATE, however, the last field contains no information.

4.2  RIP Type

   The RIP Type is used to export RIP protocol packets as defined in RFC
   1058 [2].  The Subtype field is currently reserved for this type and
   should be set to 0.

   The format of the MRT Message field for the RIP Type is as follows:

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                        Source IP address                      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      Destination IP address                   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                    RIP Message Contents (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




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4.3  IDRP Type

   The IDRP Type is used to export Inter-Domain-Routing Protocol (IDRP)
   protocol information as defined in the ISO/IEC 10747 standard.  The
   Subtype field is unused.  This type is deprecated due to lack of
   deployment of IDRP.

4.4  RIPNG Type

   The RIPNG Type is used to export RIPNG protocol packets as defined in
   RFC 2080 [3].  The Subtype field is currently reserved for this type
   and should be set to 0.

   The format of the MRT Message field for the RIPNG Type is as follows:

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                        Source IP address                      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      Destination IP address                   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                  RIPNG Message Contents (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


4.5  BGP4PLUS and BGP4PLUS_01 Types

   The BGP4PLUS and BGP4PLUS_01 Types were defined to support IPv6 BGP
   routing information.  The BGP4PLUS Type was specified based on the
   initial Internet Draft for Multiprotocol Extensions to BGP-4.  The
   BGP4PLUS_01 Type was specified to correspond to the -01 revision of
   this Internet Draft.  The two types share the same definitions in
   terms of their MRT format specifications.

   The Subtype field definitions are shared with the BGP Type, however,
   the address fields in the BGP_UPDATE, BGP_OPEN, BGP_NOTIFY,
   BGP_KEEPALIVE, and BGP_STATE_CHANGE subtype messages are extended to
   16 octets for IPv6 addresses.  As with the BGP Type, the BGP4PLUS and
   BGP4PLUS_01 Types are deprecated as they superseded by the BGP4MP
   Type.

4.6  OSPF Type

   This type supports the OSPF Protocol as defined in RFC 2328 [4].  The
   Subtype field may contain two possible values:

       0    OSPF_STATE_CHANGE



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       1    OSPF_LSA_UPDATE

   The format of the MRT Message field for the OSPF Type is as follows:

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                        Source IP address                      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      Destination IP address                   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                  OSPF Message Contents (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


4.7  TABLE_DUMP Type

   The TABLE_DUMP Type is used to encode routing table dumps.  The
   Subtype is used to encode whether the table entry contains IPv4 or
   IPv6 addresses.  There are currently two possible values for the
   Subtype as shown below.

       1    AFI_IPv4
       2    AFI_IPv6

   The format of the TABLE_DUMP Type is illustrated below.

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |           View #              |       Sequence number         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                        Prefix (variable)                      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Prefix Length |    Status     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                         Originated Time                       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                    Peer IP address (variable)                 |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |           Peer AS             |       Attribute Length        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                   BGP Attribute... (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The View field is normally 0 and is intended for cases where an
   implementation may have multiple RIB views (such as a route server).
   The Sequence field is a simple incremental counter for a concatenated



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   series of TABLE_DUMP Type messages.

   The Prefix field contains the IP address of a particular routing
   table dump entry.  The size of this field is dependent on the value
   of the Subtype for this message.  For AFI_IPv4, this field is 4
   octets, for AFI_IPv6, it is 16 octets in length.  The Prefix Length
   field indicates the length in bits of the prefix mask for the
   preceding Prefix field.

   The Status octet is not used in the TABLE_DUMP Type and should be set
   to 1.

   The Originated Time contains the 4-octet time at which this prefix
   was heard.  The value represents the time in seconds since 1 January
   1970 00:00:00 UTC.

   The Peer ID field is the IP address of the peer which provided the
   update for this routing table entry.  As with the Prefix field, the
   size of this field is dependent on the Subtype.  AFI_IPv4 indicates a
   4 octet field and an IPv4 address, while a Subtype of AFI_IPv6
   requires a 16 octet field and an IPv6 address.  The Peer AS field
   contains the AS number of the peer.

   Attribute length is the length of Attribute field and is 2-octets.
   The Attribute field contains the attribute information for the route
   table entry.

4.8  BGP4MP Type

   This type was initially defined in the Zebra software package for the
   BGP protocol with multiprotocol extension support.  It supersedes the
   BGP, BGP4PLUS, BGP4PLUS_01 Types.  The BGP4MP Type has four subtypes
   which are defined as follows:

       0    BGP4MP_STATE_CHANGE
       1    BGP4MP_MESSAGE
       2    BGP4MP_ENTRY
       3    BGP4MP_SNAPSHOT


4.8.1  BGP4MP_STATE_CHANGE Subtype

   This record is used to encode state changes in the BGP finite state
   machine.  As with the BGP_STATE_CHANGE Subtype, the BGP FSM states
   are encoded in the Old State and New State fields to indicate the
   previous and current state.  The format is illustrated below:





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        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Source AS number       |     Destination AS number     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Interface Index        |        Address Family         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                     Source IP address (variable)              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                   Destination IP address (variable)           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |            Old State          |          New State            |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   While BGP4MP_STATE_CHANGE message is similar to the BGP_STATE_CHANGE
   message, it also includes interface index and Address Family fields.
   The interface index provides the interface number of the peering
   session and the Address Family indicates what types of addresses are
   in the the address fields.  At present, only the following AFI types
   are supported:

       1    AFI_IPv4
       2    AFI_IPv6


4.8.2  BGP4MP_MESSAGE Subtype

   This Subtype is used to encode BGP Messages.  It is similar to the
   BGP_UPDATE subtype, except that is can be used to encode any type of
   message (not just BGP UPDATES).  In order to determine the BGP
   message type, the entire BGP message, including the BGP header, is
   included in the BGP Message field.  The BGP4MP_MESSAGE fields are
   shown below:

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Source AS number       |     Destination AS number     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Interface Index        |        Address Family         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                     Source IP address (variable)              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                   Destination IP address (variable)           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                    BGP Message... (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




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4.8.3  BGP4MP_ENTRY Subtype

   This Subtype is used to record routing table entries.  It is similar
   to the TABLE_DUMP Type.  The primary difference being that the
   Address Family is encoded in the Message itself.  Further, a
   Subsequence Address Family field (SAFI) is included as well.

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |           View #              |             Status            |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                        Time last change                       |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Address Family         |    SAFI       | Next-Hop-Len  |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                     Next Hop Address (variable)               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Prefix Length  |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                     Address Prefix (variable)                 |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |       Attribute Length        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                    BGP Attribute... (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


4.8.4  BGP4MP_SNAPSHOT Subtype

   This Subtype is used to indicate a filename containing BGP4MP_ENTRY
   records.  It is similar to the BGP_SYNC message subtype and shares
   the same fields.

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        View #                 |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |            File Name... (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


4.9  BGP4MP_ET

   This type was initially defined in the Sprint Labs Python Routing
   Toolkit (PyRT).  It extends the header field of the BGP4MP Type to
   include a 32-bit microsecond timestamp field.  The subtypes and other



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   field definitions remain as defined for the BGP4MP Type.  The 32-bit
   microsecond timestamp immediately follows the length field in the
   BGP4MP Type and precedes all other fields in the message.  The header
   modification is illustrated below.

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                           Timestamp                           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |             Type              |            Subtype            |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                             Length                            |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      microsecond timestamp                    |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                      Message... (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


4.10  ISIS

   This type was initially defined in the Sprint Labs Python Routing and
   supports the IS-IS routing protocol as defined in RFC 1195 [5].
   There is no type specific header for the ISIS Type.  The subtype code
   for this type is undefined.  The ISIS PDU directly follows the MRT
   common header fields.

4.11  ISIS_ET

   The ISIS_ET Type extends the the ISIS Type to support microsecond
   timestamps.  As with the BGP4MP_ET Type, a 32-bit microsecond
   timestamp field is appended to the MRT common header after the length
   field.  The ISIS_ET Type is otherwise identical to the ISIS Type.

4.12  OSPF_ET

   The OSPF_ET Type extends the the OSPF Type to support microsecond
   timestamps.  As with the BGP4MP_ET and ISIS_ET Types, a 32-bit
   microsecond timestamp field is appended to the MRT common header
   after the length field.  The OSPF_ET Type also extends the OSPF Type
   to support IPv6 addresses for the OSPFv3 protocol as defined in RFC
   2740 [6].  The format of the MRT Message field for the OSPF_ET Type
   is as follows:







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        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |        Address Family         |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                     Source IP address (variable)              |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                   Destination IP address (variable)           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                  OSPF Message Contents (variable)
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+








































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5.  Security Considerations

   The MRT Format utilizes a structure which can store routing protocol
   information data.  The fields defined in the MRT specification are of
   a descriptive nature and provide information that is useful to
   facilitate the analysis of routing data.  As such, the fields
   currently defined in the MRT specification do not in themselves
   create additional security risks, since the fields are not used to
   induce any particular behavior by the recipient application.










































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6.  References

6.1  Normative References

   [1]  Rekhter, Y. and T. Li, "A Border Gateway Protocol 4 (BGP-4)",
        RFC 1771, March 1995.

   [2]  Hedrick, C., "Routing Information Protocol", RFC 1058,
        June 1988.

   [3]  Malkin, G. and R. Minnear, "RIPng for IPv6", RFC 2080,
        January 1997.

   [4]  Moy, J., "OSPF Version 2", STD 54, RFC 2328, April 1998.

   [5]  Callon, R., "Use of OSI IS-IS for routing in TCP/IP and dual
        environments", RFC 1195, December 1990.

   [6]  Coltun, R., Ferguson, D., and J. Moy, "OSPF for IPv6", RFC 2740,
        December 1999.

   [7]  Bates, T., Rekhter, Y., Chandra, R., and D. Katz, "Multiprotocol
        Extensions for BGP-4", RFC 2858, June 2000.

6.2  Informative References

   [8]  "The MRT Programmers Manual", November 1999.


Authors' Addresses

   Larry Blunk
   Merit Network

   Email: ljb@merit.edu


   Manish Karir
   Merit Network

   Email: mkarir@merit.edu


   Craig Labovitz
   Arbor Networks

   Email: labovit@arbor.net




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