Network Working Group S. Willis Request for Comments: 1269 J. Burruss Wellfleet Communications Inc. October 1991
Definitions of Managed Objects for the Border Gateway Protocol (Version 3)
Status of this Memo
This memo is an extension to the SNMP MIB. This RFC specifies an IAB standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "IAB Official Protocol Standards" for the standardization state and status of this protocol. Distribution of this memo is unlimited.
1. 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 the Border Gateway Protocol [11,12].
2. The Network Management Framework
The Internet-standard Network Management Framework consists of three components. They are:
RFC 1155 which defines the SMI, the mechanisms used for describing and naming objects for the purpose of management. RFC 1212 defines a more concise description mechanism, which is wholly consistent with the SMI.
RFC 1156 which defines MIB-I, the core set of managed objects for the Internet suite of protocols. RFC 1213, defines MIB-II, an evolution of MIB-I based on implementation experience and new operational requirements.
RFC 1157 which defines the SNMP, the protocol used for network access to managed objects.
The Framework permits new objects to be defined for the purpose of experimentation and evaluation.
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3. Objects
Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the subset of Abstract Syntax Notation One (ASN.1) [7] defined in the SMI. In particular, each object has a name, a syntax, and an encoding. The name is an object identifier, an administratively assigned name, which specifies an object type. The object type together with an object instance serves to uniquely identify a specific instantiation of the object. For human convenience, we often use a textual string, termed the OBJECT DESCRIPTOR, to also refer to the object type.
The syntax of an object type defines the abstract data structure corresponding to that object type. The ASN.1 language is used for this purpose. However, the SMI [3] purposely restricts the ASN.1 constructs which may be used. These restrictions are explicitly made for simplicity.
The encoding of an object type is simply how that object type is represented using the object type's syntax. Implicitly tied to the notion of an object type's syntax and encoding is how the object type is represented when being transmitted on the network.
The SMI specifies the use of the basic encoding rules of ASN.1 [8], subject to the additional requirements imposed by the SNMP.
3.1. Format of Definitions
Section 5 contains contains the specification of all object types contained in this MIB module. The object types are defined using the conventions defined in the SMI, as amended by the extensions specified in [9,10].
4. Overview
These objects are used to control and manage a BGP [11,12] implementation.
The Border Gateway Protocol (BGP) is an inter-Autonomous System routing protocol. The primary function of a BGP speaking system is to exchange network reachability information with other BGP systems. This network reachability information includes information on the full path of Autonomous Systems that traffic must transit to reach these networks.
BGP runs over a reliable transport protocol. This eliminates the need to implement explicit update fragmentation, retransmission,
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acknowledgement, and sequencing. Any authentication scheme used by the transport protocol may be used in addition to BGP's own authentication mechanisms.
The planned use of BGP in the Internet environment, including such issues as topology, the interaction between BGP and IGPs, and the enforcement of routing policy rules is presented in a companion document [12].
Apart from a few system variables, this MIB is broken into two tables: the BGP Peer Table and the BGP Received Path Attribute Table. The Peer Table reflects information about BGP peer connections, such as their state and current activity. The Received Path Attribute Table contains all attributes received from all peers before local routing policy has been applied. The actual attributes used in determining a route are a subset of the received attribute table.
5. Definitions
RFC1269-MIB DEFINITIONS ::= BEGIN
IMPORTS NetworkAddress, IpAddress, Counter FROM RFC1155-SMI mib-2 FROM RFC1213-MIB OBJECT-TYPE FROM RFC-1212 TRAP-TYPE FROM RFC-1215;
-- This MIB module uses the extended OBJECT-TYPE macro as -- defined in [9], and the TRAP-TYPE macro as defined -- in [10].
bgp OBJECT IDENTIFIER ::= { mib-2 15 }
bgpVersion OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory DESCRIPTION "Vector of supported BGP protocol version numbers. Each peer negotiates the version from this vector. Versions are identified via the string of bits contained within this object. The first octet contains bits 0 to 7, the second octet contains bits 8 to 15, and so on,
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with the most significant bit referring to the lowest bit number in the octet (e.g., the MSB of the first octet refers to bit 0). If a bit, i, is present and set, then the version (i+1) of the BGP is supported." ::= { bgp 1 }
bgpLocalAs OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-only STATUS mandatory DESCRIPTION "The local autonomous system number." ::= { bgp 2 }
bgpPeerTable OBJECT-TYPE SYNTAX SEQUENCE OF BgpPeerEntry ACCESS not-accessible STATUS mandatory DESCRIPTION "The bgp peer table." ::= { bgp 3 }
bgpIdentifier OBJECT-TYPE SYNTAX IpAddress ACCESS read-only STATUS mandatory DESCRIPTION "The BGP Identifier of local system." ::= { bgp 4 }
bgpPeerEntry OBJECT-TYPE SYNTAX BgpPeerEntry ACCESS not-accessible STATUS mandatory DESCRIPTION "Information about a BGP peer connection." INDEX { bgpPeerRemoteAddr } ::= { bgpPeerTable 1 }
bgpPeerAdminStatus OBJECT-TYPE SYNTAX INTEGER ACCESS read-write STATUS mandatory DESCRIPTION "The desired state of the BGP connection. A transition from 'stop' to 'start' will cause the BGP Start Event to be generated. A transition from 'start' to 'stop' will cause the BGP Stop Event to be generated. This parameter can be used to restart BGP peer connections. Care should be used in providing write access to this object without adequate authentication." ::= { bgpPeerEntry 3 }
bgpPeerNegotiatedVersion OBJECT-TYPE SYNTAX INTEGER ACCESS read-only STATUS mandatory DESCRIPTION "The negotiated version of BGP running between the two peers. " ::= { bgpPeerEntry 4 }
bgpPeerLocalAddr OBJECT-TYPE SYNTAX IpAddress ACCESS read-only STATUS mandatory DESCRIPTION "The local IP address of this entry's BGP connection." ::= { bgpPeerEntry 5 }
bgpPeerLocalPort OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-only STATUS mandatory DESCRIPTION "The local port for the TCP connection between the BGP peers." ::= { bgpPeerEntry 6 }
bgpPeerRemoteAddr OBJECT-TYPE SYNTAX IpAddress ACCESS read-only STATUS mandatory DESCRIPTION
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"The remote IP address of this entry's BGP peer." ::= { bgpPeerEntry 7 }
bgpPeerRemotePort OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-only STATUS mandatory DESCRIPTION "The remote port for the TCP connection between the BGP peers. Note that the objects bgpLocalAddr, bgpLocalPort, bgpRemoteAddr and bgpRemotePort provide the appropriate reference to the standard MIB TCP connection table." ::= { bgpPeerEntry 8 }
bgpPeerRemoteAs OBJECT-TYPE SYNTAX INTEGER (0..65535) ACCESS read-only STATUS mandatory DESCRIPTION "The remote autonomous system number." ::= { bgpPeerEntry 9 }
bgpPeerInUpdates OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory DESCRIPTION "The number of BGP UPDATE messages received on this connection. This object should be initialized to zero when the connection is established." ::= { bgpPeerEntry 10 }
bgpPeerOutUpdates OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory DESCRIPTION "The number of BGP UPDATE messages received on this connection. This object should be initialized to zero when the connection is established." ::= { bgpPeerEntry 11}
bgpPeerInTotalMessages OBJECT-TYPE SYNTAX Counter
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ACCESS read-only STATUS mandatory DESCRIPTION "The total number of messages received from the remote peer on this connection. This object should be initialized to zero when the connection is established." ::= { bgpPeerEntry 12 }
bgpPeerOutTotalMessages OBJECT-TYPE SYNTAX Counter ACCESS read-only STATUS mandatory DESCRIPTION "The total number of messages transmitted to the remote peer on this connection. This object should be initialized to zero when the connection is established." ::= { bgpPeerEntry 13 }
bgpPeerLastError OBJECT-TYPE SYNTAX OCTET STRING (SIZE (2)) ACCESS read-only STATUS mandatory DESCRIPTION "The last error code and subcode seen by this peer on this connection. If no error has occurred, this field is zero. Otherwise, the first byte of this two byte OCTET STRING contains the error code; the second contains the subcode." ::= { bgpPeerEntry 14 }
bgpRcvdPathAttrTable OBJECT-TYPE SYNTAX SEQUENCE OF BgpPathAttrEntry ACCESS not-accessible STATUS mandatory DESCRIPTION "The BGP Received Path Attribute Table contains information about paths to destination networks received by all peers." ::= { bgp 5 }
bgpPathAttrEntry OBJECT-TYPE SYNTAX BgpPathAttrEntry ACCESS not-accessible STATUS mandatory DESCRIPTION
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"Information about a path to a network." INDEX { bgpPathAttrDestNetwork, bgpPathAttrPeer } ::= { bgpRcvdPathAttrTable 1 }
bgpPathAttrPeer OBJECT-TYPE SYNTAX IpAddress ACCESS read-only STATUS mandatory DESCRIPTION "The IP address of the peer where the path information was learned." ::= { bgpPathAttrEntry 1 }
bgpPathAttrDestNetwork OBJECT-TYPE SYNTAX IpAddress ACCESS read-only STATUS mandatory DESCRIPTION "The address of the destination network." ::= { bgpPathAttrEntry 2 }
bgpPathAttrOrigin OBJECT-TYPE SYNTAX INTEGER { igp(1),-- networks are interior egp(2),-- networks learned via EGP incomplete(3) -- undetermined } ACCESS read-only STATUS mandatory DESCRIPTION
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"The ultimate origin of the path information." ::= { bgpPathAttrEntry 3 }
bgpPathAttrASPath OBJECT-TYPE SYNTAX OCTET STRING ACCESS read-only STATUS mandatory DESCRIPTION "The set of ASs that must be traversed to reach the network. ( This object is probably best represented as SEQUENCE OF INTEGER. For SMI compatibility, though, it is represented as OCTET STRING. Each AS is represented as a pair of octets according to the following algorithm:
bgpPathAttrNextHop OBJECT-TYPE SYNTAX IpAddress ACCESS read-only STATUS mandatory DESCRIPTION "The address of the border router that should be used for the destination network." ::= { bgpPathAttrEntry 5 }
bgpPathAttrInterASMetric OBJECT-TYPE SYNTAX IpAddress ACCESS read-only STATUS mandatory DESCRIPTION "The optional inter-AS metric. If this attribute has not been provided for this route, the value for this object is 0." ::= { bgpPathAttrEntry 6 }
bgpEstablished TRAP-TYPE ENTERPRISE { bgp } VARIABLES { bgpPeerRemoteAddr, bgpPeerLastError, bgpPeerState } DESCRIPTION "The BGP Established event is generated when the BGP FSM enters the ESTABLISHED state. " ::= 1
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bgpBackwardTransition TRAP-TYPE ENTERPRISE { bgp } VARIABLES { bgpPeerRemoteAddr, bgpPeerLastError, bgpPeerState } DESCRIPTION "The BGPBackwardTransition Event is generated when the BGP FSM moves from a higher numbered state to a lower numbered state." ::= 2 END
6. Acknowledgements
We would like to acknowledge the assistance of all the members of the Interconnectivity Working Group, and particularly the following individuals:
Yakov Rekhter, IBM Rob Coltun, University of Maryland Guy Almes, Rice University Jeff Honig, Cornell Theory Center Marshall T. Rose, PSI, Inc. Dennis Ferguson, University of Toronto Mike Mathis, PSC
7. References
[1] Cerf, V., "IAB Recommendations for the Development of Internet Network Management Standards", RFC 1052, NRI, April 1988.
[2] Cerf, V., "Report of the Second Ad Hoc Network Management Review Group", RFC 1109, NRI, August 1989.
[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] McCloghrie K., and M. Rose, "Management Information Base for Network Management of TCP/IP-based internets", RFC 1156, Hughes LAN Systems, Performance Systems International, May 1990.
[5] 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.
[6] McCloghrie K., and M. Rose, Editors, "Management Information Base
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for Network Management of TCP/IP-based internets", RFC 1213, Performance Systems International, March 1991.
[7] Information processing systems - Open Systems Interconnection - Specification of Abstract Syntax Notation One (ASN.1), International Organization for Standardization, International Standard 8824, December 1987.
[8] Information processing systems - Open Systems Interconnection - Specification of Basic Encoding Rules for Abstract Notation One (ASN.1), International Organization for Standardization, International Standard 8825, December 1987.
[9] Rose, M., and K. McCloghrie, Editors, "Concise MIB Definitions", RFC 1212, Performance Systems International, Hughes LAN Systems, March 1991.
[10] Rose, M., Editor, "A Convention for Defining Traps for use with the SNMP", RFC 1215, Performance Systems International, March 1991.
[11] Lougheed, K., and Y. Rekhter, "A Border Gateway Protocol 3 (BGP- 3)", RFC 1267, cisco Systems, T.J. Watson Research Center, IBM Corp., October 1991.
[12] Rekhter, Y., and P. Gross, Editors, "Application of the Border Gateway Protocol in the Internet", RFC 1268, T.J. Watson Research Center, IBM Corp., ANS, October 1991.
8. Security Considerations
Security issues are not discussed in this memo.
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Authors' Addresses
Steven Willis Wellfleet Communications Inc. 15 Crosby Drive Bedford, MA 01730
