S. Hares, Ed.
NextHop Technologies
January 2006
Definitions of Managed Objects for BGP-4
Status of This Memo
-
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
-
Copyright © The Internet Society (2006).
Abstract
-
This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community In particular, it describes managed objects used for managing the Border Gateway Protocol Version 4 or lower.
The origin of this memo is from RFC 1269 "Definitions of Managed Objects for the Border Gateway Protocol (Version 3)", which was updated to support BGP-4 in RFC 1657. This memo fixes errors introduced when the MIB module was converted to use the SMIv2 language. This memo also updates references to the current SNMP framework documents.
This memo is intended to document deployed implementations of this MIB module in a historical context, to provide clarifications of some items, and to note errors where the MIB module fails to fully represent the BGP protocol. Work is currently in progress to replace this MIB module with a new one representing the current state of the BGP protocol and its extensions.
Table of Contents
-
1. Introduction ....................................................2 2. The Internet-Standard Management Framework ......................2 3. Overview ........................................................2 4. Definitions .....................................................3 5. Security Considerations ........................................28 6. Acknowledgements ...............................................30 7. Normative References ...........................................31
1. Introduction
-
This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes managed objects used for managing the Border Gateway Protocol Version 4 or lower [BGP4, BGP4APP].
2. The Internet-Standard Management Framework
-
For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of RFC 3410 [RFC3410].
Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP). Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580 [RFC2580].
3. Overview
-
These objects are used to control and manage a BGP-4 implementation.
Apart from a few system-wide scalar objects, this MIB is broken into three tables: the BGP Peer Table, the BGP Received Path Attribute Table, and the BGP-4 Received Path Attribute Table. The BGP Peer Table contains information about state and current activity of connections with the BGP peers. The BGP Received Path Attribute Table contains path attributes received from all peers running BGP version 3 or less. The BGP-4 Received Path Attribute Table contains path attributes received from all BGP-4 peers. The actual attributes used in determining a route are a subset of the received attribute tables after local routing policy has been applied.
4. Definitions
-
BGP4-MIB DEFINITIONS ::= BEGIN
-
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE, IpAddress, Integer32, Counter32, Gauge32, mib-2 FROM SNMPv2-SMI MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP FROM SNMPv2-CONF;-
bgp MODULE-IDENTITY
-
LAST-UPDATED "200601110000Z"
ORGANIZATION "IETF IDR Working Group" CONTACT-INFO "E-mail: idr@ietf.org
Jeffrey Haas, Susan Hares (Editors) NextHop Technologies 825 Victors Way Suite 100 Ann Arbor, MI 48108-2738 Tel: +1 734 222-1600 Fax: +1 734 222-1602 E-mail: jhaas@nexthop.com skh@nexthop.com"1) Fixed the definitions of the notifications to make them equivalent to their initial definition in RFC 1269. 2) Added compliance and conformance info. 3) Updated information for the values of bgpPeerNegotiatedVersion, bgp4PathAttrLocalPref, bgp4PathAttrCalcLocalPref, bgp4PathAttrMultiExitDisc, bgp4PathAttrASPathSegement. 4) Added additional clarification comments where needed. 5) Noted where objects do not fully reflect the protocol as Known Issues. 6) Updated the DESCRIPTION for the bgp4PathAttrAtomicAggregate object. 7) The following objects have had their DESCRIPTION clause modified to remove the text that suggested (using 'should' verb) initializing the counter to zero on a transition to the established state: bgpPeerInUpdates, bgpPeerOutUpdates, bgpPeerInTotalMessages, bgpPeerOutTotalMessages Those implementations that still do this are still compliant with this new wording. Applications should not assume counters have started at zero.REVISION "199110261839Z" DESCRIPTION "Initial version, published as RFC 1269." ::= { mib-2 15 }-
bgpVersion OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (1..255)) MAX-ACCESS read-only STATUS current 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, 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." REFERENCE "RFC 4271, Section 4.2." ::= { bgp 1 } bgpLocalAs OBJECT-TYPE SYNTAX Integer32 (0..65535) MAX-ACCESS read-only STATUS current DESCRIPTION "The local autonomous system number." REFERENCE "RFC 4271, Section 4.2, 'My Autonomous System'." ::= { bgp 2 }-
-- BGP Peer table. This table contains, one entry per -- BGP peer, information about the BGP peer.
bgpPeerTable OBJECT-TYPE
SYNTAX SEQUENCE OF BgpPeerEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "BGP peer table. This table contains, one entry per BGP peer, information about the connections with BGP peers." ::= { bgp 3 }-
bgpPeerEntry OBJECT-TYPE
SYNTAX BgpPeerEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Entry containing information about the connection with a BGP peer." INDEX { bgpPeerRemoteAddr } ::= { bgpPeerTable 1 }-
BgpPeerEntry ::= SEQUENCE {
bgpPeerIdentifier IpAddress, bgpPeerState INTEGER, bgpPeerAdminStatus INTEGER, bgpPeerNegotiatedVersion Integer32, bgpPeerLocalAddr IpAddress, bgpPeerLocalPort Integer32, bgpPeerRemoteAddr IpAddress, bgpPeerRemotePort Integer32, bgpPeerRemoteAs Integer32, bgpPeerInUpdates Counter32, bgpPeerOutUpdates Counter32, bgpPeerInTotalMessages Counter32, bgpPeerOutTotalMessages Counter32, bgpPeerLastError OCTET STRING, bgpPeerFsmEstablishedTransitions Counter32, bgpPeerFsmEstablishedTime Gauge32, bgpPeerConnectRetryInterval Integer32, bgpPeerHoldTime Integer32, bgpPeerKeepAlive Integer32, bgpPeerHoldTimeConfigured Integer32, bgpPeerKeepAliveConfigured Integer32, bgpPeerMinASOriginationInterval Integer32, bgpPeerMinRouteAdvertisementInterval Integer32, bgpPeerInUpdateElapsedTime Gauge32 }-
bgpPeerIdentifier OBJECT-TYPE
SYNTAX IpAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The BGP Identifier of this entry's BGP peer. This entry MUST be 0.0.0.0 unless the bgpPeerState is in the openconfirm or the established state." REFERENCE "RFC 4271, Section 4.2, 'BGP Identifier'." ::= { bgpPeerEntry 1 }-
bgpPeerState OBJECT-TYPE
SYNTAX INTEGER { idle(1), connect(2), active(3), opensent(4), openconfirm(5), established(6) } MAX-ACCESS read-only STATUS current DESCRIPTION "The BGP peer connection state." REFERENCE "RFC 4271, Section 8.2.2." ::= { bgpPeerEntry 2 }-
bgpPeerAdminStatus OBJECT-TYPE
SYNTAX INTEGER { stop(1), start(2) } MAX-ACCESS read-write STATUS current DESCRIPTION "The desired state of the BGP connection. A transition from 'stop' to 'start' will cause the BGP Manual Start Event to be generated. A transition from 'start' to 'stop' will cause the BGP Manual 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." REFERENCE "RFC 4271, Section 8.1.2." ::= { bgpPeerEntry 3 }-
bgpPeerNegotiatedVersion OBJECT-TYPE
SYNTAX Integer32 MAX-ACCESS read-only STATUS current DESCRIPTION "The negotiated version of BGP running between the two peers.-
-
-
-
-
This entry MUST be zero (0) unless the bgpPeerState is in the openconfirm or the established state.
-
-
-
-
Note that legal values for this object are between 0 and 255." REFERENCE "RFC 4271, Section 4.2. RFC 4271, Section 7." ::= { bgpPeerEntry 4 }-
bgpPeerLocalAddr OBJECT-TYPE
SYNTAX IpAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The local IP address of this entry's BGP connection." ::= { bgpPeerEntry 5 }-
bgpPeerLocalPort OBJECT-TYPE
SYNTAX Integer32 (0..65535) MAX-ACCESS read-only STATUS current DESCRIPTION "The local port for the TCP connection between the BGP peers." ::= { bgpPeerEntry 6 }-
bgpPeerRemoteAddr OBJECT-TYPE
SYNTAX IpAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The remote IP address of this entry's BGP peer." ::= { bgpPeerEntry 7 }-
bgpPeerRemotePort OBJECT-TYPE
SYNTAX Integer32 (0..65535) MAX-ACCESS read-only STATUS current DESCRIPTION "The remote port for the TCP connection between the BGP peers. Note that the objects bgpPeerLocalAddr, bgpPeerLocalPort, bgpPeerRemoteAddr, and bgpPeerRemotePort provide the appropriate reference to the standard MIB TCP connection table." ::= { bgpPeerEntry 8 }-
bgpPeerRemoteAs OBJECT-TYPE
SYNTAX Integer32 (0..65535) MAX-ACCESS read-only STATUS current DESCRIPTION "The remote autonomous system number received in the BGP OPEN message." REFERENCE "RFC 4271, Section 4.2." ::= { bgpPeerEntry 9 }-
bgpPeerInUpdates OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of BGP UPDATE messages received on this connection." REFERENCE "RFC 4271, Section 4.3." ::= { bgpPeerEntry 10 }-
bgpPeerOutUpdates OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of BGP UPDATE messages transmitted on this connection." REFERENCE "RFC 4271, Section 4.3." ::= { bgpPeerEntry 11 }-
bgpPeerInTotalMessages OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of messages received from the remote peer on this connection." REFERENCE "RFC 4271, Section 4." ::= { bgpPeerEntry 12 }-
bgpPeerOutTotalMessages OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of messages transmitted to the remote peer on this connection." REFERENCE "RFC 4271, Section 4." ::= { bgpPeerEntry 13 }-
bgpPeerLastError OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (2)) MAX-ACCESS read-only STATUS current 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, and the second byte contains the subcode." REFERENCE "RFC 4271, Section 4.5." ::= { bgpPeerEntry 14 }-
bgpPeerFsmEstablishedTransitions OBJECT-TYPE
SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of times the BGP FSM transitioned into the established state for this peer." REFERENCE "RFC 4271, Section 8." ::= { bgpPeerEntry 15 }-
bgpPeerFsmEstablishedTime OBJECT-TYPE
SYNTAX Gauge32 UNITS "seconds" MAX-ACCESS read-only STATUS current DESCRIPTION "This timer indicates how long (in seconds) this peer has been in the established state or how long since this peer was last in the established state. It is set to zero when a new peer is configured or when the router is booted." REFERENCE "RFC 4271, Section 8." ::= { bgpPeerEntry 16 }-
bgpPeerConnectRetryInterval OBJECT-TYPE
SYNTAX Integer32 (1..65535) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "Time interval (in seconds) for the ConnectRetry timer. The suggested value for this timer is 120 seconds." REFERENCE "RFC 4271, Section 8.2.2. This is the value used to initialize the 'ConnectRetryTimer'." ::= { bgpPeerEntry 17 }-
bgpPeerHoldTime OBJECT-TYPE
SYNTAX Integer32 ( 0 | 3..65535 ) UNITS "seconds" MAX-ACCESS read-only STATUS current DESCRIPTION "Time interval (in seconds) for the Hold Timer established with the peer. The value of this object is calculated by this BGP speaker, using the smaller of the values in bgpPeerHoldTimeConfigured and the Hold Time received in the OPEN message.-
-
-
-
-
This value must be at least three seconds if it is not zero (0).
If the Hold Timer has not been established with the peer this object MUST have a value of zero (0).
-
-
-
-
If the bgpPeerHoldTimeConfigured object has a value of (0), then this object MUST have a value of (0)." REFERENCE "RFC 4271, Section 4.2." ::= { bgpPeerEntry 18 }-
bgpPeerKeepAlive OBJECT-TYPE
SYNTAX Integer32 ( 0 | 1..21845 ) UNITS "seconds" MAX-ACCESS read-only STATUS current DESCRIPTION "Time interval (in seconds) for the KeepAlive timer established with the peer. The value of this object is calculated by this BGP speaker such that, when compared with bgpPeerHoldTime, it has the same proportion that bgpPeerKeepAliveConfigured has, compared with bgpPeerHoldTimeConfigured.-
-
-
-
-
If the KeepAlive timer has not been established with the peer, this object MUST have a value of zero (0).
-
-
-
-
If the of bgpPeerKeepAliveConfigured object has a value of (0), then this object MUST have a value of (0)." REFERENCE "RFC 4271, Section 4.4." ::= { bgpPeerEntry 19 }-
bgpPeerHoldTimeConfigured OBJECT-TYPE
SYNTAX Integer32 ( 0 | 3..65535 ) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "Time interval (in seconds) for the Hold Time configured for this BGP speaker with this peer. This value is placed in an OPEN message sent to this peer by this BGP speaker, and is compared with the Hold Time field in an OPEN message received from the peer when determining the Hold Time (bgpPeerHoldTime) with the peer. This value must not be less than three seconds if it is not zero (0). If it is zero (0), the Hold Time is NOT to be established with the peer. The suggested value for this timer is 90 seconds." REFERENCE "RFC 4271, Section 4.2. RFC 4271, Section 10." ::= { bgpPeerEntry 20 } bgpPeerKeepAliveConfigured OBJECT-TYPE SYNTAX Integer32 ( 0 | 1..21845 ) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "Time interval (in seconds) for the KeepAlive timer configured for this BGP speaker with this peer. The value of this object will only determine the KEEPALIVE messages' frequency relative to the value specified in bgpPeerHoldTimeConfigured; the actual time interval for the KEEPALIVE messages is indicated by bgpPeerKeepAlive. A reasonable maximum value for this timer would be one third of that of bgpPeerHoldTimeConfigured. If the value of this object is zero (0), no periodical KEEPALIVE messages are sent to the peer after the BGP connection has been established. The suggested value for this timer is 30 seconds." REFERENCE "RFC 4271, Section 4.4. RFC 4271, Section 10." ::= { bgpPeerEntry 21 }-
bgpPeerMinASOriginationInterval OBJECT-TYPE
SYNTAX Integer32 (1..65535) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "Time interval (in seconds) for the MinASOriginationInterval timer. The suggested value for this timer is 15 seconds." REFERENCE "RFC 4271, Section 9.2.1.2. RFC 4271, Section 10." ::= { bgpPeerEntry 22 }-
bgpPeerMinRouteAdvertisementInterval OBJECT-TYPE
SYNTAX Integer32 (1..65535) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "Time interval (in seconds) for the MinRouteAdvertisementInterval timer. The suggested value for this timer is 30 seconds for EBGP connections and 5 seconds for IBGP connections." REFERENCE "RFC 4271, Section 9.2.1.1. RFC 4271, Section 10." ::= { bgpPeerEntry 23 }-
bgpPeerInUpdateElapsedTime OBJECT-TYPE
SYNTAX Gauge32 UNITS "seconds" MAX-ACCESS read-only STATUS current DESCRIPTION "Elapsed time (in seconds) since the last BGP UPDATE message was received from the peer. Each time bgpPeerInUpdates is incremented, the value of this object is set to zero (0)." REFERENCE "RFC 4271, Section 4.3. RFC 4271, Section 8.2.2, Established state." ::= { bgpPeerEntry 24 }-
bgpIdentifier OBJECT-TYPE
SYNTAX IpAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The BGP Identifier of the local system." REFERENCE "RFC 4271, Section 4.2." ::= { bgp 4 }-
-- BGP Received Path Attribute Table. This table contains -- one entry per path to a network, and path attributes -- received from all peers running BGP version 3 or less. -- This table is obsolete, having been replaced in -- functionality by the bgp4PathAttrTable.
bgpRcvdPathAttrTable OBJECT-TYPE
SYNTAX SEQUENCE OF BgpPathAttrEntry MAX-ACCESS not-accessible STATUS obsolete DESCRIPTION "The BGP Received Path Attribute Table contains information about paths to destination networks, received from all peers running BGP version 3 or less." ::= { bgp 5 }-
bgpPathAttrEntry OBJECT-TYPE
SYNTAX BgpPathAttrEntry MAX-ACCESS not-accessible STATUS obsolete DESCRIPTION "Information about a path to a network." INDEX { bgpPathAttrDestNetwork, bgpPathAttrPeer } ::= { bgpRcvdPathAttrTable 1 } BgpPathAttrEntry ::= SEQUENCE { bgpPathAttrPeer IpAddress, bgpPathAttrDestNetwork IpAddress, bgpPathAttrOrigin INTEGER, bgpPathAttrASPath OCTET STRING, bgpPathAttrNextHop IpAddress, bgpPathAttrInterASMetric Integer32 }-
bgpPathAttrPeer OBJECT-TYPE
SYNTAX IpAddress MAX-ACCESS read-only STATUS obsolete DESCRIPTION "The IP address of the peer where the path information was learned." ::= { bgpPathAttrEntry 1 }-
bgpPathAttrDestNetwork OBJECT-TYPE
SYNTAX IpAddress MAX-ACCESS read-only STATUS obsolete DESCRIPTION "The address of the destination network." REFERENCE "RFC 1267, Section 4.3." ::= { bgpPathAttrEntry 2 }-
bgpPathAttrOrigin OBJECT-TYPE
SYNTAX INTEGER { igp(1),-- networks are interior egp(2),-- networks learned via the -- EGP protocol incomplete(3) -- networks that -- are learned by some other -- means } MAX-ACCESS read-only STATUS obsolete DESCRIPTION "The ultimate origin of the path information." REFERENCE "RFC 1267, Section 4.3. RFC 1267, Section 5." ::= { bgpPathAttrEntry 3 }-
bgpPathAttrASPath OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (2..255)) MAX-ACCESS read-only STATUS obsolete DESCRIPTION "The set of ASes 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: first-byte-of-pair = ASNumber / 256; second-byte-of-pair = ASNumber & 255;" REFERENCE "RFC 1267, Section 4.3. RFC 1267, Section 5." ::= { bgpPathAttrEntry 4 }-
bgpPathAttrNextHop OBJECT-TYPE
SYNTAX IpAddress MAX-ACCESS read-only STATUS obsolete DESCRIPTION "The address of the border router that should be used for the destination network." REFERENCE "RFC 1267, Section 4.3. RFC 1267, Section 5." ::= { bgpPathAttrEntry 5 }-
bgpPathAttrInterASMetric OBJECT-TYPE
SYNTAX Integer32 MAX-ACCESS read-only STATUS obsolete DESCRIPTION "The optional inter-AS metric. If this attribute has not been provided for this route, the value for this object is 0." REFERENCE "RFC 1267, Section 4.3. RFC 1267, Section 5." ::= { bgpPathAttrEntry 6 } -
-- BGP-4 Received Path Attribute Table. This table
-- contains one entry per path to a network, and path
-- attributes received from all peers running BGP-4.
-
-
bgp4PathAttrTable OBJECT-TYPE
SYNTAX SEQUENCE OF Bgp4PathAttrEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The BGP-4 Received Path Attribute Table contains information about paths to destination networks, received from all BGP4 peers." ::= { bgp 6 }-
bgp4PathAttrEntry OBJECT-TYPE
SYNTAX Bgp4PathAttrEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Information about a path to a network." INDEX { bgp4PathAttrIpAddrPrefix, bgp4PathAttrIpAddrPrefixLen, bgp4PathAttrPeer } ::= { bgp4PathAttrTable 1 }-
Bgp4PathAttrEntry ::= SEQUENCE {
bgp4PathAttrPeer IpAddress, bgp4PathAttrIpAddrPrefixLen Integer32, bgp4PathAttrIpAddrPrefix IpAddress, bgp4PathAttrOrigin INTEGER, bgp4PathAttrASPathSegment OCTET STRING, bgp4PathAttrNextHop IpAddress, bgp4PathAttrMultiExitDisc Integer32, bgp4PathAttrLocalPref Integer32, bgp4PathAttrAtomicAggregate INTEGER, bgp4PathAttrAggregatorAS Integer32, bgp4PathAttrAggregatorAddr IpAddress, bgp4PathAttrCalcLocalPref Integer32, bgp4PathAttrBest INTEGER, bgp4PathAttrUnknown OCTET STRING }-
bgp4PathAttrPeer OBJECT-TYPE
SYNTAX IpAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The IP address of the peer where the path information was learned." ::= { bgp4PathAttrEntry 1 }-
bgp4PathAttrIpAddrPrefixLen OBJECT-TYPE
SYNTAX Integer32 (0..32) MAX-ACCESS read-only STATUS current DESCRIPTION "Length in bits of the IP address prefix in the Network Layer Reachability Information field." ::= { bgp4PathAttrEntry 2 }-
bgp4PathAttrIpAddrPrefix OBJECT-TYPE
SYNTAX IpAddress MAX-ACCESS read-only STATUS current DESCRIPTION "An IP address prefix in the Network Layer Reachability Information field. This object is an IP address containing the prefix with length specified by bgp4PathAttrIpAddrPrefixLen. Any bits beyond the length specified by bgp4PathAttrIpAddrPrefixLen are zeroed." REFERENCE "RFC 4271, Section 4.3." ::= { bgp4PathAttrEntry 3 }-
bgp4PathAttrOrigin OBJECT-TYPE
SYNTAX INTEGER { igp(1),-- networks are interior egp(2),-- networks learned via the -- EGP protocol incomplete(3) -- networks that -- are learned by some other -- means } MAX-ACCESS read-only STATUS current DESCRIPTION "The ultimate origin of the path information." REFERENCE "RFC 4271, Section 4.3. RFC 4271, Section 5.1.1." ::= { bgp4PathAttrEntry 4 }-
bgp4PathAttrASPathSegment OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (2..255)) MAX-ACCESS read-only STATUS current DESCRIPTION "The sequence of AS path segments. Each AS path segment is represented by a triple <type, length, value>.-
-
-
-
-
The type is a 1-octet field that has two possible values:
-
-
-
-
1 AS_SET: unordered set of ASes that a route in the UPDATE message has traversed 2 AS_SEQUENCE: ordered set of ASes that a route in the UPDATE message has traversed.-
-
-
-
-
The length is a 1-octet field containing the
-
-
-
-
-
number of ASes in the value field.
-
-
-
-
-
-
The value field contains one or more AS numbers. Each AS is represented in the octet string as a pair of octets according to the following algorithm:
-
-
-
-
first-byte-of-pair = ASNumber / 256; second-byte-of-pair = ASNumber & 255; Known Issues: o BGP Confederations will result in a type of either 3 or 4. o An AS Path may be longer than 255 octets. This may result in this object containing a truncated AS Path." REFERENCE "RFC 4271, Section 4.3. RFC 4271, Section 5.1.2." ::= { bgp4PathAttrEntry 5 }-
bgp4PathAttrNextHop OBJECT-TYPE
SYNTAX IpAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The address of the border router that should be used for the destination network. This address is the NEXT_HOP address received in the UPDATE packet." REFERENCE "RFC 4271, Section 4.3. RFC 4271, Section 5.1.3." ::= { bgp4PathAttrEntry 6 }-
bgp4PathAttrMultiExitDisc OBJECT-TYPE
SYNTAX Integer32 (-1..2147483647) MAX-ACCESS read-only STATUS current DESCRIPTION "This metric is used to discriminate between multiple exit points to an adjacent autonomous system. A value of -1 indicates the absence of this attribute.-
-
-
-
-
Known Issues:
o The BGP-4 specification uses anunsigned 32 bit number. Thus, this
-
-
-
-
object cannot represent the full range of the protocol." REFERENCE "RFC 4271, Section 4.3. RFC 4271, Section 5.1.4." ::= { bgp4PathAttrEntry 7 }-
bgp4PathAttrLocalPref OBJECT-TYPE
SYNTAX Integer32 (-1..2147483647) MAX-ACCESS read-only STATUS current DESCRIPTION "The originating BGP4 speaker's degree of preference for an advertised route. A value of -1 indicates the absence of this attribute. Known Issues: o The BGP-4 specification uses an unsigned 32 bit number and thus this object cannot represent the full range of the protocol." REFERENCE "RFC 4271, Section 4.3. RFC 4271, Section 5.1.5." ::= { bgp4PathAttrEntry 8 }-
bgp4PathAttrAtomicAggregate OBJECT-TYPE
SYNTAX INTEGER { lessSpecificRouteNotSelected(1), -- Typo corrected from RFC 1657 lessSpecificRouteSelected(2) } MAX-ACCESS read-only STATUS current DESCRIPTION "If the ATOMIC_AGGREGATE attribute is present in the Path Attributes then this object MUST have a value of 'lessSpecificRouteNotSelected'.-
-
-
-
-
If the ATOMIC_AGGREGATE attribute is missing in the Path Attributes then this object MUST have a value of 'lessSpecificRouteSelected'.
-
-
-
-
Note that ATOMIC_AGGREGATE is now a primarily informational attribute." REFERENCE "RFC 4271, Sections 5.1.6 and 9.1.4." ::= { bgp4PathAttrEntry 9 }-
bgp4PathAttrAggregatorAS OBJECT-TYPE
SYNTAX Integer32 (0..65535) MAX-ACCESS read-only STATUS current DESCRIPTION "The AS number of the last BGP4 speaker that performed route aggregation. A value of zero (0) indicates the absence of this attribute. Note that propagation of AS of zero is illegal in the Internet." REFERENCE "RFC 4271, Section 5.1.7. RFC 4271, Section 9.2.2.2." ::= { bgp4PathAttrEntry 10 }-
bgp4PathAttrAggregatorAddr OBJECT-TYPE
SYNTAX IpAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The IP address of the last BGP4 speaker that performed route aggregation. A value of 0.0.0.0 indicates the absence of this attribute." REFERENCE "RFC 4271, Section 5.1.7. RFC 4271, Section 9.2.2.2." ::= { bgp4PathAttrEntry 11 }-
bgp4PathAttrCalcLocalPref OBJECT-TYPE
SYNTAX Integer32 (-1..2147483647) MAX-ACCESS read-only STATUS current DESCRIPTION "The degree of preference calculated by the receiving BGP4 speaker for an advertised route. A value of -1 indicates the absence of this attribute.-
-
-
-
-
Known Issues:
o The BGP-4 specification uses anunsigned 32 bit number and thus this object cannot represent the full
range of the protocol."
-
-
-
-
REFERENCE "RFC 4271, Section 9.1.1." ::= { bgp4PathAttrEntry 12 }-
bgp4PathAttrBest OBJECT-TYPE
SYNTAX INTEGER { false(1),-- not chosen as best route true(2) -- chosen as best route } MAX-ACCESS read-only STATUS current DESCRIPTION "An indication of whether this route was chosen as the best BGP4 route for this destination." REFERENCE "RFC 4271, Section 9.1.2." ::= { bgp4PathAttrEntry 13 }-
bgp4PathAttrUnknown OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(0..255)) MAX-ACCESS read-only STATUS current DESCRIPTION "One or more path attributes not understood by this BGP4 speaker.-
-
-
-
-
Path attributes are recorded in the Update Path attribute format of type, length, value.
Size zero (0) indicates the absence of such attributes.
Octets beyond the maximum size, if any, are not recorded by this object.
-
-
-
-
Known Issues: o Attributes understood by this speaker, but not represented in this MIB, are unavailable to the agent." REFERENCE "RFC 4271, Section 5." ::= { bgp4PathAttrEntry 14 }-
-- Traps.
-- Note that in RFC 1657, bgpTraps was incorrectly -- assigned a value of { bgp 7 } and each of the
-- traps had the bgpPeerRemoteAddr object inappropriately
-
-- removed from their OBJECTS clause. The following
-- definitions restore the semantics of the traps as
-- they were initially defined in RFC 1269.
-
bgpNotification OBJECT IDENTIFIER ::= { bgp 0 }-
bgpEstablishedNotification NOTIFICATION-TYPE
OBJECTS { bgpPeerRemoteAddr, bgpPeerLastError, bgpPeerState } STATUS current DESCRIPTION "The bgpEstablishedNotification event is generated when the BGP FSM enters the established state. This Notification replaces the bgpEstablished Notification." ::= { bgpNotification 1 }-
bgpBackwardTransNotification NOTIFICATION-TYPE
OBJECTS { bgpPeerRemoteAddr, bgpPeerLastError, bgpPeerState } STATUS current DESCRIPTION "The bgpBackwardTransNotification event is generated when the BGP FSM moves from a higher numbered state to a lower numbered state. This Notification replaces the bgpBackwardsTransition Notification." ::= { bgpNotification 2 } -
-- { bgp 7 } is deprecated. Do not allocate new objects or
-- notifications underneath this branch.
-
bgpTraps OBJECT IDENTIFIER ::= { bgp 7 } -- deprecated-
bgpEstablished NOTIFICATION-TYPE
OBJECTS { bgpPeerLastError, bgpPeerState } STATUS deprecated DESCRIPTION "The bgpEstablished event is generated when the BGP FSM enters the established state.-
-
-
-
-
This Notification has been replaced by the bgpEstablishedNotification Notification."
-
-
-
-
::= { bgpTraps 1 }-
bgpBackwardTransition NOTIFICATION-TYPE
OBJECTS { bgpPeerLastError, bgpPeerState } STATUS deprecated DESCRIPTION "The bgpBackwardTransition event is generated when the BGP FSM moves from a higher numbered state to a lower numbered state. This Notification has been replaced by the bgpBackwardTransNotification Notification." ::= { bgpTraps 2 } -- Conformance information bgp4MIBConformance OBJECT IDENTIFIER ::= { bgp 8 } bgp4MIBCompliances OBJECT IDENTIFIER ::= { bgp4MIBConformance 1 } bgp4MIBGroups OBJECT IDENTIFIER ::= { bgp4MIBConformance 2 } -- Compliance statements-
bgp4MIBCompliance MODULE-COMPLIANCE
STATUS current DESCRIPTION "The compliance statement for entities which implement the BGP4 mib." MODULE -- this module MANDATORY-GROUPS { bgp4MIBGlobalsGroup, bgp4MIBPeerGroup, bgp4MIBPathAttrGroup } GROUP bgp4MIBNotificationGroup DESCRIPTION "Implementation of BGP Notifications are completely optional in this MIB." ::= { bgp4MIBCompliances 1 }-
bgp4MIBDeprecatedCompliances MODULE-COMPLIANCE
STATUS deprecated DESCRIPTION "The compliance statement documenting deprecated objects in the BGP4 mib." MODULE -- this module GROUP bgp4MIBTrapGroup DESCRIPTION "Group containing TRAP objects that were improperly converted from SMIv1 in RFC 1657. The proper semantics have been restored with the objects in bgp4MIBNotificationGroup." ::= { bgp4MIBCompliances 2 }-
bgp4MIBObsoleteCompliances MODULE-COMPLIANCE
STATUS obsolete DESCRIPTION "The compliance statement documenting obsolete objects in the BGP4 mib." MODULE -- this module GROUP bgpRcvdPathAttrGroup DESCRIPTION "Group containing objects relevant to BGP-3 and earlier objects." ::= { bgp4MIBCompliances 3 }-
-- Units of conformance
bgp4MIBGlobalsGroup OBJECT-GROUP
OBJECTS { bgpVersion, bgpLocalAs, bgpIdentifier } STATUS current DESCRIPTION "A collection of objects providing information on global BGP state." ::= { bgp4MIBGroups 1 }-
bgp4MIBPeerGroup OBJECT-GROUP
-
OBJECTS { bgpPeerIdentifier,
bgpPeerState, bgpPeerAdminStatus, bgpPeerNegotiatedVersion, bgpPeerLocalAddr, bgpPeerLocalPort, bgpPeerRemoteAddr, bgpPeerRemotePort, bgpPeerRemoteAs, bgpPeerInUpdates, bgpPeerOutUpdates, bgpPeerInTotalMessages, bgpPeerOutTotalMessages, bgpPeerLastError, bgpPeerFsmEstablishedTransitions, bgpPeerFsmEstablishedTime, bgpPeerConnectRetryInterval, bgpPeerHoldTime, bgpPeerKeepAlive, bgpPeerHoldTimeConfigured, bgpPeerKeepAliveConfigured, bgpPeerMinASOriginationInterval, bgpPeerMinRouteAdvertisementInterval, bgpPeerInUpdateElapsedTime } STATUS current DESCRIPTION "A collection of objects for managing BGP peers." ::= { bgp4MIBGroups 2 }-
bgpRcvdPathAttrGroup OBJECT-GROUP
OBJECTS { bgpPathAttrPeer, bgpPathAttrDestNetwork, bgpPathAttrOrigin, bgpPathAttrASPath, bgpPathAttrNextHop, bgpPathAttrInterASMetric } STATUS obsolete DESCRIPTION "A collection of objects for managing BGP-3 and earlier path entries. This conformance group, like BGP-3, is obsolete." ::= { bgp4MIBGroups 3 }-
bgp4MIBPathAttrGroup OBJECT-GROUP
OBJECTS { bgp4PathAttrPeer, bgp4PathAttrIpAddrPrefixLen, bgp4PathAttrIpAddrPrefix, bgp4PathAttrOrigin, bgp4PathAttrASPathSegment, bgp4PathAttrNextHop, bgp4PathAttrMultiExitDisc, bgp4PathAttrLocalPref, bgp4PathAttrAtomicAggregate, bgp4PathAttrAggregatorAS, bgp4PathAttrAggregatorAddr, bgp4PathAttrCalcLocalPref, bgp4PathAttrBest, bgp4PathAttrUnknown } STATUS current DESCRIPTION "A collection of objects for managing BGP path entries." ::= { bgp4MIBGroups 4 }-
bgp4MIBTrapGroup NOTIFICATION-GROUP
NOTIFICATIONS { bgpEstablished, bgpBackwardTransition } STATUS deprecated DESCRIPTION "A collection of notifications for signaling changes in BGP peer relationships. Obsoleted by bgp4MIBNotificationGroup" ::= { bgp4MIBGroups 5 }-
bgp4MIBNotificationGroup NOTIFICATION-GROUP
NOTIFICATIONS { bgpEstablishedNotification, bgpBackwardTransNotification } STATUS current DESCRIPTION "A collection of notifications for signaling changes in BGP peer relationships. Obsoletes bgp4MIBTrapGroup." ::= { bgp4MIBGroups 6 } END -
5. Security Considerations
-
This MIB relates to a system providing inter-domain routing. As such, improper manipulation of the objects represented by this MIB may result in denial of service to a large number of end-users.
There are several management objects defined in this MIB that have a MAX-ACCESS clause of read-write and/or read-create. Such objects should be considered sensitive or vulnerable in most network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. These objects include:
- bgpPeerAdminStatus
-
Improper change of bgpPeerAdminStatus, from start to stop, can cause significant disruption of the connectivity to those portions of the Internet reached via the applicable remote BGP peer.
- bgpPeerConnectRetryInterval
Improper change of this object can cause connections to be
disrupted for extremely long time periods when otherwise they
would be restored in a relatively short period of time.
-
- bgpPeerHoldTimeConfigured, bgpPeerKeepAliveConfigured
-
Misconfiguration of these objects can make BGP sessions more fragile and less resilient to denial of service attacks on the inter-domain routing system.
- bgpPeerMinASOriginationInterval, bgpPeerMinRouteAdvertisementInterval
-
Misconfiguration of these objects may adversely affect global Internet convergence of the routes advertised by this BGP speaker. This may result in long-lived routing loops and blackholes for the portions of the Internet that utilize these routes.
There are a number of managed objects in this MIB that contain sensitive information regarding the operation of a network. For example, a BGP peer's local and remote addresses might be sensitive for ISPs who want to keep interface addresses on routers confidential in order to prevent router addresses used for a denial of service attack or spoofing.
Therefore, it is important in most environments to control read access to these objects and possibly to even encrypt the values of these object when sending them over the network via SNMP.
SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPsec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB module.
It is RECOMMENDED that implementers consider the security features as provided by the SNMPv3 framework (see [RFC3410], section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy).
Further, deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to enable cryptographic security. It is then a customer/operator responsibility to ensure that the SNMP entity giving access to an instance of this MIB module is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them.
6. Acknowledgements
-
We would like to acknowledge the assistance of all the members of the Inter-Domain Routing Working Group, and particularly the following individuals:
Yakov Rekhter, Juniper Networks
Rob Coltun, Redback
Guy Almes, Internet2
Jeff Honig, BSDi
Marshall T. Rose, Dover Beach Consulting, Inc.
Dennis Ferguson, Juniper Networks
Matt Mathis, PSC
John Krawczyk, Bay Networks
Curtis Villamizar, Avici
Dave LeRoy, Pencom Systems
Paul Traina, Juniper Networks
Andrew Partan, MFN
Robert Snyder, Cisco Systems
Dimitry Haskin, Nortel
Peder Chr Norgaard, Telebit Communications A/S
Joel Halpern, CTO Longitude Systems, Inc.
Nick Thille, RedBack Networks
Bert Wijnen, Lucent
Shane Wright, NextHop Technologies
Mike McFadden, Riverstone Networks, Inc.
Jon Saperia, JDS Consulting, Inc.
Wayne Tackabury, Gold Wire Technology, Inc.
Bill Fenner, AT&T Research
RJ Atkinson, Extreme Networks
Dan Romascanu, Avaya
Mathew Richardson, NextHop TechnologiesThe origin of this document is from RFC 1269 "Definitions of Managed Objects for the Border Gateway Protocol (Version 3)" written by Steve Willis and John Burruss, which was updated by John Chu to support BGP-4 in RFC 1657. The editors wish to acknowledge the fine work of these original authors.
7. Normative References
-
[BGP4] Rekhter, Y., Li, T., and S. Hares, Eds., "A Border Gateway Protocol 4 (BGP-4)", RFC 4271, January 2006. [BGP4APP] Rekhter, Y. and P. Gross, "Application of the Border Gateway Protocol in the Internet", RFC 1772, March 1995. [RFC2578] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2579] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999. [RFC2580] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999. [RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction and Applicability Statements for Internet- Standard Management Framework", RFC 3410, December 2002.
Editors' Addresses
-
Jeffrey Haas
NextHop Technologies
825 Victor's Way, Suite 100
Ann Arbor, MI 48103Phone: +1 734 222-1600 Fax: +1 734 222-1602 EMail: jhaas@nexthop.com
Susan Hares
NextHop Technologies
825 Victor's Way, Suite 100
Ann Arbor, MI 48103Phone: +1 734 222-1600 Fax: +1 734 222-1602 EMail: skh@nexthop.com
Full Copyright Statement
-
Copyright © The Internet Society (2006).
This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights.
This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Intellectual Property
-
The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79.
Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr.
The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org.
Acknowledgement
-
Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA).