📄 draft-ietf-idr-bgp4-mibv2-00.txt
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"Information about a path to a network." INDEX { bgp4PathAttrAddrPrefixType, bgp4PathAttrAddrPrefixSafi, bgp4PathAttrAddrPrefix, bgp4PathAttrAddrPrefixLen, bgp4PathAttrPeerType, bgp4PathAttrPeer } ::= { bgp4PathAttrTable 1 } Bgp4PathAttrEntry ::= SEQUENCE { bgp4PathAttrPeerType InetAddressType, bgp4PathAttrPeer InetAddress, bgp4PathAttrAddrPrefixType InetAddressType, bgp4PathAttrAddrPrefixSafi BgpSafi, Various Authors Expires July 13, 2002 [Page 27] Internet Draft BGP-MIB v2 July 13, 2001 bgp4PathAttrAddrPrefixType InetAddressType, bgp4PathAttrAddrPrefix InetAddress, bgp4PathAttrAddrPrefixLen Integer32, bgp4PathAttrOrigin INTEGER, bgp4PathAttrASPathSegment OCTET STRING, bgp4PathAttrNextHop InetAddress, bgp4PathAttrMultiExitDiscPresent TruthValue, bgp4PathAttrMultiExitDisc Unsigned32, bgp4PathAttrLocalPrefPresent TruthValue, bgp4PathAttrLocalPref Unsigned32, bgp4PathAttrAtomicAggregate INTEGER, bgp4PathAttrAggregatorAS Integer32, bgp4PathAttrAggregatorAddr BgpIdentifer, bgp4PathAttrCalcLocalPrefPresent TruthValue, bgp4PathAttrCalcLocalPref Unsigned32, bgp4PathAttrOriginatorId OCTET STRING, bgp4PathAttrClusterList OCTET STRING, bgp4PathAttrCommunity OCTET STRING, bgp4PathAttrExtCommunity OCTET STRING, bgp4PathAttrBest TruthValue, bgp4PathAttrUnknown OCTET STRING } bgp4PathAttrPeerType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-only STATUS current DESCRIPTION "The AFI of the address of the peer from which the path information was learned." ::= { bgp4PathAttrEntry 1 } Various Authors Expires July 13, 2002 [Page 28] Internet Draft BGP-MIB v2 July 13, 2001 bgp4PathAttrPeer OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The address of the peer where the path information was learned." ::= { bgp4PathAttrEntry 2 } bgp4PathAttrIpAddrPrefixType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-only STATUS current DESCRIPTION "The address family of the prefix for this NLRI." ::= { bgp4PathAttrEntry 3 } bgp4PathAttrIpAddrPrefixSafi OBJECT-TYPE SYNTAX BgpSafi MAX-ACCESS read-only STATUS current DESCRIPTION "The subsequent address family of the prefix for this NLRI" REFERENCE "RFC 2858 - Multiprotocol Extensions for BGP-4" ::= { bgp4PathAttrEntry 4 } bgp4PathAttrIpAddrPrefix OBJECT-TYPE SYNTAX InetAddress 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."-- jmh this doesn't encode very small on the wire? ::= { bgp4PathAttrEntry 5 } bgp4PathAttrIpAddrPrefixLen OBJECT-TYPE SYNTAX Integer32 MAX-ACCESS read-only STATUS current DESCRIPTION "Length in bits of the IP address prefix in the Network Layer Reachability Information field." ::= { bgp4PathAttrEntry 6 } Various Authors Expires July 13, 2002 [Page 29] Internet Draft BGP-MIB v2 July 13, 2001 bgp4PathAttrOrigin OBJECT-TYPE SYNTAX INTEGER { igp(1),-- networks are interior egp(2),-- networks learned -- via EGP incomplete(3) -- undetermined } MAX-ACCESS read-only STATUS current DESCRIPTION "The ultimate origin of the path information." ::= { bgp4PathAttrEntry 7 } bgp4PathAttrASPathSegment OBJECT-TYPE SYNTAX OCTET STRING (SIZE (2..4096))-- jmh could be shorter - find a reasonable ceiling 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 which has two possible values: 1 AS_SET: unordered set of ASs a route in the UPDATE message has traversed 2 AS_SEQUENCE: ordered set of ASs a route in the UPDATE message has traversed. 3 CONFED_SEQUENCE: ordered set of ASs a route has traversed within a confederation. These MUST occur before AS_SETs and AS_SEQUENCES 4 CONFED_SET: unordered set of ASs a route has traversed within a confederation. These MUST occur before AS_SETs and AS_SEQUENCES Other types may be defined in the future and will be displayed in this variable. The length is a 1-octet field containing the number of ASs in the value field.-- jmh - this is a spec error Various Authors Expires July 13, 2002 [Page 29] Internet Draft BGP-MIB v2 July 13, 2001 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: If the bgpAsSize is twoOctet: first-byte-of-pair = ASNumber / 256; second-byte-of-pair = ASNumber & 255; If the bgpAsSize is fourOctet: first-byte-of-quad = (ASNumber / 16777216); second-byte-of-quad = (ASNumber / 65536) & 255; third-byte-of-quad = (ASNumber / 256) & 255; fourth-byte-of-quad = ASNumber & 255;" ::= { bgp4PathAttrEntry 8 }-- jmh we need the new_as_path here now bgp4PathAttrNextHop OBJECT-TYPE SYNTAX InetAddress 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 nexthop address received in the UPDATE packet. The address family of this object will be the same as that of the prefix in this row." ::= { bgp4PathAttrEntry 9 } bgp4PathAttrMultiExitDiscPresent OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-only STATUS current DESCRIPTION "Whether or not the MED value is present. If it is not present, the bgp4PathAttrMultiExitDisc object has no useful value and should be set to 0." ::= { bgp4PathAttrEntry 10 } bgp4PathAttrMultiExitDisc OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This metric is used to discriminate between multiple exit points to an adjacent autonomous system." ::= { bgp4PathAttrEntry 11 } Various Authors Expires July 13, 2002 [Page 30] Internet Draft BGP-MIB v2 July 13, 2001 bgp4PathAttrLocalPrefPresent OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-only STATUS current DESCRIPTION "Whether or not the LOCAL_PREF value is present. If it is not present, the bgp4PathAttrLocalPref object has no useful value and should be set to 0." ::= { bgp4PathAttrEntry 12 } bgp4PathAttrLocalPref OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "The originating BGP4 speaker's degree of preference for an advertised route." ::= { bgp4PathAttrEntry 13 } bgp4PathAttrAtomicAggregate OBJECT-TYPE SYNTAX INTEGER { lessSpecificRouteNotSelected(1), lessSpecificRouteSelected(2) } MAX-ACCESS read-only STATUS current DESCRIPTION "Whether or not a system has selected a less specific route without selecting a more specific route." ::= { bgp4PathAttrEntry 14 } bgp4PathAttrAggregatorAS OBJECT-TYPE SYNTAX BgpAutonomousSystemNumber 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." ::= { bgp4PathAttrEntry 15 } bgp4PathAttrAggregatorAddr OBJECT-TYPE SYNTAX BgpIdentifier 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. Note propagation of AS of zero is illegal in the Internet." ::= { bgp4PathAttrEntry 16 }Various Authors Expires July 13, 2002 [Page 31] Internet Draft BGP-MIB v2 July 13, 2001 bgp4PathAttrCalcLocalPrefPresent OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-only STATUS current DESCRIPTION "Whether or not the bgp4PathAttrCalcLocalPref is present." ::= { bgp4PathAttrEntry 17 } bgp4PathAttrCalcLocalPref OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "The degree of preference calculated by the receiving BGP4 speaker for an advertised route." ::= { bgp4PathAttrEntry 18 } bgp4PathAttrOriginatorId OBJECT-TYPE SYNTAX BgpIdentifier MAX-ACCESS read-only STATUS current DESCRIPTION "The Originator-ID identifying the router that initially advertised this destination to a Route Reflector. A value of 0.0.0.0 indicates the absence of this attribute." REFERENCE "This attribute is defined in [RFC2796]." ::= { bgp4PathAttrEntry 19 } bgp4PathAttrClusterList OBJECT-TYPE SYNTAX OCTET STRING (SIZE(0..4096)) MAX-ACCESS read-only STATUS current DESCRIPTION "A sequence of four octet long values representing the reflection path that the route has passed. Each four octet long value represents the ID of a cluster that the route has traversed. A length of zero (0) indicates the absence of this attribute." REFERENCE "This attribute is defined in [RFC2796]." ::= { bgp4PathAttrEntry 20 } Various Authors Expires July 13, 2002 [Page 32] Internet Draft BGP-MIB v2 July 13, 2001 bgp4PathAttrCommunity OBJECT-TYPE SYNTAX OCTET STRING (SIZE(0..4096)) MAX-ACCESS read-only STATUS current DESCRIPTION "A list of 4-octet long values, each representing a community. Size zero (0) indicates the absence of such attributes. Octets beyond the maximum size, if any, are not recorded by this object. There are certain 4-octet long values that carry additional semantics." REFERENCE "RFC 1997 - BGP Communities Attribute" ⌨️ 快捷键说明
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