bgp4V2NlriAsPath

BGP4V2-MIB · .1.3.6.1.3.5.1.1.9.1.24

Object

column OctetString

In order to provide a canonicalized form of the BGP-4
AS_PATH along with the human-readable
bgp4V2NlriAsPathString, which may be truncated, this object
contains the contents of the BGP-4 AS_PATH Path Attribute.
This object may be parsed using the rules defined for
Four-octet ASes as defined in RFC 4893.  RFC 4271, Section
4.3, 'Path Attributes: b) AS_PATH' as amended by RFC 5065,
Section 3 defines the general format of the AS_PATH path
attribute and its code points.
              
In brief, the AS_PATH is composed of a sequence of AS
Segments.  Each AS Segment is represented by a triple:
<path segment type, path segment length,
path segment value>.
              
The path segment type and path segment length fields are
one octet in length each.
              
The path segment type field may be one of:
  1 - AS_SET (RFC 4721, Section 4.3)
  2 - AS_SEQUENCE (RFC 4721, Section 4.3)
  3 - AS_CONFED_SEQUENCE (RFC 3065, Section 5)
  4 - AS_CONFED_SET (RFC 3065, Section 5)
              
The path segment length field contains the number of ASes
(not the number of octets) in the path segment value field.
              
              
              
The path segment value field contains one or more AS
numbers, each encoded as a 4-octet length field in network
byte order.
              
Note that since an SNMP agent may truncate this object to
less than its maximum theoretical length of 4072 octets
users of this object should be prepared to deal with a
truncated and thus malformed AS_PATH.  It is RECOMMENDED
that when such truncation would occur on the boundary of an
encoded AS that the partial AS be discarded from this
object and the object's size be adjusted accordingly.
Further, it is also RECOMMENDED that when such truncation,
either alone or in conjuction with the truncation of a
partially encoded AS described previously, would yield an
empty path segment value field that the path segment type
and path segment length components of the truncated AS_PATH
also be discarded and the object's size be adjusted
accordingly.

Context

MIB: BGP4V2-MIB
OID: .1.3.6.1.3.5.1.1.9.1.24
Type: column
Access: readonly
Status: current
Parent: bgp4V2NlriEntry
Table: bgp4V2NlriTable
Siblings: 24

Syntax

OctetString

Values & Constraints

Object Constraints

range: 2-4072

Related Objects

Sibling Objects

Object	Type	Syntax	OID
bgp4V2NlriIndex This index allows for multiple instances of a base prefix for a certain AFI-SAFI from a given peer. This is currently useful for two things: 1. Allowing for a peer in future imple…	column	Unsigned32	`.1.3.6.1.3.5.1.1.9.1.1`
bgp4V2NlriNextHopAddrType The address family of the address for the border router that should be used to access the destination network.	column	INET-ADDRESS-MIBInetAddressType	`.1.3.6.1.3.5.1.1.9.1.10`
bgp4V2NlriNextHopAddr The address of the border router that should be used to access the destination network. This address is the nexthop address received in the UPDATE packet associated with this pref…	column	OctetString	`.1.3.6.1.3.5.1.1.9.1.11`
bgp4V2NlriLinkLocalNextHopAddrType The address type for IPv6 link local addresses. This is present only when receiving RFC 2545 style double nexthops. This object is optionally present in BGP …	column	INET-ADDRESS-MIBInetAddressType	`.1.3.6.1.3.5.1.1.9.1.12`
bgp4V2NlriLinkLocalNextHopAddr This value contains an IPv6 link local address and is present only when receiving RFC 2545 style double nexthops. This object is optionally present in BGP implement…	column	INET-ADDRESS-MIBInetAddress	`.1.3.6.1.3.5.1.1.9.1.13`
bgp4V2NlriLocalPrefPresent This value is true when the LOCAL_PREF value was sent in the UPDATE message.	column	SNMPv2-TCTruthValue	`.1.3.6.1.3.5.1.1.9.1.14`
bgp4V2NlriLocalPref The originating BGP4 speakers degree of preference for an advertised route.	column	SNMPv2-SMIUnsigned32	`.1.3.6.1.3.5.1.1.9.1.15`
bgp4V2NlriMedPresent This value is true when the MED value was sent in the UPDATE message.	column	SNMPv2-TCTruthValue	`.1.3.6.1.3.5.1.1.9.1.16`
bgp4V2NlriMed This metric is used to discriminate between multiple exit points to an adjacent autonomous system. When the MED value is absent but has a calculated default value, this object wi…	column	SNMPv2-SMIUnsigned32	`.1.3.6.1.3.5.1.1.9.1.17`
bgp4V2NlriAtomicAggregate This value is true when the ATOMIC_AGGREGATE Path Attribute is present and indicates that the NLRI MUST NOT be made more specific.	column	SNMPv2-TCTruthValue	`.1.3.6.1.3.5.1.1.9.1.18`
bgp4V2NlriAggregatorPresent This value is true when the AGGREGATOR path attribute was sent in the UPDATE message.	column	SNMPv2-TCTruthValue	`.1.3.6.1.3.5.1.1.9.1.19`
bgp4V2NlriAfi The address family of the prefix for this NLRI. Note that the AFI is not necessarily equivalent to the an InetAddressType.	column	BGP4V2-TC-MIBBgp4V2AddressFamilyIdentifierTC	`.1.3.6.1.3.5.1.1.9.1.2`
bgp4V2NlriAggregatorAS The AS number of the last BGP4 speaker that performed route aggregation. When bgp4V2NlriAggregatorPresent is false, the value of this object should be zero (0).	column	INET-ADDRESS-MIBInetAutonomousSystemNumber	`.1.3.6.1.3.5.1.1.9.1.20`
bgp4V2NlriAggregatorAddr The IP address of the last BGP4 speaker that performed route aggregation. When bgp4V2NlriAggregatorPresent is false, the value of this object should be 0.0.0.0	column	BGP4V2-TC-MIBBgp4V2IdentifierTC	`.1.3.6.1.3.5.1.1.9.1.21`
bgp4V2NlriAsPathCalcLength This value represents the calculated length of the AS Path according to the rules of the BGP specification. This value is used in route selection.	column	SNMPv2-SMIUnsigned32	`.1.3.6.1.3.5.1.1.9.1.22`
bgp4V2NlriAsPathString This is a string depicting the autonomous system path to this network which was received from the peer which advertised it. The format of the string is implementation-dependent, a…	column	SNMP-FRAMEWORK-MIBSnmpAdminString	`.1.3.6.1.3.5.1.1.9.1.23`
bgp4V2NlriPathAttrUnknown Path Attributes not understood by this implementation SHOULD be be presented in this object. Those Path Attributes use the type, length, value encoding documented in RFC 4271, Se…	column	OctetString	`.1.3.6.1.3.5.1.1.9.1.25`
bgp4V2NlriSafi The subsequent address family of the prefix for this NLRI	column	BGP4V2-TC-MIBBgp4V2SubsequentAddressFamilyIdentifierTC	`.1.3.6.1.3.5.1.1.9.1.3`
bgp4V2NlriPrefixType The type of the IP address prefix in the Network Layer Reachability Information field. The value of this object is derived from the appropriate value from the bgp4V2NlriAfi field.…	column	INET-ADDRESS-MIBInetAddressType	`.1.3.6.1.3.5.1.1.9.1.4`
bgp4V2NlriPrefix An IP address prefix in the Network Layer Reachability Information field. This object is an IP address containing the prefix with length specified by bgp4V2NlriPrefixLen. Any bits…	column	INET-ADDRESS-MIBInetAddress	`.1.3.6.1.3.5.1.1.9.1.5`
bgp4V2NlriPrefixLen Length in bits of the address prefix in the Network Layer Reachability Information field.	column	INET-ADDRESS-MIBInetAddressPrefixLength	`.1.3.6.1.3.5.1.1.9.1.6`
bgp4V2NlriBest An indication of whether or not this route was chosen as the best BGP4 route for this destination.	column	SNMPv2-TCTruthValue	`.1.3.6.1.3.5.1.1.9.1.7`
bgp4V2NlriCalcLocalPref The degree of preference calculated by the receiving BGP4 speaker for an advertised route. In the case where this prefix is ineligible, the value of this object wil…	column	SNMPv2-SMIUnsigned32	`.1.3.6.1.3.5.1.1.9.1.8`
bgp4V2NlriOrigin The ultimate origin of the path information.	column	Enumeration	`.1.3.6.1.3.5.1.1.9.1.9`