ExtremeBgp4V2Nlri Table

MIB objects

Objects and OID Access Description

extremeBgp4V2NlriTable

1.3.6.1.4.1.1916.1.51.1.9

None

This entity contains information of the bgp4PathAttr Table.

extremeBgp4V2NlriEntry

1.3.6.1.4.1.1916.1.51.1.9.1

None

An entry containing information about the bgp4PathAttr.

extremeBgp4V2NlriIndex

1.3.6.1.4.1.1916.1.51.1.9.1.1

None

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 implementations to send more than a single route instance.

  2. Allow for extensions which extend the NLRI field to send the same prefix while utilizing other extension specific information.

An example of this is RFC 3107 - Carrying MPLS labels in BGP.

extremeBgp4V2NlriAfi

1.3.6.1.4.1.1916.1.51.1.9.1.2

None

The address family of the prefix for this NLRI. Note that the AFI is not necessarily equivalent to the InetAddressType.

extremeBgp4V2NlriSafi

1.3.6.1.4.1.1916.1.51.1.9.1.3

None

The subsequent address family of the prefix for this NLRI.

extremeBgp4V2NlriPrefixType

1.3.6.1.4.1.1916.1.51.1.9.1.4

None

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 extremeBgp4V2NlriAfi field. Where an appropriate InetAddressType is not available, the value of the object must be unknown (0).

extremeBgp4V2NlriPrefix

1.3.6.1.4.1.1916.1.51.1.9.1.5

None

An IP address prefix in the Network Layer Reachability Information field. This object is an IP address containing the prefix with length specified by extremeBgp4V2NlriPrefixLen.

Any bits beyond the length specified by extremeBgp4V2NlriPrefixLen are zeroed.

extremeBgp4V2NlriPrefixLen

1.3.6.1.4.1.1916.1.51.1.9.1.6

None

Length in bits of the address prefix in the Network Layer Reachability Information field.

extremeBgp4V2NlriBest

1.3.6.1.4.1.1916.1.51.1.9.1.7

Read-Only

An indication of whether or not this route was chosen as the best BGP4 route for this destination.

extremeBgp4V2NlriCalcLocalPref

1.3.6.1.4.1.1916.1.51.1.9.1.8

Read-Only

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 will be zero (0).

extremeBgp4V2NlriOrigin

1.3.6.1.4.1.1916.1.51.1.9.1.9

Read-Only

The ultimate origin of the path information.

extremeBgp4V2Nlrinext-hopAddrType

1.3.6.1.4.1.1916.1.51.1.9.1.10

Read-Only

The address family of the address for the border router that should be used to access the destination network.

extremeBgp4V2Nlrinext-hopAddr

1.3.6.1.4.1.1916.1.51.1.9.1.11

Read-Only

The address of the border router that should be used to access the destination network. This address is the next-hop address received in the UPDATE packet associated with this prefix.

Note:

For RFC2545 style double next-hops, this object will always contain the global scope next-hop. bgpPathAttrLinkLocalnext-hop will contain the link-local scope next-hop, if it is present.

In the case a mechanism is developed to use only a link local next-hop, extremeBgp4V2Nlrinext-hopAddr will contain the link local next-hop.

extremeBgp4V2NlriLinkLocalnext-hopAddrType

1.3.6.1.4.1.1916.1.51.1.9.1.12

Read-Only

The address type for IPv6 link local addresses. This is present only when receiving RFC 2545 style double next-hops.

This object is optionally present in BGP implementations that do not support IPv6.

When no IPv6 link local next-hop is present, the value of this object should be unknown(0).

extremeBgp4V2NlriLinkLocalnext-hopAddr

1.3.6.1.4.1.1916.1.51.1.9.1.13

Read-Only

This value contains an IPv6 link local address and is present only when receiving RFC 2545 style double next-hops. This object is optionally present in BGP implementations that do not support IPv6 When no IPv6 link local next-hop is present, the length of this object should be zero.

extremeBgp4V2NlriLocalPrefPresent

1.3.6.1.4.1.1916.1.51.1.9.1.14

Read-Only

This value is true when the LOCAL_PREF value was sent in the UPDATE message.

extremeBgp4V2NlriLocalPref

1.3.6.1.4.1.1916.1.51.1.9.1.15

Read-Only

The originating BGP4 speaker‘s degree of preference for an advertised route.

extremeBgp4V2NlriMedPresent

1.3.6.1.4.1.1916.1.51.1.9.1.16

Read-Only

This value is true when the MED value was sent in the UPDATE message.

extremeBgp4V2NlriMed

1.3.6.1.4.1.1916.1.51.1.9.1.17

Read-Only

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 will contain the calculated value.

extremeBgp4V2NlriAtomicAggregate

1.3.6.1.4.1.1916.1.51.1.9.1.18

Read-Only

This value is true when the ATOMIC_AGGREGATE Path Attribute is present and indicates that the NLRI MUST NOT be made more specific.

extremeBgp4V2NlriAggregatorPresent

1.3.6.1.4.1.1916.1.51.1.9.1.19

Read-Only

This value is true when the AGGREGATOR path attribute was sent in the UPDATE message.

extremeBgp4V2NlriAggregatorAS

1.3.6.1.4.1.1916.1.51.1.9.1.20

Read-Only

The AS number of the last BGP4 speaker that performed route aggregation. When extremeBgp4V2NlriAggregatorPresent is false, the value of this object should be zero (0).

extremeBgp4V2NlriAggregatorAddr

1.3.6.1.4.1.1916.1.51.1.9.1.21

Read-Only

The IP address of the last BGP4 speaker that performed route aggregation. When extremeBgp4V2NlriAggregatorPresent is false, the value of this object should be a default value.

extremeBgp4V2NlriAsPathCalcLength

1.3.6.1.4.1.1916.1.51.1.9.1.22

Read-Only

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.

extremeBgp4V2NlriAsPathString

1.3.6.1.4.1.1916.1.51.1.9.1.23

Read-Only

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, and should be designed for operator readability.

Note:

SnmpAdminString is only capable of representing a maximum of 255 characters. This may lead to the string being truncated in the presence of a large AS Path. It is RECOMMENDED that when this object's contents will be truncated that the final 3 octets be reserved for the ellipses string, '...'. extremeBgp4V2NlriAsPath may give access to the full AS Path.

extremeBgp4V2NlriAsPath

1.3.6.1.4.1.1916.1.51.1.9.1.24

Read-Only

In order to provide a canonicalized form of the BGP-4 AS_PATH along with the human-readable extremeBgp4V2NlriAsPathString, 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:

  • AS_SET (RFC 4721, Section 4.3)

  • AS_SEQUENCE (RFC 4721,Section 4.3)

  • AS_CONFED_SEQUENCE(RFC 3065,Section 5)

  • 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:

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 conjunction 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.

extremeBgp4V2NlriPathAttrUnknown

1.3.6.1.4.1.1916.1.51.1.9.1.25

Read-Only

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, Section 4.3, 'Path Attributes'.

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 Path Attribute.