Users Guide

Version Description
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Added the ipv4 multicast and ipv6 unicast parameters.
9.4.(0.0) Added support for VRF.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.8.1.0 Introduced on the S-Series.
7.7.1.0 Introduced on the C-Series.
Usage Information
In BGP, route attributes are maintained at different locations. When attributes that
correspond to multiple routes change, then attribute counts that the show ip bgp
summary command displays are calculated as summations of attributes corresponding
to all the associated routes. For example, if cluster_id is an attribute associated with
thousand routes that contain exactly the same set of attributes, then the cluster_id
count is 1. If these thousand routes are set with different attribute values with the same
cluster_id, then the cluster_id count is 1000, since the same value is stored for
thousand different attribute records.
The attribute next-hop is a part of the BGP attribute data structure.
If two peers send the same route that contains similar path attributes, then two entries
are maintained in the back-end, as both these entries have different next-hops. If this
same route is sent to a different peer, an entry for each peer is created, as the next-hop
is different. As a result, the BGP attributes count in the summary output will differ
accordingly.
The following describes the show ip bgp summary command shown in the following
example.
Field Description
BGP router
identifier
Displays the local router ID and the AS number.
BGP table version Displays the BGP table version and the main routing table
version.
network entries Displays the number of network entries, route paths, and the
amount of memory used to process those entries.
paths Displays the number of paths and the amount of memory used.
Border Gateway Protocol 501