Users Guide

Version Description
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 dierent 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 dierent attribute values with the same cluster_id, then the cluster_id count is
1000, since the same value is stored for thousand dierent 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 dierent next-hops. If this same route is sent to a dierent peer, an entry for each
peer is created, as the next-hop is dierent. As a result, the BGP attributes count in the summary output will dier
accordingly.
The following describes the show ip bgp summary command shown in the following example.
Field Description
BGP router
identier
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.
denied paths Displays the number of denied paths and the amount of memory used.
BGP path attribute
entries
Displays the number of BGP path attributes and the amount of memory used to process
them.
BGP AS-PATH
entries
Displays the number of BGP AS_PATH attributes processed and the amount of memory
used to process them.
BGP community
entries
Displays the number of BGP COMMUNITY attributes processed and the amount of
memory used to process them. The show ip bgp community command provides
more details on the COMMUNITY attributes.
Dampening enabled Displayed only when you enable dampening. Displays the number of paths designated as
history, dampened, or penalized.
Neighbor Displays the BGP neighbor address.
AS Displays the AS number of the neighbor.
MsgRcvd Displays the number of BGP messages that neighbor received.
MsgSent Displays the number of BGP messages that neighbor sent.
TblVer Displays the version of the BGP table that was sent to that neighbor.
InQ Displays the number of messages from that neighbor waiting to be processed.
Border Gateway Protocol 421