Dell C9000 series, Reference Manual

Page: 540 / 2286

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
1000 routes that contain the same set of attributes, then the cluster_id count is 1. If
these 1000 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 for1000 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 differs
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.
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.
Border Gateway Protocol 540