Dell C9000 Series Reference Manual page 540

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
BGP router
identifier
BGP table version
network entries
paths
denied paths
BGP path attribute
entries
BGP AS-PATH
entries
BGP community
entries
Dampening
enabled
Neighbor
AS
MsgRcvd
Description
Displays the local router ID and the AS number.
Displays the BGP table version and the main routing table
version.
Displays the number of network entries, route paths, and the
amount of memory used to process those entries.
Displays the number of paths and the amount of memory used.
Displays the number of denied paths and the amount of
memory used.
Displays the number of BGP path attributes and the amount of
memory used to process them.
Displays the number of BGP AS_PATH attributes processed and
the amount of memory used to process them.
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.
Displayed only when you enable dampening. Displays the
number of paths designated as history, dampened, or penalized.
Displays the BGP neighbor address.
Displays the AS number of the neighbor.
Displays the number of BGP messages that neighbor received.
Border Gateway Protocol 540