Peer Group Parameters

In this example, the show ip bgp peer-group command displays information about the peer group named "wg_peers." One of the peer group members (192.168.20.1) has been selected as the peer group leader, meaning that all outgoing BGP updates are processed as if they were being sent to this neighbor. Thereafter, the update is replicated on all the BGP sessions to the other members in the wg_peers peer group.

A peer group should have only IBGP members or EBGP members. In the example shown, the members are EBGP neighbors.

All parameters that are configured for the peer group are listed in the show ip bgp peer-group command output. In the example, the peer group wg_peers has been configured in the following manner:

neighbor wg_peers description Workgroup neighbors reachable over provider LAN

neighbor wg_peers distribute-list 6 in neighbor wg_peers distribute-list 6 out neighbor wg_peers filter-list 25 weight 200 neighbor wg_peers filter-list 27 in

Optimizing BGP Scalability

7-61

routertt show ip bgp peer-group wg peers

summary

BGP table version

is 56, main routing table version 56

51 network entries

(51/153 paths)

using

10568 bytes of memory

18 BGP path attribute entries using 22 96 bytes of

memory

0 BGP route-map

cache entries using 0 bytes of memory

0 BGP filter-list

cache entries using 0 bytes of

memory

Neighbor

V

AS MsgRcvd MsgSent

TblVer

InQ OutQ Up/Down

State

192.168.20.1

4

1 0

0

0

0 0 never

Active

192.168.20.2

4

2 0

0

0

0 0 never

Active

192.168.20.3

4

3 0

0

0

0 0 never

Active

192.168.20.5

4

5 53

81

56

0 0 00:00

52

192.168.20.20

4

20 62

59

56

0 0 00:00

44

192.168.20.22

4

22 54

54

56

0 0 00:00

44

• The printout is identical to a show ip bgp summary printout but displays only neighbors that are members of the specified peer group.

The show ip bgp peer-group peer-group-name summary command is used in this example to display only the summary status information about the neighbors who are members of the peer group wg_peers.

Note The show ip bgp summary command is described in the module "BGP Overview."

7-62 Configuring BGP on Cisco Routers (BGP) v3.2 © 2005, Cisco Systems, Inc.

The show ip bgp neighbor command displays additional information about BGP neighbors that are members of a peer group.

In the example here, the membership in the peer group wg_peers is indicated, in addition to other information as displayed by the command.

© 2005, Cisco Systems, Inc. Optimizing BGP Scalability 7-63

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