Reference Guide

Configure BGP
OS10# configure terminal
OS10(config)# router bgp 100
OS10(config-router-bgp-100)# neighbor 5.1.1.1
OS10(config-router-neighbor)# remote-as 1
OS10(config-router-neighbor)# description n1_abcd
OS10(config-router-neighbor)# exit
OS10(config-router-bgp-100)# template t1
OS10(config-router-template)# description peer_template_1_abcd
View BGP summary with 2-byte AS number
OS10# show ip bgp summary
BGP router identifier 202.236.164.86 local AS number 64901
Neighbor AS MsgRcvd MsgSent Up/Down State/Pfx
120.10.1.1 64701 664 662 04:47:52 established 12000
View BGP summary with 4-byte AS number
OS10# show ip bgp summary
BGP router identifier 11.1.1.1, local AS number 4294967295
BGP local RIB : Routes to be Added 0, Replaced 0, Withdrawn 0
1 neighbor(s) using 8192 bytes of memory
Neighbor AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/Pfx
5.1.1.2 4294967295 0 0 0 0 0 00:00:00 Active
For the router ID, the system selects the first configured IP address or a random number. To view the status of BGP
neighbors, use the show ip bgp neighbors command. For BGP neighbor configuration information, use the show
running-config bgp command.
The example shows two neighbors — one is an external BGP neighbor, and the other is an internal BGP neighbor. The first line
of the output for each neighbor displays the AS number and states if the link is external or internal.
The third line of the show ip bgp neighbors output contains the BGP state. If anything other than established displays,
the neighbor is not exchanging information and routes - see IPv6 commands for more information.
View BGP neighbors
OS10# show ip bgp neighbors
BGP neighbor is 5.1.1.1, remote AS 1, internal link
BGP version 4, remote router ID 6.1.1.1
BGP state established, in this state for 00:03:11
Last read 01:08:40 seconds, hold time is 180, keepalive interval is 60 seconds
Received 11 messages
3 opens, 1 notifications, 3 updates
4 keepalives, 0 route refresh requests
Sent 14 messages
3 opens, 1 notifications, 0 updates
10 keepalives, 0 route refresh requests
Minimum time between advertisement runs is 0 seconds
Description: n1_abcd
Capabilities received from neighbor for IPv4 Unicast:
MULTIPROTO_EXT(1)ROUTE_REFRESH(2)CISCO_ROUTE_REFRESH(128)
Capabilities advertised to neighbor for IPv4 Unicast:
MULTIPROTO_EXT(1)ROUTE_REFRESH(2)CISCO_ROUTE_REFRESH(128)
Prefixes accepted 3, Prefixes advertised 0
Connections established 3; dropped 2
Closed by neighbor sent 00:03:26 ago
Local host: 5.1.1.2, Local port: 43115
Foreign host: 5.1.1.1, Foreign port: 179
Layer 3
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