Cisco ASR 9000 Series Routing Configuration Guide

DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Specifies the autonomous system number and enters
the BGP configuration mode, allowing you to
configure the BGP routing process.
router bgp as-number
Example:
RP/0/RSP0/CPU0:router# router bgp 120
Step 2
Specifies a BGP confederation identifier.
bgp confederation identifier as-number
Example:
RP/0/RSP0/CPU0:router(config-bgp)# bgp confederation
identifier 5
Step 3
Specifies that the BGP autonomous systems belong
to a specified BGP confederation identifier. You
bgp confederation peers as-number
Example:
RP/0/RSP0/CPU0:router(config-bgp)# bgp confederation
Step 4
can associate multiple AS numbers to the same
confederation identifier, as shown in the example.
peers 1091
RP/0/RSP0/CPU0:router(config-bgp)# bgp confederation
peers 1092
RP/0/RSP0/CPU0:router(config-bgp)# bgp confederation
peers 1093
RP/0/RSP0/CPU0:router(config-bgp)# bgp confederation
peers 1094
RP/0/RSP0/CPU0:router(config-bgp)# bgp confederation
peers 1095
RP/0/RSP0/CPU0:router(config-bgp)# bgp confederation
peers 1096
commit
Step 5
Resetting an eBGP Session Immediately Upon Link Failure
By default, if a link goes down, all BGP sessions of any directly adjacent external peers are immediately reset.
Use the bgp fast-external-fallover disable command to disable automatic resetting. Turn the automatic reset
back on using the no bgp fast-external-fallover disable command.
eBGP sessions flap when the node reaches 3500 eBGP sessions with BGP timer values set as 10 and 30. To
support more than 3500 eBGP sessions, increase the packet rate by using the lpts pifib hardware police
location location-id command. Following is a sample configuration to increase the eBGP sessions:
RP/0/RSP0/CPU0:router#configure
RP/0/RSP0/CPU0:router(config)#lpts pifib hardware police location 0/2/CPU0
RP/0/RSP0/CPU0:router(config-pifib-policer-per-node)#flow bgp configured rate 4000
RP/0/RSP0/CPU0:router(config-pifib-policer-per-node)#flow bgp known rate 4000
RP/0/RSP0/CPU0:router(config-pifib-policer-per-node)#flow bgp default rate 4000
RP/0/RSP0/CPU0:router(config-pifib-policer-per-node)#commit
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
83
Implementing BGP
Resetting an eBGP Session Immediately Upon Link Failure

Cisco ASR 9000 Series Specifications

General

Brand	Cisco
Model	ASR 9000 Series
Category	Network Router
Language	English