Resetting An Ebgp Session Immediately Upon Link Failure - Cisco ASR 9000 Series Routing Configuration Manual

Implementing BGP
DETAILED STEPS
Command or Action
Step 1
configure
Step 2 router bgp as-number
Example:
RP/0/RSP0/CPU0:router# router bgp 120
Step 3 bgp confederation identifier as-number
Example:
RP/0/RSP0/CPU0:router(config-bgp)# bgp confederation
identifier 5
Step 4
bgp confederation peers as-number
Example:
RP/0/RSP0/CPU0:router(config-bgp)# bgp confederation
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
Step 5
commit

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
Resetting an eBGP Session Immediately Upon Link Failure
Purpose
Specifies the autonomous system number and enters
the BGP configuration mode, allowing you to
configure the BGP routing process.
Specifies a BGP confederation identifier.
Specifies that the BGP autonomous systems belong
to a specified BGP confederation identifier. You
can associate multiple AS numbers to the same
confederation identifier, as shown in the example.
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