Logging Neighbor Changes; Adjusting Bgp Timers - Cisco ASR 9000 Series Configuration Manual

Logging Neighbor Changes

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
Logging Neighbor Changes
Logging neighbor changes is enabled by default. Use the log neighbor changes disable command to turn off
logging. The no log neighbor changes disable command can also be used to turn logging back on if it has
been disabled.

Adjusting BGP Timers

Perform this task to set the timers for BGP neighbors.
BGP uses certain timers to control periodic activities, such as the sending of keepalive messages and the
interval after which a neighbor is assumed to be down if no messages are received from the neighbor during
the interval. The values set using the timers bgp command in router configuration mode can be overridden
on particular neighbors using the timers command in the neighbor configuration mode.
SUMMARY STEPS
1. configure
2. router bgp as-number
3. timers bgp keepalive hold-time
4. neighbor ip-address
5. timers keepalive hold-time
6. commit
DETAILED STEPS
Command or Action
Step 1
configure
Step 2 router bgp as-number
Example:
RP/0/RSP0/CPU0:router(config)# router bgp 123
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
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Purpose
Specifies the autonomous system number and enters the
BGP configuration mode, allowing you to configure the
BGP routing process.
Implementing BGP
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