•
Enable Primary Chassis BFD Monitoring, on page 228
.
•
Set BFD to Ignore ICSR Dead Interval, on page 228
.
•
Configure ICSR Switchover Guard Timer, on page 228
.
•
Enable BFD Multihop Fall-over , on page 229
.
•
Enable Advertising BGP Routes from Standby ICSR Chassis, on page 230
.
Enable Primary Chassis BFD Monitoring
You must enable monitoring of the connection between the primary chassis and specified BFD neighbors. If
the connection drops, the standby chassis becomes active. For more information, see
Connection for ICSR, on page 227
.
Set BFD to Ignore ICSR Dead Interval
The SRP Configuration mode
bfd-mon-ignore-dead-interval
command causes the standby ICSR chassis to
ignore the dead interval and remain in the standby state until all the BFD chassis-to-chassis monitors fail.
Enable this feature in association with BFD chassis-to-chassis monitoring to support more aggressive ICSR
failure detection times.
configure
context context_name
service-redundancy-protocol variable
bfd-mon-ignore-dead-interval
end
Configure ICSR Switchover Guard Timer
The SRP Configuration mode
guard timer
command configures the redundancy-guard-period and
monitor-damping-period for SRP service monitoring.
Use these guard timers to ensure that local failures, such as card reboots and task restarts, do not result in
ICSR events which can be disruptive.
configure
context context_name
service-redundancy-protocol variable
guard-timer { aaa-switchover-timers { damping-period seconds | guard-period seconds } |
diameter-switchover-timers { damping-period seconds | guard-period seconds } | srp-redundancy-timers
{ aaa { damping-period seconds | guard-period seconds } | bgp { damping-period seconds |
guard-period seconds } | diam { damping-period seconds | guard-period seconds } }
end
Notes:
•
aaa-switchover-timers
–
sets timers that prevent back-to-back ICSR switchovers due to an AAA failure
(post ICSR switchover) while the network is still converging.
◦
damping-period
–
configures a delay time to trigger an ICSR switchover due to a monitoring
failure within the guard-period.
◦
guard-period
–
configures the local-failure-recovery network-convergence timer.
ASR 5500 System Administration Guide, StarOS Release 21.5
228
Routing
Chassis-to-Chassis BFD Monitoring for ICSR
