Configuring Micro-loop Avoidance

The following command enables the micro-loop avoidance feature within each IGP instance:

config>router>isis>segm-rtng# micro-loop-avoidance
    — micro-loop-avoidance [fib-delay fib-delay]
    — no micro-loop-avoidance

fib-delay : [1..300] - default: 15, in 100s of milliseconds

The fib-delay timer should be configured to a value that corresponds to the worst-case IGP convergence in a given network domain. The default value of 1.5 seconds (1500 milliseconds) corresponds to a network with a nominal convergence time.

When this feature is disabled using the no micro-loop-avoidance command, any active FIB delay timer is forced to expire immediately and the new next hops are programmed for all impacted node SIDs. The feature is disabled for the next SPF runs.

When this feature is enabled, the following scenarios apply:

Parent topic: Micro-Loop Avoidance Using Loop-Free SR Tunnels for IS-IS