we've got a problem ... we configured hsrp with two routers like this:
standby 5 ip 10.10.10.1
standby 5 timers 1 3
standby 5 priority 150
standby 5 preempt
standby 5 authentication
Last time the interface at the switch came permanently in a short period up and down. And so everytime the hsrp process started with the result that the hsrp interface was not available respectively was available but with a long and unacceptable response time.
Now we want to increase the availability. So if we'll have such a flickering interface at the switch, the standby router assumes the routing responsibility and has to wait for a certain time until switching back to the router with higher priority.
My question is now, if I can configure the interface with the option <standby 5 preempt delay minimum 300>. Is it right, that this command causes the standby router to wait 300ms until the router with the higher priority takes over? If the interface is down during this period, is there a reset of the counter?
Or is there another possibility to handle the hsrp with these flickering interfaces?
You might want to consider the use of Interface Dampening when you experience such 'flickering' interfaces. Dampening an interface removes the interface from the network until the interface stops flapping and becomes stable. Configuring the IP Event Dampening feature improves convergence times and stability throughout the network by isolating failures so that disturbances are not propagated, which reduces the utilization of system processing resources by other devices in the network and improves overall network stability.
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