03-18-2016 04:54 PM - edited 03-08-2019 05:02 AM
Today I was told changing interface bandwidth will cause interface flapping. I am unable to repro. Is there any platform on which changing interface bandwidth causes traffic interruption with EIGRP? AFAIK I don't think it has impact on availability with OSPF.
For EIGRP if metric is increased and no FD available, it will result in queries for affected prefixes. I am not seeing how that would impact availability tho.
03-18-2016 05:46 PM
Hi -
I can't recall a situation where modifying the bandwidth statement on the interface caused an interface flap. The bandwidth statement only impacts processes in the router that use it as a basis for calculations (EIGRP, OSPF, QOS, FabricPath, etc...). Even if a recalculation results in modification of the traffic flows, you still don't get an interface flap. The traffic just migrates to the desired path (or hopefully the desired path). Worst case scenario with your routing protocol is that you send traffic down a low bandwidth link by accident.
HTH and Good Luck!
PSC
08-07-2018 04:41 PM
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