How to monitor route flap

[vsraghav123]

Hello Networkers,

I would like to know whether there is any mechanism to monitor route , the reason is when we have a link flap on the primary circuit normally the traffic flows through backup circuit but when there is continous flap on primary circuit the traffic gets moving between primary & secondary which is causing impact for the users.

Would like to know whether we can monitor the stability of the link by looking at the route uptime ( kind of holdtime timer , say 15 minutes ? ) before it moves the link back to the best metric that is the primary circuit , my current protocol is EIGRP.

[sean_evershed]

Did you want an automated way of doing this? If so you could explore the use of an EEM script assuming that you had a suitable version of IOS.

See below this EEM script will email you when a L3 Path Failure occurs forcing an EIGRP Neighbor Change

http://forums.cisco.com/eforum/servlet/EEM?page=eem&fn=script&scriptId=1002

Please remeber to rate all posts that are helpful

[vsraghav123]

Please correct me if I'm worng , EEM is a proactive event managemnet tool which does only notification ?? whereas my requirement is that the protocol should make a decision before selecting a preffered route.

Is there a way in EEM ??

[vsraghav123]

Any ideas

[Giuseppe Larosa]

Hello Vsraghav123,

there is a feature called route profiling

http://www.cisco.com/en/US/docs/ios/iproute_pi/command/reference/iri_pi1.html#wp1012879

you need to enable it with

config t

ip route profile

and then you can consult a sort of log of route changes

using

show ip route profile

Hope to help

Giuseppe

[vsraghav123]

Hello Giuseppe,

Thanks for your response , I just browsed on this command but I was not able to find how to relate this logs and acheive my requirement that is if there is any route flap on primary link it should not revert the route back to the primary link for a certain period of time from backup link.Is there any sample configurations which I can try out in Lab , please help.

Raghavan

[Giuseppe Larosa]

Hello Raghavan,

IP route dampening may be the feature to use

http://www.cisco.com/en/US/docs/ios/ios_xe/iproute_pi/configuration/guide/iri_ip_event_damp_xe.html#wp1056241

this should work also with EIGRP and the idea is taken from BGP route dampening

Hope to help

Giuseppe

[vsraghav123]

Hello Giuseppe,

I went through the doument and it fits to my requirement , Will test this in GNS3 and will seak your help if needed , thanks again.

Raghavan