Clear BGP damping or flap-statistics in a VRF?

[rknuttila]

Hi,

I'm trying to find a way to clear BGP dampening or flap-statistics in a VRF - I'm using an ESR 10008 w/IOS 12.0(28)S2. So far, the docs and online help don't seem to indicate that choice. Does anyone know the correct syntax?

Thanks,

Reid Knuttila

[Harold Ritter]

The command is:

r1#clear ip bgp vpnv4 unicast dampening ?

A.B.C.D Network to clear damping information

r1#clear ip bgp vpnv4 unicast dampening

Hope this helps,

[rknuttila]

Mark,

Thanks for the response. I can't seem to get the command to work on the 12.0S code on PRE-1 (ESR 10k). Here's what I see:

pllbpe1#sh ip bgp vpnv4 vrf adtech dampening flap-statistics | include 51.0.0.0

h 51.0.0.0/20 172.31.10.2 2 00:03:40 65002

pllbpe1#clear ip bgp vpnv4 unicast flap-statistics 51.0.0.0 255.240.0.0

% Network not in table

I've tried the above on a few samples of the thousands of routes in the VRF table and none of them work - always "% Network not in table"

.

My Cisco SE just told me that there are no commands in 12.0(28)S for what I referred to, nor are there plans to put it in 12.0S.

But it does work in 12.2S! If I move to a different platform which can run 12.2S (a 7600) then the 'vrf' argument exists and I can clear flapping

[Harold Ritter]

Try without the prefix. I think the command will only work globally.

Hope this helps,

[Harold Ritter · Accepted solution]

Your SE is right. Dampening can't be eanbled per VRF. If you enable it under one VRF, it is enabled for all VRFs.

The support for dampening per VRF is on the roadmap but just not there yet.

The command "clear ip bgp vpnv4 unicast dampening" will clear all the dampening info for all VRFs connected to the PE on which the command is issue.

Hope this helps,

[maher]

Dear Hritter,

Forgive me, I would like to know, what are the consequences that we have to do clear ip bgp vpnv4 unicast dampening? Is it related to BGP route dampening?

Any related technical document ?

thanks in advance.

maher

[Harold Ritter]

Maher,

This is indeed BGP route dampening. Clearing the dampening info using the "clear ip bgp vpnv4 unicast dampening" will cause the penalty to be cleared for all prefixes in all VRFs connected to the specific PE. As a result, any routes that were suppressed because of their penalty will start being used again.

Hope thi helps,

[maher]

Hi Hritter,

Thanks for the input.

regards,

maher