BGP Route Dampening

Hi,

I did a BGP Route Dampening LAB today and tested it out. I found it quiet
amusing.

I have three autonomous systems connected as per the arrows below.

AS 100 (R1) -> (R2) AS 200 -> (R3) AS 300

AS 100 had a loopback address of 1.1.1.1 advertised into BGP. All neighbors
were up and running.

I enabled route dampening using the "bgp dampening" command and left the
default settings on AS200 and AS300 Routers.

I noticed if on AS100 I did a "clear ip bgp *" over and over to cause a
flapping link that the AS200 Routers R2 did not indicate that the
1.0.0.0/8network was flapping at all, only R3 in AS 300 would increase
the penalty
each time the route was withdrawn.

It seemed that route dampening only worked if the route was removed with an
update message to withdraw the route? Is this the correct behaviour I am
experiencing.

I'm using 3640's with IOS 12.4(10a)

Cheers,

Garth

Blogs and organic groups at http://www.ccie.net
Received on Thu Feb 18 2010 - 11:53:13 ART