nanog mailing list archives
Re: weird BGP cisco-ism?
From: Ravi Chandra <rchandra () cisco com>
Date: Fri, 11 Jul 1997 00:58:51 -0700
add a default-metric under router bgp.. I think the source of the route in the routing table is changing for some reason and the box is conveying the metric as MED... --raviDid that. It went from advertising it with an MED of 0 to an MED of 20 and back, to just readvertising it over and over with the fixed default MED I'd set (1).
This indicates that your flap is fixed.. the neighboring AS will look at these advertisments as duplicate and discard it (and hence no dampening). To avoid readvertising the same prefix, you might want to check if there is any other dynamic protocol that is installing that prefix in the routing table and removing it (could be a OSPF subnet...)
The sad thing is that until flap damping code was added, this sort of bug was masked... but now I have a few dozen customers totally offline.
As soon as the reuse interval kicks in they should be fine.. --ravi
-matthew
Current thread:
- weird BGP cisco-ism? Matthew Kaufman (Jul 10)
- Re: weird BGP cisco-ism? Ravi Chandra (Jul 11)
- <Possible follow-ups>
- Re: weird BGP cisco-ism? Danny McPherson (Jul 11)
- Re: weird BGP cisco-ism? Matthew Kaufman (Jul 11)
- Re: weird BGP cisco-ism? Matthew Kaufman (Jul 11)
- Re: weird BGP cisco-ism? Ravi Chandra (Jul 11)