[c-nsp] Identifying BGP route flapping

[Hank Nussbacher]

At 04:12 PM 09-04-08 -0500, Frank Bulk wrote:

Not sure if this will help but we use:

router bgp xxx
  bgp log-neighbor-changes
and
snmp-server enable traps bgp

and in our IOS log we usually find things like:

Mar 17 15:03:06: %BGP-5-ADJCHANGE: neighbor xxx.139.217.2 Down BGP 
Notification received
Mar 17 15:03:16: %BGP-5-ADJCHANGE: neighbor xxx.139.217.2 Up
which help us determine BGP peer flaps.

Regards,
Hank

>We're not that desperate to monitor BGP flaps to install a router, and even,
>that's not a counter, is it?
>
>
>
>Sounds like there's no nice option to measure instability.
>
>
>
>Frank
>
>
>
>
>
>From: Mike Johnson [mailto:harbor235 at gmail.com]
>Sent: Wednesday, April 09, 2008 10:54 AM
>To: Adam Armstrong
>Cc: frnkblk at iname.com; cisco-nsp at puck.nether.net
>Subject: Re: [c-nsp] Identifying BGP route flapping
>
>
>
>That will work for local BGP flaps, but if you are trying to monitor BGP
>flaps on the net this will not work.
>You could setup a router that has BGP dampening enabled, this will give you
>a look into flaps
>on the net.
>
>harbor235 ;}
>
>On Wed, Apr 9, 2008 at 11:48 AM, Adam Armstrong <lists at memetic.org> wrote:
>
>Frank Bulk wrote:
> > We had an incident a little over a week ago where our upstream provider
> > (which managers our edge routers) told us that the BGP routes were
>flapping
> > between our two edge routers.
> >
> > Is there a MIB that we can poll to monitor the number of changes in
>routing
> > tables, or BGP flaps?
> >
>You can find out when the session last changed, how many messages have
>been sent across the session and how many updates have been sent across
>the session.
>
>Sadly i don't think there's a flap counter you can poll.
>
>adam.
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