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Re: Max Prefixes Configured on Customer BGP

  • From: Jared Mauch
  • Date: Fri Aug 16 00:12:36 2002

	I believe you are correct as long as you inteligently apply
this restart-timer on max-prefix along with your dampening policy.

	YMMV depending on what your defaults are set for.

	- Jared

On Thu, Aug 15, 2002 at 09:09:15PM -0700, Joe Wood wrote:
> On Thu, 15 Aug 2002, Richard A Steenbergen wrote:
> > A better system might be where the session is kept up (or periodically
> > polled, if you want to make it obvious to the other party that there is a
> > problem) without installing the routes, and kept in a "quarantine" state
> > for X amount of time to make sure that things stay below a configured
> > number. This would be at least a slightly better way of recovering quickly
> > once the "problem" has passed, without mucking things up every 15 minutes
> > in the process.
> Couldn't you do this with route-dampening?
> So the first leak will of course be propagated before the max-prefix
> takes effect. But once these routes are withdrawn, this should
> create entries in the history table for these prefixes.
> Depending on your dampening parameters, you should be able to configure
> selective ASes to have very low tolerance for dampening, if you don't
> already have a low tolerance for dampening.... Once the BGP session is
> activated and if the offending prefixes reappear and trigger the
> max-prefix threshold and are then withdrawn again, BGP dampening should
> dampen the routes for 45 minutes or X, depending on your maximum
> suppression value........
> That X minutes should hopefully be enough time for customer to solve
> problem, or for the ISP NOC to get on the phone with the customer.
> While this still propagates the leaked routes at least twice, it does
> prevent the routes from being constantly propagated every 15 minutes....
> Please correct me if I'm wrong......The BGP Dampening route-map feature is
> new to me. ;>
> Regards,
> Joe

Jared Mauch  | pgp key available via finger from
clue++;      |  My statements are only mine.

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