nanog mailing list archives
Re: Max Prefixes Configured on Customer BGP
From: Leo Bicknell <bicknell () ufp org>
Date: Fri, 16 Aug 2002 09:27:34 -0400
In a message written on Thu, Aug 15, 2002 at 11:41:17PM -0400, Richard A Steenbergen wrote:
IMHO, using only prefix limits on a customer is actually doing them (and the rest of the internet that listens to your announcements) a disservice.
I think you might be missing a highly useful case of using max-prefix with customers. Many customers will want to deaggregate their blocks, and/or leak more specifics. While I don't want to argue if that is good or not, the end result is most ISP's allow this in some form. Consider the difference between: Case 1: a.b.0.0/16 exact match prefix filter Customer calls in, asks for change. a.b.0.0/17 + a.b.128.0/17 exact match prefix filter. Case 2: a.b.0.0/16 le 19, max prefix 6 The second case allows customers to make changes with no delays, and reduces the amount of work for the ISP. It still enforces some level of aggregation automatically to protect the system, but also gives the customer some flexability. Generally I'd recomend something around twice the number of prefixes, with some sort of floor. So, if you registered 200 prefixes, you could announce 400 routes from them, with a maximum length as set by your ISP. -- Leo Bicknell - bicknell () ufp org - CCIE 3440 PGP keys at http://www.ufp.org/~bicknell/ Read TMBG List - tmbg-list-request () tmbg org, www.tmbg.org
Current thread:
- Re: Max Prefixes Configured on Customer BGP, (continued)
- Re: Max Prefixes Configured on Customer BGP Niels Bakker (Aug 15)
- Re: Max Prefixes Configured on Customer BGP Joe Wood (Aug 15)
- Re: Max Prefixes Configured on Customer BGP Niels Bakker (Aug 15)
- Re: Max Prefixes Configured on Customer BGP Peter E. Fry (Aug 15)
- Re: Max Prefixes Configured on Customer BGP Joe Wood (Aug 15)
- Re: Max Prefixes Configured on Customer BGP Richard A Steenbergen (Aug 15)
- Re: Max Prefixes Configured on Customer BGP Joe Wood (Aug 15)
- Re: Max Prefixes Configured on Customer BGP Jared Mauch (Aug 15)
- HPOV, Ciscoworks Blake Fithen (Aug 15)
- Re: Max Prefixes Configured on Customer BGP (WAS Re: ALGX problems?) Joe Wood (Aug 15)
- Re: Max Prefixes Configured on Customer BGP (WAS Re: ALGX problems?) Mark Kent (Aug 15)
- Re: Max Prefixes Configured on Customer BGP (WAS Re: ALGX problems?) Joe Wood (Aug 15)