nanog mailing list archives
Re: BGP Path Filtering
From: Joe Abley <jabley () isc org>
Date: Fri, 16 May 2003 20:20:39 -0400
On Friday, May 16, 2003, at 20:00 Canada/Eastern, Sean Donelan wrote:
Small ISPs with only a few eBGP neighbors (i.e. less than a dozen) anda few network prefixes (i.e. less than a 100) probablly should stick with hardcoded, explicit prefix and as-path filters. Coordinate the occasionalupdates to the filters with your upstreams (since they should befiltering your announcements on ingress anyway). You are less likely tomess things up, and its simplier to understand if another network engineer needs to debug things later.
Having being involved in cleaning up the networks of many small ISPs (by your definition of small) after they have been deployed by people long since departed, I completely disagree with your last sentence.
Maybe complexity is in the eye of the beholder, but ISPs which classify the routes they carry according to origin using community string attributes are much easier to debug and understand than those who specify their exit policy using hard-coded prefix and as-path filters all over the place.
I don't think "start messy and clean up later" is good advice. Do it right the first time, and grow smoothly without difficult migrations.
Joe
Current thread:
- Re: Communities BCP [was: RE: BGP Path Filtering], (continued)
- Re: Communities BCP [was: RE: BGP Path Filtering] Danny McPherson (May 16)
- Re: Communities BCP [was: RE: BGP Path Filtering] Danny McPherson (May 16)
- Re: Communities BCP [was: RE: BGP Path Filtering] Stephen J. Wilcox (May 16)
- Re: Communities BCP [was: RE: BGP Path Filtering] Guy Tal (May 16)
- Re: BGP Path Filtering Stephen J. Wilcox (May 16)
- Re: BGP Path Filtering Leo Bicknell (May 16)
- Re: BGP Path Filtering Sean Donelan (May 16)
- Re: BGP Path Filtering Leo Bicknell (May 16)
- Re: BGP Path Filtering Sean Donelan (May 16)
- Re: BGP Path Filtering Leo Bicknell (May 16)
- Re: BGP Path Filtering Leo Bicknell (May 16)
- Re: BGP Path Filtering Joe Abley (May 16)
- Re: BGP Path Filtering Sean Donelan (May 16)
- Re: BGP Path Filtering Joe Abley (May 17)
- Re: BGP Path Filtering Iljitsch van Beijnum (May 17)
- Re: BGP Path Filtering Sean Donelan (May 17)
- Re: BGP Path Filtering alex (May 18)
- Re: BGP Path Filtering Mark Radabaugh (May 16)