nanog mailing list archives
Communities BCP [was: RE: BGP Path Filtering]
From: "Deepak Jain" <deepak () ai net>
Date: Fri, 16 May 2003 14:50:09 -0400
I like using BGP communities: o filter announcements you receive from downstreams based on your criteria of choice o set a specific BGP community (yourAS:whatever) on announcements which are to be propagated to various places (upstream providers, etc.) o do output filtering based on the communities you set Make sure you clear yourAS:whatever in announcements from your BGP peers. You can use this same technique for prefixes you originate, so that all your outbound BGP filtering is based on communities.
I am hijacking this thread a bit. Setting communities is excellent advice especially if you are just starting out with downstream ASes. The question is that changing your communities down the road might be a big headache depending on whether you'll come to need more advanced ways of filtering your announcements than coarse communities allow. Especially when going (through growth or acquisition) from a single metro network to a multi-metro or national/international one. What criteria does the community think should be used when specifying communities. IMO, overspecificity [sp?] doesn't hurt, but others may (and have) disagreed. What's the BCP? Thanks, Deepak Jain AINET
Current thread:
- BGP Path Filtering Mark Radabaugh (May 15)
- Re: BGP Path Filtering Brian Wallingford (May 15)
- Re: BGP Path Filtering Jay Ford (May 15)
- Communities BCP [was: RE: BGP Path Filtering] Deepak Jain (May 16)
- Re: Communities BCP [was: RE: BGP Path Filtering] Daniel Golding (May 16)
- Re: Communities BCP [was: RE: BGP Path Filtering] Joe Abley (May 16)
- Re: Communities BCP [was: RE: BGP Path Filtering] Jay Ford (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] Danny McPherson (May 16)
- Re: Communities BCP [was: RE: BGP Path Filtering] Richard A Steenbergen (May 16)
- Re: Communities BCP [was: RE: BGP Path Filtering] Guy Tal (May 16)
- Re: Communities BCP [was: RE: BGP Path Filtering] Leo Bicknell (May 16)
- Re: Communities BCP [was: RE: BGP Path Filtering] Danny McPherson (May 16)
- Communities BCP [was: RE: BGP Path Filtering] Deepak Jain (May 16)