nanog mailing list archives
Re: BGP4 COMMUNITY attribute
From: "John W. Stewart III" <jstewart () isi edu>
Date: Thu, 27 Mar 1997 14:34:59 EST
What is the general concensus about passing communities in the "community"?
i could see a reason for a subscriber passing communities through a mid-level provider to a top-level provider. but i'm not sure if it makes sense [yet] for top-levels to pass communities between themselves
1. Is COMMUNITY a transitive attribute only between me and my immediate upstream supplier or is it being propagated further into Internet (so I can influence how somebody ,say, 5 AS hops away from me sees my routes) ?the attribute is defined as transitive (i.e., once associated with a route it *stays* associated with the route). however, inUnless an intermediate provider deliberately changes the value, as opposed to appending to it.
these values aren't an end-to-end thing .. it's simply a way for providers to more easily facilitate routing policies. your comment implies somebody being a bad guy...
practice, many providers are configured to not send communities to other providersIs this a conscious decision or just that they have not turned on "send-community"?
both. they don't turn on send-community so that others don't see their communities. maybe they have some whiz-bang features that make configing their neat really cool, and they don't want others to see their communities because it might imply a way for others to do the same thing without the same amount of work /jws - - - - - - - - - - - - - - - - -
Current thread:
- BGP4 COMMUNITY attribute Walter Towbin (Mar 27)
- Re: BGP4 COMMUNITY attribute John W. Stewart III (Mar 27)
- Re: BGP4 COMMUNITY attribute John Scudder (Mar 27)
- Re: BGP4 COMMUNITY attribute Dave Siegel (Mar 28)
- Re: BGP4 COMMUNITY attribute John Scudder (Mar 27)
- Re: BGP4 COMMUNITY attribute Paul Knight (Mar 27)
- Re: BGP4 COMMUNITY attribute Alexandre Leib Grojsgold (Mar 27)
- <Possible follow-ups>
- Re: BGP4 COMMUNITY attribute Paul G. Donner (Mar 27)
- Re: BGP4 COMMUNITY attribute John W. Stewart III (Mar 27)
- Re: BGP4 COMMUNITY attribute Randy Bush (Mar 27)
- Re: BGP4 COMMUNITY attribute John W. Stewart III (Mar 27)
- Re: BGP4 COMMUNITY attribute Paul G. Donner (Mar 27)
- Re: BGP4 COMMUNITY attribute John W. Stewart III (Mar 27)
- Re: BGP4 COMMUNITY attribute George Matey (Mar 30)
- Re: BGP4 COMMUNITY attribute John W. Stewart III (Mar 27)