nanog mailing list archives
Re: Communities BCP [was: RE: BGP Path Filtering]
From: Guy Tal <guy () gblx net>
Date: Fri, 16 May 2003 17:28:37 -0500 (EST)
comments inline... On Fri, 16 May 2003, Stephen J. Wilcox wrote:
On Fri, 16 May 2003, Danny McPherson wrote:On 5/16/03 1:26 PM, "Jay Ford" <jay-ford () uiowa edu> wrote:You can & definitely should strip those community values on announcements you receive from EBGP peers. Interesting things happen if you let others turn your routing policy knobs when you think they can't reach them.\Agreed. Likewise, when you receive communities (and MEDs, ugh!) [if possible] you should reset them (v. employing 'additive'). Unnecessary propagation and/orHmm.. assuming you're interconnecting at multiple points with the same ASN they will probably want to indicate to you where to send traffic to them using MEDs, if you go stripping them out you lose that info, check the peering policy.. this may put you in breach. Even without a breach of policy the MED will help find the best path to a route thats identical at two points and if you take it out you lose that.
All a matter of perspective. I would assume most people want to use closest exit on their networks. Imagine how nice it would be if you could hand off traffic to a peer that is your closest exit, then force them to carry the traffic back to you at that same point from across the country or across the globe!
Altho I'd agree if you'd say to clear the communities and MEDs on egress, thats an okay thing to do.
Spank me if I'm wrong here, but you don't pass MEDs on transitively anyway. And if you strip communities off, you limit your peers/customers/providers from being able to use the same control that you are asking for. Guy Tal
Current thread:
- Re: BGP Path Filtering, (continued)
- 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)
- 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)
- Communities BCP [was: RE: BGP Path Filtering] Deepak Jain (May 16)
- Re: BGP Path Filtering Leo Bicknell (May 16)
- Re: BGP Path Filtering Sean Donelan (May 16)