North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Communities BCP [was: RE: BGP Path Filtering]
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" <[email protected]> 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/or > > Hmm.. 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
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