On Mon, Dec 19, 2011 at 10:08:52AM +0100, Arnold Nipper wrote:
Inspired by discussion on "Announce less specific prefix in routeserver environment for upstream purpose (Message-ID: <4EEB4448.7070007@de-cix.net>) I would like to air the idea to modify the behaviour of BIRD as a route server.
The idea of a route server is that it "... reduces modifications to advertised route attributes to be transparent (for example does not prepend its AS number to AS PATH attribute and keeps MED attribute)."
However in case that there is a BGP speaker (gateway GW ) which is in the same ASN as the RS it is at least necessary to add the own ASN when announcing prefixes originating in the ASN.
Hence I would like to propose to modify
do not prepend own AS number
to
do not prepend owwn AS number except for prefixes learnt from iBGP
Does that make sense?
Yes, it does make sense to me, because it is consistent with the current behavior on local (i.e. non-BGP) routes exported to BGP RS session. Note that there is a draft on RS behavior, which does not mention this: http://tools.ietf.org/html/draft-jasinska-ix-bgp-route-server-03 -- Elen sila lumenn' omentielvo Ondrej 'SanTiago' Zajicek (email: santiago@crfreenet.org) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so."