modification request for rs client feature

[Ondrej Zajicek]

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 at 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 at 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."
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