From: Bob Sinclair (bsin@cox.net)
Date: Sun Jul 11 2004 - 15:02:08 GMT-3
Tom,
AFAIK, it is true of all flavors of BGP that only the best path, the one
used locally, is eligible to be advertised. This includes EBGP, IBGP and
Confederation BGP. This is basic out of RFC 1771. If anyone can document
otherwise, please send it my way.
Bob Sinclair
CCIE #10427, CISSP, MCSE
www.netmasterclass.net
----- Original Message -----
From: "Tom Rogers" <cccie71@yahoo.com>
To: "Koen Peetermans" <K.Peetermans@chello.be>; <ccielab@groupstudy.com>
Sent: Sunday, July 11, 2004 11:42 AM
Subject: Re: BGP confederation prefix behaviour = IBGP ?
> I dont know the whole scenario here.... but if everything's equal under
bgp route selection criteria, then on 65038 as router will select the oldest
route as the best route and then then from the lowest router-id (change the
router-id for if u want to a route preferred and reboot)
>
> Koen Peetermans <K.Peetermans@chello.be> wrote:Hi,
>
> I was wondering about BGP confederation functionality which I experienced
on
> an IEWB lab (#8) :
>
> Is it true that Confederation peers in different Sub-as'es only will
forward
> the best prefix to eachother (like IBGP) ?
>
> For example :
>
> AS54 AS54
> | |
> EBGP EBGP
> | |
> CONF AS100 CONF AS100
> Sub-AS 65267 - Sub-as 65038 - Sub-as65145
>
> Sub-as 65038 will get the same BGP prefixes from both
> 65267 & 65145, but with different next-hops to AS54.
>
> However, it will select only the best path for a prefix and only send that
> further to the next sub-as ? Is this correct behaviour ?
> I check Internet Routing Architectures and Routing TCP/IP VOL II but
didn't
> find something describing this (maybe didn't look good enough).
>
> Thanks and kind regards,
>
> Koen.
>
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