From: Koen Peetermans (K.Peetermans@chello.be)
Date: Sun Jul 11 2004 - 13:10:45 GMT-3
Thanks.
The one that's bugging me, however, it that if AS65038 sets a high weight
for routes coming from 65267, it will forward these prefixes to AS65145, but
won't advertise the same routes to AS65267 anymore. It forwards just the
best routes apparently.
This sounds like IBGP to me, since EBGP will forward all prefixes to all
peers. Inside a confederation this doesn't seem to be the case ?
Kind regards,
Koen.
________________________________________
From: Tom Rogers [mailto:cccie71@yahoo.com]
Sent: zondag 11 juli 2004 17:43
To: Koen Peetermans; ccielab@groupstudy.com
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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