Mailing List Archive

Tommy,

Not sure what the accepted wisdom is here, but if you only have one
border router announcing 10.0.0.0/8 and that router fails, then the
other border routers will withdraw the route even if the 10.0.0.0
network is still active.
Marcus.

-----Original Message-----
From: TMS [mailto:tomek@absolut.vinyl.pl]
Sent: 26 September 2002 16:20
To: cisco-nsp@puck.nether.net
Subject: [nsp] IBGP mesh and 'network' command


Hello
I configured IBGP mesh using three cisco routers. And I used 'network
10.0.0.0' (in "router bgp XXX" configuration) command on each router.
So, for now each router announcing 10.0.0.0/8 network to each other. Is
this correct ? Maybe I should use "network 10.0.0.0" only on one router
? Which method is correct ?

best regards,
Tommy
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hi,

On Thu, Sep 26, 2002 at 05:38:23PM +1000, Marcus Keane wrote:
> Not sure what the accepted wisdom is here, but if you only have one
> border router announcing 10.0.0.0/8 and that router fails, then the
> other border routers will withdraw the route even if the 10.0.0.0
> network is still active.

This is one aspect. The other thing to keep in mind is: if you have
multiple routers, every one of them generates a 10.0.0.0/8 announcement,
and one of them looses his connection to the remaining routers, you do
*not* want that box to announce the BGP route to its peers (because it
can't reach the core anymore).

So the answer is (like about everything related to BGP) "it depends on
what you want to achieve".

I strongly recommend the Halabi book, as it discusses all those issues.

gert
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Gert Doering - Munich, Germany gert@greenie.muc.de
fax: +49-89-35655025 gert.doering@physik.tu-muenchen.de