[14157] in North American Network Operators' Group
IBGP problem concerning more specific routes
daemon@ATHENA.MIT.EDU (Pascal Petit - SYNET)
Tue Dec 2 15:35:03 1997
From: "Pascal Petit - SYNET" <ppetit@synet.fr>
To: <nanog@merit.edu>
Date: Tue, 2 Dec 1997 21:03:53 +0100
X-MDaemon-Deliver-To: nanog@merit.edu
Reply-To: ppetit@synet.fr
Here is an amusing BGP problem :
Wild Wolrd-----------R1--------------R2------Our Networks
There is an IBGP sesion running between R1 and R2. R2 advertises route
194.214.0.0/16 to R1. In our block there is a class C used by one of our
customer which is not directly connected to our network. This customer
advertises its class C to the Wild World via its own ISP.
R1 receives the 194.214.253.0/24 advertisement from the Wild World, it
stores it in its routing table; however R2 never takes it into account :
its routing table only mentions 194.214.0.0/16 , it doesn't mention the
more specific routing entry 194.214.253.0/24.
Our Networks cannot get to 194.214.253.0/24. Is it a feature of IBGP ??
Thanks for any help,
Pascal
------------------------------------------------------------------------
Pascal Petit
SYNET tel: 33 1 4696 0040
74, rue Roque de Fillol fax: 33 1 4696 0041
92800 Puteaux email: ppetit@synet.fr
FRANCE http://www.synet.fr
