IBGP problem concerning more specific routes

Tue Dec 2 20:03:53 UTC 1997

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 at synet.fr
 FRANCE                                         http://www.synet.fr   