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IBGP problem concerning more specific routes

  • From: Pascal Petit - SYNET
  • Date: Tue Dec 02 15:38:58 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@synet.fr
 FRANCE                                         http://www.synet.fr   





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