North American Network Operators Group

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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 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 advertisement from the Wild World, it
 stores it in its routing table; however R2 never takes it into account :
 its routing table only mentions , it doesn't mention the
 more specific routing entry

 Our Networks cannot get to Is it a feature of IBGP ??
 Thanks for any help,

Pascal Petit
 SYNET                                          tel:        33 1 4696 0040
 74, rue Roque de Fillol                    fax:       33 1 4696 0041
 92800 Puteaux                               email:    [email protected]