More on OSPF route selection

From: Roberto Fernandez (rofernandez@us.telefonica.com)
Date: Thu May 18 2006 - 20:49:13 ART

Friends,

Thanks for your previous answers, can we establish the following?

1 - OSPF always prefers intra-area over inter-area.

This means that given an existing intra-area route, for a given
destination; there is no way to trick OSPF into including on the routing
table an inter-area route (for the same destination), regardless the
metric values.

2 - The only way to trick OSPF into including new routes on the routing
table for a given destination is working on metrics, (through interface
cost, neighbor cost or auto cost)

Now a remaining question:

If there are two inter-area routes on a given ABR (R2), one coming
through area0 (through R1) and the other coming from area1(through R2),
It is there any known trick to make OSPF include the area1 route
together with the area0 route?

        ---R2--

       / |

A-0 / |

     / |

R1 | A-1

                                        \ |

A-0 \ |

                                           \ |

                                            --- R3--

Best Regards,

Roberto

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