CCIE Pursuit Blog

April 7, 2009

Core Knowledge Question of the Day: 07 April 2009

Does filtering an inbound OSPF prefix with a distribution list remove that prefix from the routing table of neighboring OSPF routers?  Why or why not?

Highlight for answer: No. While the route is not installed in the local routing table, the LSA is not filtered and is flooded to OSPF neighbors.

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1 Comment »

  1. No. Each router in an area has the copy of the database, which is why it’s generally not recommended to filter with distribute lists inbound. All other routers will have the full copy, causing unexpected (or intentional :)) results.

    -ryan

    Comment by ryan — April 7, 2009 @ 11:38 am | Reply


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