Unanswered Question
Apr 2nd, 2009
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I have a router that is running both BGP and OSPF.

BGP is learning the default route from its BGP neighbor.

I was going to redistribute the default route into OSPF with a route map and the “redistribute” command but I noticed that once I configured OSPF with the “default-information originate” command OSPF learned the correct default route and propagated it.

Does this mean I don't need to add the “redistribute BGP” command to my OPSF configuration?

Is this a good practice?

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Giuseppe Larosa Thu, 04/02/2009 - 05:36
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Hello Thom,

ospf default-information originate checks if there is a default route installed in the routing table if there is an OSPF LSA type 5 for is generated and propagated in the ospf domain.

unless you use the always keyword should the BGP session fall down the OSPF LSA will be removed.

This can be a good solution if this is your single exit point to internet.

in more complex scenarios you can invoke a route-map as option of default-information originate so that you can check from what BGP neighbor the is received for example

you don't need to redistribute bgp into ospf for this.

Hope to help


royalblues Thu, 04/02/2009 - 05:37
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When you configure the default-information originate command under ospf, it will generate & advertise a default route as long as it sees a valid entry in its routing table .

In your case the default is being learnt from BGP so when u configure the command under opsf it starts advertisign the default. If your requirement is to just propogate the default, you need not do redistribution


rakesh.hegde Mon, 05/18/2009 - 19:43
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You can not redistribute a default route into OSPF. You have to originate it using " default-information originate " command.




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