OSPF summary-address

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Apr 3rd, 2007
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Why does the following not work?

router ospf 1

redistribute connected


I expect OSPF to distribute a default route but instead OSPF stops announcing any routes!

Any ideas?

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Harold Ritter Tue, 04/03/2007 - 06:23
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The only mean to inject the default route in an OSPF autonomous system is through the use of the command "default-information" originate.

Hope this helps,

sundar.palaniappan Tue, 04/03/2007 - 06:38
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The 'summary-address' command is used in ASBR, router connecting to an external AS, and I am guessing this router may be connected to your ISP.

If that's the case then just like Harold stated configure 'default-information originate' under your OSPF process and the router would continue to inject a default route as long as it has a default route in it's routing table.



davegibelli Tue, 04/03/2007 - 07:10
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With bgp you will not get a default route from a peer so there is no default route in your routing table in the first place.

I want to summarise all bgp routes into a default route and only inject this default into ospf if the bgp session is up...

davegibelli Tue, 04/03/2007 - 07:25
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I have two bgp routers, each has a single peering session. I want each bgp router to annouce a default route into ospf but only if the bgp session is up.

Sounds simple but I cannot figure out how!


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