OSPF Stub Router Advertisement issue?

Unanswered Question
Apr 22nd, 2009
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I was experimenting with OSPF Stub Router Advertisement in my lab. I have a 6500 running 12.2(33)SXI. I notice that I'm unable to configure both gracefull shutdown and a delay on startup while awaiting for BGP convergence.


If I have:


router ospf 100

max-metric router-lsa external-lsa


I would want to do the above before a reboot. I'd also like to have:


max-metric router-lsa external-lsa on-startup wait-for-bgp


However, if I configure the above, it overrides the the first command, for the graceful shutdown. The switch ceases to advertise max-metrics to neighbors.


Is this a bug? Anyone else have an issue with this or are able to get graceful shutdown and the startup delay to work?


Thanks,

-Danny

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Giuseppe Larosa Wed, 04/22/2009 - 09:34
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Hello Danny,

a non stop forwarding device makes use of hardware based CEF tables to be able to foward traffic during a supervisor switchover.

if the device would use max-metric LSA during switchover the graceful restart procedure would be defeated neighbors wouldn't still send traffic to the device.


So I think this is not a bug but simply the right behavior of an NSF capable device.


the max-metric lsa should be used if you power on the chassis not during switchover.


Hope to help

Giuseppe


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