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Cisco OSPF Graceful Shutdown

Posted on 2014-03-31
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Last Modified: 2014-04-16
We will performing network maintenance tonight and will need to take an OSPF neighbor down.  I've read on some Google searches on performing a graceful shutdown and wanted to see someone's take on it.

I need to shutdown the OSPF on our 6509 and then re-enable it with a port channel configuration.  Can i use the "max-metric router-lsa" command against router ospf 100 to force this device to start shifting traffic to different routers/OSPF neighbors?

The 6509 is connected to 2 ASR's (Level 3 & Sprint) and another 7609 (which is also connected to L3 & Sprint). I need to shutdown interface gi 4/45 (facing the ASR L3) in order to upgrade to a 2gb port-channel and restore OSPF.  Is there a better method of performing a graceful shutdown?

Basic Topology attached

Red links indicate new PORT-CHANNEL


Thanks in advance!
Rob
Topology.png
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Question by:Robs1999
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Hassan Besher earned 1000 total points
ID: 39968041
Achieving HA uptimes when you need to do maintenance is far from simple, even if you tweak your hello timers, or use some fast detection protocol like BFD it still takes time for your protocols to converge. A much better solution would be gracefully notifying a router’s neighbors of a dramatic cost increase on all of it’s interfaces which would force an SPF calculation while the router is still online forwarding packets.

The new metric in the LSA does not cause the path to be ignored, it just increases the cost. The other routers in the network will select any alternate paths (if available).
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