OSPF planned Graceful Restart

[ecitele10]

Hi ,

I am not sure that I understand how Cisco initiates a OSPF Planned Graceful Restart PROCESS. Below link shows configuration of OSPF GR.

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/gr_ospf.html

Unfortunately I could not find the way Router begins sending Grace LSA (I mean begin GR)and when it implements a reset for restart.

If you know how does it work , I would appreciate your help.

Thanks,

Dmitry Petrunin

[Jon Marshall]

Dmitry

It depends on what started the reload of the router.

1) if the reload is a planned reload then the router will send out grace LSAs before it reloads

2) if the reload is due to an RP crashing for example then the router cannot send out grace-lsa until it has reloaded and come back up.

full details of what happens with a planned and unplanned reload can be found in the RFC -

http://www.faqs.org/rfcs/rfc3623.html

Jon

[ecitele10]

Jon,

That exactly is a question what is a CLI command to start the planned GR PROCESS ?

For unplanned it's pretty obvious.

Once GR was enabled , restart-interval was set what should be trigger/command to begin GR?

10x,

Dmitry

[Jon Marshall]

Dmitry

I understand what you mean now and am still looking for the answer

All the documentation i have read from Cisco so far only talks about graceful LSAs being issued on restart. Perhaps this is the way Cisco designed it. Or perhaps when you issue the reload command one of the things the router does before reloading is to issue a graceful LSA.

Unfortunately i don't have the equipment to run this at home

Jon