[c-nsp] DMVPN and OSPF

[Jay Nakamura]

> Did you force the DR to be the hub by setting the priority?

Yes.  And confirmed.

> I forgot, did you set it to broadcast or multipoint?

broadcast

> I'd suggest you look at the packet capture feature and get a trace when it's
> down.

Is this what you are referring to?

http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/ht_rawip.html#wp1049404

There is no tech onsite and it's a little far so I can't do it at the
moment but if I can't figure out anything else, that will be the next
step.

> Do you see the LSA's in the database?

I believe it was blank.  It's working now after a reboot so I can't
check but I will check next time it happens.

> Can you ping 224.0.0.5 and get a response?
>
> Are the neighbors flapping?

It didn't flap at all.  Routes just disappeared.  Well, that's not
100% true.  The backup hub VPN connection went down and it wouldn't
come up.  I could ping the primary hub tunnel IP when the routes were
gone but none of the other DMVPN peer IP.


> Jay Nakamura wrote:
>>
>> Has anyone seen this symptom?
>>
>> 1841, advanced IP feature set
>> DMVPN spoke and OSPF over the DMVPN
>>
>> Running 12.4(24)T
>>
>> Periodically, the router looses all it's OSPF routes and stays that
>> way.  Clearing the DMVPN or OSPF process does nothing.  It recreates
>> the OSPF session with neighbor but it still has no routes.  It can't
>> seem to re-connect to the backup DMVPN hub either.
>>
>> Router still routes to the static default route for internet traffic
>> and everything else seems normal.  Just can't get to the VPN network.
>>
>> It's really not doing anything fancy other than DMVPN and OSPF.
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