[c-nsp] DMVPN and OSPF

[Jay Nakamura]

Looking back on tickets, it seems like this problem started happening
after upgrading from 12.4(15)T5 to 12.4(24)T.  Before the upgrade, it
was running solid for a year.

I have tried 12.4(24)T1 but that doesn't seem to have any effect.  I
can't go below 12.4(20)T because we want to deploy IOS content
filtering.


> On Thu, Jul 30, 2009 at 7:48 AM, Rodney Dunn<rodunn at cisco.com> wrote:
>>
>>
>> Jay Nakamura wrote:
>>>>
>>>> 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
>>>
>>
>> No this one:
>>
>> http://supportwiki.cisco.com/ViewWiki/index.php/Tech_Insights:Utilizing_the_New_Packet_Capture_Feature
>>
>>
>>
>>> 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.
>>>
>>
>> Ok. That is the starting point if the neigbors are not flapping.
>>
>>
>>>> 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.
>>>
>>
>> Almost always issues like this are with packet loss. You have to make sure
>> the multicast traffic can traverse the cloud and that requires replication
>> at the hub..and the spoke if you are doing a single spoke tunnel with dual
>> hubs.
>>
>>
>>>
>>>> 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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>>
>