[c-nsp] OSPFv3 down every 34 minutes

[Ben Steele]

Does a "sh standby 1" show any hsrp state changes? might also be worth  
setting up an ip sla probe to your neighbor for the 34 minutes to  
probe every second and just see if it fails at all when you lose your  
OSPF neighbor, that way you can discard OSPF from the problem and look  
into what is causing your dataflow issue.

Ben

On 13/04/2008, at 11:10 PM, Eric Van Tol wrote:

> Hi Brad,
> Thanks for the response.  I saw those drops, but they don't come  
> close to the amount of times this is occurring.  This happens  
> literally, every 34 minutes (okay, 33 minutes and some seconds :-) ):
>
> Apr 13 06:13:03 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.10 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 06:13:03 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.9 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 06:13:07 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.11 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 06:46:52 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.10 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 06:46:53 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.9 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 06:46:57 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.11 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 07:20:35 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.10 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 07:20:36 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.11 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 07:20:40 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.9 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 07:53:48 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.10 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 07:53:49 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.11 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 07:53:52 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.9 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 08:27:36 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.11 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 08:27:37 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.10 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 08:27:42 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.9 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 09:01:31 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.10 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 09:01:31 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.11 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
> Apr 13 09:01:35 EDT: %OSPFv3-5-ADJCHG: Process 600, Nbr x.x.x.9 on  
> Vlan2 from FULL to DOWN, Neighbor Down: Too many retransmits
>
> The interfaces all show the same info:
>
>  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output  
> drops: 0
>
> On the Vlan2 interface, I show one more drop since I sent the  
> original message on Friday:
>
>  Input queue: 0/75/17/17 (size/max/drops/flushes); Total output  
> drops: 0
>
> I'm baffled at this point.  I'll likely be moving to IS-IS soon, but  
> this is one of those problems that really makes you wonder.
>
> ________________________________________
> From: Brad Henshaw [brad.henshaw at qcn.com.au]
> Sent: Sunday, April 13, 2008 9:13 AM
> To: Eric Van Tol; cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] OSPFv3 down every 34 minutes
>
> Eric Van Tol wrote:
>
>> In any case, the question now is, what would cause so many
>> neighbors to retransmit and why on only one router?
>
> Packet loss or congestion on the physical links/interfaces
> connecting to this router?
>
> Not sure why it'd be every 34 minutes though. If it were every
> /30/ minutes, the OSPF refresh would be a real suspect.
> I notice input drops are shown for int vl2. Check these for
> the relevant physical interface(s) also.
>
> ~Brad
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