[c-nsp] Cisco 7206VXR OSPF

[Jason Berenson]

Rodney,

They connect back to a cisco switch.  No errors anywhere along the 
ethernet and no packet loss.  It also only flapped 3 times yesterday and 
2 times 5 days ago, so it's not a constant flap.

It hasn't flapped yet today, so I'll turn on debugging and setup a snoop 
and write back when I have something.  About the debugging - will 
turning on the commands suggested (ospf event or ospf adj)  have an 
averse affect on the routers performance?

Thanks,
Jason

Rodney Dunn wrote:
> What is the physical topology?
>
> Is it back to back ethernet?
>
> On Wed, Mar 12, 2008 at 11:37:42AM -0400, Jason Berenson wrote:
>   
>> Joe,
>>
>> I checked the neighbors too.  I do see the session flap there but again, 
>> no errors on the ethernet and nothing really obvious as to why it 
>> flapped.  This just started in the past few days.  I do see some CPU 
>> spikes to 100% but it doesn't correlate exactly to when the flap occurred.
>>
>> -Jason
>>
>> Joe Freeman wrote:
>>     
>>> If OSPF is flapping, you should see it on the neighbor attached to 
>>> that interface as well, so you might look there for issues.
>>>
>>> Joe
>>>
>>> On 3/12/08, *Jason Berenson* <jason at pins.net <mailto:jason at pins.net>> 
>>> wrote:
>>>
>>>    Rodney,
>>>
>>>    The interface is clean.  No errors/drops at all.  I think I'll have to
>>>    snoop that segment like you suggested and wait for it to flap again.
>>>
>>>    Thanks,
>>>
>>>    Jason
>>>
>>>
>>>    Rodney Dunn wrote:
>>>    > Look for intput drops on the 'sh int'.
>>>    >
>>>    > If you don't see any you probably need a sniffer trace on the
>>>    > ethernet segment.
>>>    >
>>>    > On Tue, Mar 11, 2008 at 03:53:30PM -0400, Jason Berenson wrote:
>>>    >
>>>    >> Greetings,
>>>    >>
>>>    >> We have a few 7206's running OSPF/BGP for routing.  All of the
>>>    routers
>>>    >> are fine except for one - I noticed a few times in the past
>>>    week where
>>>    >> OSPF/BGP flapped and came back right away.
>>>    >>
>>>    >> I checked CPU and noticed it peaked in the past hour but that
>>>    doesn't
>>>    >> really correlate to the time the routing sessions flapped.  I also
>>>    >> didn't see the ethernet connection go down and I don't see any
>>>    errors on
>>>    >> either side of the ethernet.
>>>    >>
>>>    >> If there are any outputs anyone would expect please let me know
>>>    and I'll
>>>    >> promptly reply.  This is the first time I'm faced with a
>>>    problem like
>>>    >> this so I'm not really sure where to look other then the things
>>>    I've
>>>    >> already tried.
>>>    >>
>>>    >> Much thanks in advance,
>>>    >> Jason Berenson
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