[c-nsp] OSPF flapping between Nexus 7000 and ASR 1001x

Łukasz Bromirski lukasz at bromirski.net
Wed Jul 17 09:54:33 EDT 2019

> On 9 Jul 2019, at 17:58, Richard Mikisa <rmikisa at gmail.com> wrote:
> Hi All,
> I am running OSPF across a point to point link between a Nexus 7000
> and an ASR1000x.
> The OSPF works fine but every couple of hours, it breaks and neighbor
> state goes into EXCHANGE and remains there for another 40 minutes or
> so. It then goes into full, OSPF comes up and all is well for another
> couple of hours or so and then the cycle starts again. All the time,
> IP connectivity between the two point to point IPs is up.

Apart from OSPF config changes already mentioned, check what’s going
on in your CoPP policies on both ends. This doesn’t look like a directly
config-related problem, rather environmental (like circuit switchover and
problems with MTU) but it may also be something related to amount
of traffic hitting CoPP policies from time to time and OSPF traffic overflowing
defined queues.

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