Re: [c-nsp] OSPF flapping between Nexus 7000 and ASR 1001x
Hi all Issue was mismatched MTU. I reduced them down to 2000 after a ping sweep and its been steady since. On Thu, Jul 18, 2019 at 3:18 AM Mike wrote: > > On 7/17/19 6:54 AM, Łukasz Bromirski wrote: > >> On 9 Jul 2019, at 17:58, Richard Mikisa 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. > > > > You can do some debugging on ip ospf adjacency and such. I have seen > cases like this where there have been duplicate loopback ip's, duplicate > ptp link id's, and such, which cause similar results. The adjacency > debugging should give you more of a reason WHY the adjacency is going down. > > > Post your results if you find the cause. > > > Mike- > > ___ > cisco-nsp mailing list cisco-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ -- cheers Richard ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
Re: [c-nsp] OSPF flapping between Nexus 7000 and ASR 1001x
On 7/17/19 6:54 AM, Łukasz Bromirski wrote: >> On 9 Jul 2019, at 17:58, Richard Mikisa 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. > You can do some debugging on ip ospf adjacency and such. I have seen cases like this where there have been duplicate loopback ip's, duplicate ptp link id's, and such, which cause similar results. The adjacency debugging should give you more of a reason WHY the adjacency is going down. Post your results if you find the cause. Mike- ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
Re: [c-nsp] OSPF flapping between Nexus 7000 and ASR 1001x
> On 9 Jul 2019, at 17:58, Richard Mikisa 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. — ./ signature.asc Description: Message signed with OpenPGP ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
