[nsp] OSPF neighbour troubles

[Xavier]

Hi,

I've a problem with an OSPF area between a few Cisco routers and Livingston PM3 devices.
Since a few days, I've the following errors (every 5 mins) on a Cisco:

Jul 15 14:39:31 [a.b.c.d.229.213] 12980: Jul 15 13:39:30 CET: %OSPF-5-ADJCHG: Process 1, Nbr w.x.y.z on Vlan13 from EXSTART to DOWN, Neighbor Down: Too many DBD retransmitions
Jul 15 14:40:31 [a.b.c.d.229.213] 12981: Jul 15 13:40:30 CET: %OSPF-5-ADJCHG: Process 1, Nbr w.x.y.z on Vlan13 from DOWN to DOWN, Neighbor Down: Ignore timer expired

I reseted the OSPF process on all devices, same problem. When I shut down OSPF on w.x.y.z, I get the same error but coming from another one!

Any idea?
Nothing changed in the network, OS, ...

Xavier
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