OSPF problem

subashmbi · ‎02-24-2010

Hi All,

GigabitEthernet0/1 from FULL to DOWN, Neighbor Down: Dead timer expired
.Feb 23 2010 20:11:16.177 gmt: %OSPF-5-ADJCHG: Process 1, Nbr x.x.x.x

on GigabitEthernet0/1 from LOADING to FULL, Loading Done

Why these below error means?

I am using Point-to-point network type.

I am using hello interval 1sec and dead interval 3sec.

Scenario:--Rtr--Modem---------Vsat----------------Router.

francisco_1 · ‎02-24-2010

you timers are very low. That can cause the reload of OSPF...

Giuseppe Larosa · ‎02-24-2010

Hello Subashmbi,

the local node didn't see an OSPF message from neighbor for 3 seconds and declared down the neighbor.

The OSPF adjacency has been rebuilt.

I would suggest you to use a dead interval = 4 seconds to follow the 1:4 ratio of default timers.

The VSAT may introduce high delay also. So I would use even 5 or 6 seconds as dead interval

Check also the following:

interface counters with sh interface to see if there are errors

the QoS that is implemented on the link.

Not all Cisco platforms have a system queue to protect OSPF messages, check for output drops on the other side.

Hope to help

Giuseppe

subashmbi · ‎02-24-2010

Hi Guislar,

Thanks for the update.

Answer are inline

I would suggest you to use a dead interval = 4 seconds to follow the 1:4 ratio of default timers.

The VSAT may introduce high delay also. So I would use even 5 or 6 seconds as dead interval

I will tweak this parameters and update.

interface counters with sh interface to see if there are errors

the QoS that is implemented on the link.

I didn,t see any interface errors.Yes, QOS shaping is configured in this interface.

Not all Cisco platforms have a system queue to protect OSPF messages, check for output drops on the other side.

Yes, I am getting Output drops...

Regards,

Subash.c