[c-nsp] OSPF excessive retransmissions

[Karol Mares]

On 9/11/07, Mark Pace Balzan <mpb at melitacable.com> wrote:
>
> Hi,
>
>
> I have a number of cisco and non-cisco OSPF speakers on an ethernet lan
> that have been working ok for a while.
>
> I changed switch and added a new router (new boxes are cisco kit), and
> Im getting the following between some neighbours and the new box:
>
> 000799: Sep 11 07:26:14.252 CET: OSPF: Killing nbr 192.168.0.33 on
> GigabitEthernet2/39 due to excessive (25) retransmissions
> 000800: Sep 11 07:26:14.252 CET: OSPF: 192.168.0.33 address 192.168.1.67
> on GigabitEthernet2/39 is dead, state DOWN
> 000801: Sep 11 07:26:14.252 CET: %OSPF-5-ADJCHG: Process 100, Nbr
> 192.168.0.33 on GigabitEthernet2/39 from FULL to DOWN, Neighbor Down:
> Too many retransmissions
>
>
> Anyone has any clue what the cause for OSPF re-transmissions is, and any
> pointers to some explanations to understand whats happening - my search
> on CCO was rather futile unfortunately.
>
>
> Thanks
>
> Mark



Check out the MTU and physical counter parameters on  interfaces connecting
OSPF neighbours - most likely causing this behaviour

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