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OSPF down due to Retransmission Error

arun kumar
Level 1
Level 1

‎09-14-2007 12:02 AM - edited ‎03-03-2019 06:45 PM

Hello,

We have one downstream location connected on NSSA. OSPF neighborship between ABR and downstream router is getting flucutated. In "sh log" in ABR, i'm seeing the reason being "too many retransmissions"...

%OSPF-5-ADJCHG: Process 10, Nbr x.x.x.x on Serial1/0 from FULL to DOWN, Neighbor Down: Too many retransmissions

%OSPF-5-ADJCHG: Process 10, Nbr x.x.x.x on Serial1/3 from FULL to DOWN, Neighbor Down: Too many retransmissions

%OSPF-5-ADJCHG: Process 10, Nbr x.x.x.x on Serial1/6 from FULL to DOWN, Neighbor Down: Too many retransmissions

%OSPF-5-ADJCHG: Process 10, Nbr x.x.x.x on Serial1/3 from DOWN to DOWN, Neighbor Down: Ignore timer expired

%OSPF-5-ADJCHG: Process 10, Nbr x.x.x.x on Serial1/6 from DOWN to DOWN, Neighbor Down: Ignore timer expired

What could be the reason? Can anyone advise some work around for this ??

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thomas.anthony
Level 1
Level 1

‎09-14-2007 12:17 AM

you may need to check the MTU and physical counter parameters on interfaces connecting

OSPF neighbours - most likely causing this behaviour

check the bandwith as well

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