Whatis the cause of link Fluctuation?

Unanswered Question
Mar 29th, 2009

The following serial interface s1/3 is fluctuating. herewith, I have provided the log file. how to resolve this problem..

Log Buffer (4096 bytes):

: Process 1, Nbr 10.220.10.254 on Serial1/3 from EXCHANGE to DOWN, Neighbor Down

: Too many retransmissions

Mar 30 09:08:38: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

DOWN to DOWN, Neighbor Down: Ignore timer expired

Mar 30 09:11:09: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Too many retransmissions

Mar 30 09:12:09: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

DOWN to DOWN, Neighbor Down: Ignore timer expired

Mar 30 09:14:49: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Too many retransmissions

Mar 30 09:15:49: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

DOWN to DOWN, Neighbor Down: Ignore timer expired

Mar 30 09:19:28: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Too many retransmissions

Mar 30 09:20:28: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

DOWN to DOWN, Neighbor Down: Ignore timer expired

Mar 30 09:22:59: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Too many retransmissions

Mar 30 09:23:59: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

DOWN to DOWN, Neighbor Down: Ignore timer expired

Mar 30 09:27:08: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Too many retransmissions

Mar 30 09:28:08: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

DOWN to DOWN, Neighbor Down: Ignore timer expired

Mar 30 09:29:55: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/3, chan

ged state to down

Mar 30 09:29:56: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Interface down or detached

Mar 30 09:29:59: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/3, chan

ged state to up

Mar 30 09:30:01: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/3, chan

ged state to down

Mar 30 09:30:05: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/3, chan

ged state to up

Mar 30 09:33:01: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Too many retransmissions

Mar 30 09:34:01: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

DOWN to DOWN, Neighbor Down: Ignore timer expired

Mar 30 09:37:36: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Too many retransmissions

Mar 30 09:38:36: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

DOWN to DOWN, Neighbor Down: Ignore timer expired

Mar 30 09:46:36: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Too many retransmissions

Mar 30 09:47:36: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

DOWN to DOWN, Neighbor Down: Ignore timer expired

Mar 30 09:50:46: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Too many retransmissions

Mar 30 09:51:46: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

DOWN to DOWN, Neighbor Down: Ignore timer expired

Mar 30 09:53:19: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Dead timer expired

Mar 30 09:55:15: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/3, chan

ged state to down

Mar 30 09:55:52: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/3, chan

ged state to up

Mar 30 09:59:32: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

EXCHANGE to DOWN, Neighbor Down: Too many retransmissions

Mar 30 10:00:32: %OSPF-5-ADJCHG: Process 1, Nbr 10.220.10.254 on Serial1/3 from

DOWN to DOWN, Neighbor Down: Ignore timer expired

I have this problem too.
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Istvan_Rabai Mon, 03/30/2009 - 01:21

Hi Vinoth,

Could you please check the following on the adjacent OSPF routers:

1. If the ip mtu's of the serial interfaces are the same:

command:

show ip interface s1/3

2. If the ospf network types of the serial interfaces are matching.

command:

show ip ospf interface s1/3

Please come back with your results.

Thanks:

Istvan

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