[c-nsp] OSPF Bad Checksum

[virendra rode //]

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Hi,

For some reason we are receiving bad checksum messages from a couple of
our remote sites.

There hasn't been any configuration or hardware changes on these devices
that we know of. The area range and network summarization looks good for
these sites. Our hub site has other sites hanging off the interface so
we know its not the receiving router's interface.


What we haven't done so far,

1. change the cable
2. use different port
3. debug ip ospf for packet analysis.


I want to know if any of you has experienced this kind of problem as we
cannot find nice explanation as to why this is happening. Any further
insight will be appreciated.




site-a#show ver | incl IOS
IOS (tm) C2600 Software (C2600-JS-M), Version 12.2(19a), RELEASE SOFTWARE
(fc2)


Sep  4 00:29:06.970: %OSPF-4-ERRRCV: Received invalid packet: Bad Checksum
from x.x.x.x, Serial0/0.1
Sep  4 02:12:16.265: %OSPF-4-ERRRCV: Received invalid packet: Bad Checksum
from  x.x.x.x, Serial0/0.1
Sep  4 11:18:44.009: %OSPF-4-ERRRCV: Received invalid packet: Bad Checksum
from  x.x.x.x, Serial0/0.1
Sep  4 12:29:07.951: %OSPF-4-ERRRCV: Received invalid packet: Bad Checksum
from  x.x.x.x, Serial0/0.1



site-b#sh ver | incl IOS
IOS (tm) C2600 Software (C2600-JS-M), Version 12.2(16a), RELEASE SOFTWARE
(fc2)

Sep  4 11:31:22.368: %OSPF-4-ERRRCV: Received invalid packet: Bad Checksum
from  x.x.x.x, Serial0/0.1
Sep  4 11:55:46.006: %OSPF-4-ERRRCV: Received invalid packet: Bad Checksum
from  x.x.x.x, Serial0/0.1
Sep  4 12:40:33.028: %OSPF-4-ERRRCV: Received invalid packet: Bad Checksum
from  x.x.x.x, Serial0/0.1
Sep  4 13:54:29.354: %OSPF-4-ERRRCV: Received invalid packet: Bad Checksum
from  x.x.x.x, Serial0/0.1


hub-site#show ver | incl IOS
IOS (tm) 7200 Software (C7200-JK9S-M), Version 12.3(20), RELEASE SOFTWARE
(fc2)


regards,
/virendra
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