Suddenly lost connections

[Gary Tong]

4 servers connected on Cat4506 left connection for unknown reason. However, the condition was resumed automatically after 2 seconds.

What is the possible reason?

2006 May 28 07:00:29 Bangkok +07:00 %ETHC-5-PORTFROMSTP:Port 3/43 left bridge port 3/43

2006 May 28 07:00:30 Bangkok +07:00 %ETHC-5-PORTFROMSTP:Port 4/26 left bridge port 4/26

2006 May 28 07:00:30 Bangkok +07:00 %ETHC-5-PORTFROMSTP:Port 5/26 left bridge port 5/26

2006 May 28 07:00:30 Bangkok +07:00 %ETHC-5-PORTFROMSTP:Port 3/45 left bridge port 3/45

2006 May 28 07:00:32 Bangkok +07:00 %ETHC-5-PORTTOSTP:Port 3/43 joined bridge port 3/43

2006 May 28 07:00:32 Bangkok +07:00 %ETHC-5-PORTTOSTP:Port 4/26 joined bridge port 4/26

2006 May 28 07:00:32 Bangkok +07:00 %ETHC-5-PORTTOSTP:Port 5/26 joined bridge port 5/26

2006 May 28 07:00:32 Bangkok +07:00 %ETHC-5-PORTTOSTP:Port 3/45 joined bridge port 3/45

[a-vazquez]

This message indicates that the physical port disconnected from the logical port. [dec]/[dec] is the module number/port number, and [dec]/[chars] is the module number/port range. No action is necessary. This message is provided for information only.

[Richard Burts]

Guixi

There probably was some spanning tree event where the ports became unavailable, and then when the next BPDUs were sent (the timer is 2 seconds) they were recognized and became available again.

HTH

Rick

[msrohman]

I agree with rburts.

I experienced that situation in the last year or so. A 3550 switch in the VTP domain caused this problem. The log would state 50 servers all losing their connection. After about 2 seconds they would reconnect to the switchport. We upgraded the IOS of the 3550 switch. This fixed the problem. I have forgotten with IOS version contained the bug.

-Mike

[Gary Tong]

Hi Rick,

Thank you for your information. Could you please tell me more details on this?