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Cat 5500 loses connectivity on a Gigabit port at exactly 10 min intervals

Hi,

Please help me with the following:

A Catalyst 5500 loses connectivity on a Gigabit port at exactly 10 min intervals. This Catalyst has been up and working with the same config for 2 years. The port disconnect would cause a spanning tree change which affected users. The only other problem I had with this Catalyst was hardware related.

Here are the log entries:

2003 Feb 20 07:39:24 PST -08:00 %PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/2

2003 Feb 20 07:39:27 PST -08:00 %DTP-5-TRUNKPORTON:Port 3/2 has become isl trunk

2003 Feb 20 07:49:27 PST -08:00 %PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/2

2003 Feb 20 07:49:28 PST -08:00 %DTP-5-NONTRUNKPORTON:Port 3/2 has become non-trunk

2003 Feb 20 07:49:58 PST -08:00 %PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/2

2003 Feb 20 07:50:01 PST -08:00 %DTP-5-TRUNKPORTON:Port 3/2 has become isl trunk

2003 Feb 20 08:00:01 PST -08:00 %PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/2

2003 Feb 20 08:00:01 PST -08:00 %DTP-5-NONTRUNKPORTON:Port 3/2 has become non-trunk

2003 Feb 20 08:00:31 PST -08:00 %PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/2

2003 Feb 20 08:00:34 PST -08:00 %DTP-5-TRUNKPORTON:Port 3/2 has become isl trunk

2003 Feb 20 08:08:29 PST -08:00 %PAGP-5-PORTFROMSTP:Port 3/2 left bridge port 3/2

2003 Feb 20 08:08:29 PST -08:00 %DTP-5-NONTRUNKPORTON:Port 3/2 has become non-trunk

Thanks,

Bob

1 REPLY

Re: Cat 5500 loses connectivity on a Gigabit port at exactly 10

Looks like trunking is set to auto for this port. It is toggling between trunking and non-trunking.

Switch it to fixed ON or OFF depending on what you need.

Regards,

Leo

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