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Cat 4006 ports leaving /joining

Hi,

I'm experiencing this problem in my 4006 Switch. This has a only one Uplink to 3750 L3 Switch. What happens , in normal case , I'm getting this error eventhough hosts (PC's )connected with these ports are ON only (no reboot). In normal case, ports are leaving /joining which makes me feeling something to do STP.

Regards,

Raju

2005 Dec 01 04:02:21 %PAGP-5-PORTFROMSTP:Port 4/28 left bridge port 4/28

2005 Dec 01 04:01:27 %PAGP-5-PORTTOSTP:Port 3/47 joined bridge port 3/47

2005 Dec 01 04:01:06 %PAGP-5-PORTFROMSTP:Port 3/47 left bridge port 3/47

2005 Dec 01 04:00:51 %PAGP-5-PORTTOSTP:Port 4/47 joined bridge port 4/47

2005 Dec 01 04:00:24 %PAGP-5-PORTFROMSTP:Port 4/47 left bridge port 4/47

2005 Dec 01 03:59:59 %PAGP-5-PORTTOSTP:Port 3/14 joined bridge port 3/14

2005 Dec 01 03:59:44 %PAGP-5-PORTTOSTP:Port 3/47 joined bridge port 3/47

2005 Dec 01 03:59:39 %PAGP-5-PORTFROMSTP:Port 3/14 left bridge port 3/14

2005 Dec 01 03:59:25 %PAGP-5-PORTFROMSTP:Port 3/47 left bridge port 3/47

2005 Dec 01 03:59:02 %PAGP-5-PORTTOSTP:Port 3/14 joined bridge port 3/14

2005 Dec 01 03:58:58 %PAGP-5-PORTTOSTP:Port 4/47 joined bridge port 4/47

2005 Dec 01 03:58:42 %PAGP-5-PORTFROMSTP:Port 3/14 left bridge port 3/14

2005 Dec 01 03:58:37 %PAGP-5-PORTFROMSTP:Port 4/47 left bridge port 4/47

2005 Dec 01 03:57:42 %PAGP-5-PORTTOSTP:Port 3/47 joined bridge port 3/47

2005 Dec 01 03:57:22 %PAGP-5-PORTFROMSTP:Port 3/47 left bridge port 3/47

2005 Dec 01 03:57:12 %PAGP-5-PORTTOSTP:Port 4/47 joined bridge port 4/47

2005 Dec 01 03:57:07 %PAGP-5-PORTTOSTP:Port 5/20 joined bridge port 5/20

2005 Dec 01 03:56:59 %PAGP-5-PORTTOSTP:Port 3/14 joined bridge port 3/14

2005 Dec 01 03:56:51 %PAGP-5-PORTFROMSTP:Port 4/47 left bridge port 4/47

2005 Dec 01 03:56:49 %PAGP-5-PORTFROMSTP:Port 5/20 left bridge port 5/20

2005 Dec 01 03:56:40 %PAGP-5-PORTFROMSTP:Port 3/14 left bridge port 3/14

2 REPLIES
VIP Purple

Re: Cat 4006 ports leaving /joining

Hello Raju,

basically, the message means that your ports are flapping, which could be caused by speed/duplex mismatches. Can you verify that both the switch and the user PC have the same settings (either auto or fixed duplex/speed setting)?

Also, make sure you have 'spanning-tree portfast' configured on your user ports...

HTH,

GP

Cisco Employee

Re: Cat 4006 ports leaving /joining

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