STP

[ccie_rooky]

I am getting this error frequently on a 6509 switch:

"

(enable) 2010 Mar 19 08:20:02 PDT -07:00 %ETHC-5-PORTFROMSTP:Port 9/42 left bridge port 9/42
2010 Mar 19 08:20:03 PDT -07:00 %DTP-5-AUXVLANPORTOFF:Auxiliary vlan removed on port 9/42
2010 Mar 19 08:20:55 PDT -07:00 %DTP-5-AUXVLANPORTON:Auxiliary vlan added on  port 9/42
2010 Mar 19 08:21:10 PDT -07:00 %ETHC-5-PORTTOSTP:Port 9/42 joined bridge port 9/42
2010 Mar 19 08:22:07 PDT -07:00 %ETHC-5-PORTFROMSTP:Port 9/42 left bridge port 9/42
2010 Mar 19 08:22:07 PDT -07:00 %DTP-5-AUXVLANPORTOFF:Auxiliary vlan removed on port 9/42
2010 Mar 19 08:22:15 PDT -07:00 %DTP-5-AUXVLANPORTON:Auxiliary vlan added on  port 9/42
2010 Mar 19 08:22:30 PDT -07:00 %ETHC-5-PORTTOSTP:Port 9/42 joined bridge port 9/42

(enable) 2010 Mar 19 08:30:54 PDT -07:00 %ETHC-5-PORTFROMSTP:Port 9/42 left bridge port 9/42

2010 Mar 19 08:30:54 PDT -07:00 %DTP-5-AUXVLANPORTOFF:Auxiliary vlan removed on port 9/42

2010 Mar 19 08:30:56 PDT -07:00 %DTP-5-AUXVLANPORTON:Auxiliary vlan added on  port 9/42

2010 Mar 19 08:31:11 PDT -07:00 %ETHC-5-PORTTOSTP:Port 9/42 joined bridge port 9/42"

The error is reccuring almost every 5 minites.

Any idea of what is causing it and how I should fixe it?

Thanks

[Giuseppe Larosa]

Hello,

the connection is not stable.

This kind of messages appear on CatOS when a port flaps the key are the messages like

joined bridge

left bridge

there are other messages because a Voice vlan (auxilairy vlan) is configured for the port.

What is connected on this port?

Hope to help

Giuseppe

[ccie_rooky]

Giuseppe:

The VoiP phone are connected to the ports and the PCs are trunked to the phones ports. So, yes, the auxilliary vlans are configured one these ports.

So what should I do? Reseat the modules?

Thanks.

[Ganesh Hariharan]

Giuseppe:
The VoiP phone
are connected to the ports and the PCs are trunked to the phones ports.
So, yes, the auxilliary vlans are configured one these ports.
So what should I do? Reseat the modules?
Thanks.

Hi,

The switch generates %ETHC-5-PORTTOSTP syslog message, whenever a link is detected on a switch port and the %ETHC-5-PORTFROMSTP syslog message can occur whenever a link is lost on a switch port.These syslogs are normal informational messages that indicate that a port was removed from or added to the spanning tree.

Note that channeling does not have to be enabled in order for these messages to be generated.

A high number of these messages is an indication that a port loses a link due to a mis-configuration or a connection issue.

Check out the below link for more information about the error message.

http://www.cisco-secure.com/en/US/docs/switches/lan/catalyst4000/8.3and8.4glx/system/message/emsg.html

Hope to Help !!

Ganesh.H