John,
This could be a very serious problem. It looks like you have a bridging
loop. Check both ends of the trunk to make sure everything is set the same:
duplex, speed, native vlan, FastetherChannel settings, trunk encapsulation,
VLANs allowed on the trunk, etc. This problem can grow to crash your whole
network.
Very important: do not reboot any of your switches until you have resolved
the conflict. A lot of Spanning Tree traffic is definitely to be avoided
until the problem is fixed.
Try this URL: http://www.cisco.com/warp/public/473/16.html
Dave Swink
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> john hudson
> Sent: Monday, January 15, 2001 4:56 AM
> To: [EMAIL PROTECTED]
> Subject: Port Flapping
>
>
> Guy`s i have a problem ......
>
> some of my trunk port`s keep reporting this message.....
>
> port 2/1 joined bridge port 2/1
> port 2/1 left bridge port 2/1
>
>
> any idea`s
>
>
> (i think it`s simple,but just don`t know)
>
> john
>
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