STP issue

Hi,
I have 3 switches connected in a full mesh at a Customers site.

One Cisco 6500 switch and 2 NON CISCO switches.The NON CISCO switches have
each 4 physical connections with the 6500 and 2 between each others. the issue
is the following:

The NON CISCO switches are support to form an etherchannel with the 6500, but
they neither support LACP nor PAGP. Thus the only left etherchannel method is
on. On the catalyst 6500 the configuration for the etherchannel is correct.

The Loop occurs when my customer misconfigures the etherchannel from the NON
CISCO side.
We end up having etherchannel config from one end (6500) and normal links from
the NON CISCO switches side. Since the etherchannel port will have the same
parameters, all the NON CISCO ports will end up forwarding and an STP loop is
formed causing the network goes down.

Now etherchannel guard is enabled but its not putting the ports into error
disable mode on the 6500.
Is there any way in case the customer misconfigures the NON CISCO switches to
prevent a loop ?

Thx,
Hadi
                                                
Received on Wed Oct 14 2009 - 20:20:52 ART