Help understanding MST

From: kwasi-ccie@comcast.net
Date: Fri Apr 29 2005 - 11:40:15 GMT-3


Hi:

I am trying to understand how MST works. One aspect that I am not clear on is the fact that for any switch to be part of an MST Region it must have the same VLAN-to-Instance mapping, beside the same MST name and version #.

Does this mean all VLANs on a switch in an MST region can be mapped to only one MST instance? For instance can I have VLAN 10 and VLAN 20 (on an MST switch in an MST region) mapped to say instance s 1 and 2, respectively? Or do they have to be mapped to only one instance such as instance 1?

If I can only map multiple VLANs to only one instance, then what is the need for having instances 1 - 15 for internal MST switches?

I have read CCO but the examples are not clear enough for me on this issue.

Your comments are welcome.
Thanks.



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