MST and PVST

Hi all,

I have read below statement about when connecting MST and PVST+ switches
together.Can someone make it more clear for me?I do not understand why is
that.

When a designated port on an MST switch is connected to a Per VLAN Spanning
Tree Plus (PVST+) switch, the Common and Internal Spanning Tree (CIST)
(MST00) information on the port of the MST switch must be consistently
superior (lower bridge ID, lower path cost, and so forth) to the information
in all the PVST+ messages.
If the port is the root, the CIST (MST00) information on the MST switch must
be consistently inferior to all the PVST+ messages

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Received on Thu Jun 24 2010 - 09:31:24 ART