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Interoperability mstp/pvst

Could someone help me?

How to work a PVST vlan that is also belongs an MSTP instance, for example mst2? and How to work a MSTP instance that is also belong a PVST Vlan?

The root for the CIST is another root than the mst2.

Thanks,

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Last update:
‎09-20-2011 06:02 AM
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The MSTP bridge simply simulte all PVST+ BPDUs by replicating CIST BPDUs on the Boundary link between the PVST+ bridge and the MSTP domain on the Trunk link between them. The MSTP bridge recieves all PVST+ BPDUs and process them using Internal Spanning-tree the (IST). The MSTP bridge view like another PVST+ domain to the PVST+.

The Cisco's Implementation recommends to have always the root bridge for all VLANs to be the CIST root bridge inside the region.

Regards,

Mohamed