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Forum Replies

  1. Hello Stefano.

    PVST+ as its name suggests creates an spanning tree instance for EACH VLAN. MST on the other hand can have many VLANs participate in a single spanning tree instance thus reducing the number of spanning tree instances and thus consuming fewer system resources (CPU, Memory etc).

    I hope this has been helpful!

    Laz

  2. Hello Ehsan

    Essentially, PVRST uses multiple instances of IEEE 802.1w. Most non-cisco devices that support RSTP will support one instance of PVRST. In most cases, because PVRST is backward compatible with RSTP, the PVRST implementation will revert to RSTP. So you are essentially correct in your descsription.

    I hope this has been helpful!

    Laz

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