what is mstp

what is mstp? can it be use as VPN protocol.
what is the difference between mstp and mpls.
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Vikas BhatExperienced IT Infrastructure Services/operations ManagerCommented:
MSTP is IEEE defined network protocol that provides loop free topology (more recent and advanced version of spanning-tree protocol).
Can't be used for anything else except providing loop free topology.
Similarity between MSTP and MPLS ends with having letters M S P in their names (that is similarity and the rest is different).
tankergoblinAuthor Commented:
what is loop free topology, what is it use for
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Loop free topology - means that you do not have layer 2 network loops in your network.

Try to go through animation it is nice explanation of what is purpose of STP - http://www.cisco.com/image/gif/paws/10556/spanning_tree1.swf

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tankergoblinAuthor Commented:
may i know mstp at which layer?
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