Multiple Spanning Tree Protocol: Difference between revisions

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==== BPDUs ====
{{Main article|Bridge Protocol Data Unit}}
AMSTP BPDUs use the same local multicast protocol addresses than STP and have a structure that resembles MSTP BPDUs since both are comprised essentially of a basic BPDU and several AM-Records, allowing full-backwards compatibility with RSTP and STP standard protocols. Each of the AM-Records contains the data used to negotiate a specific tree instance (AMSTI). Every ABridge, except for the elected root bridge, creates an AM-Record for its own spanning tree instances. They are used by connected ports of neighboring switches to negotiate the transitions of each tree instance with a proposal/agreement mechanism.
 
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==See also==
* [[Bridge Protocol Data Unit]]
* [[Distributed minimum spanning tree]]
* [[EtherChannel]]