Multiple Spanning Tree Protocol: Difference between revisions

Revision as of 17:23, 6 December 2016

Revision as of 17:27, 6 December 2016

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==== Architecture ====

[[File:Architecture ABridges.png|thumb|Two-layer network proposal for ABridges.]]

With the objective of enhancing the properties of Abridges protocol, a two-level hierarchical [[Link layer|link layer]] infrastructure in which segmentation insis performed at [[Link layer|link layer]] is proposed. The core will be composed, primarily, by Abridges (Bridges using an implementation of AMSTP) and will oversee connecting the leaf access networks that are referred to as “access layer”. Besides, each of this access networks, also called islands, will be a layer-two sub-network using [[Spanning_Tree_Protocol|STP]] connected to one or more Abridges.

==== Protocol Operation ====

Inside every island or access network a bridge is automatically elected to behave as the Root Bridge, this one bridge will behave as a gateway, allowing the forwarding of frames from the core to an island and conversely. Just one Abridge is going to perform these gateway functions, although many could be connected. Communication among [[IEEE 802.1D|802.1D]] bridges and between standard [[IEEE 802.1D|802.1D]] bridges and ABridges does not require point-to-point connections.<br />