page_title: Multiple Spanning Tree Protocol
section_title: Architecture
hierarchical_section_title: Multiple Spanning Tree Protocol / Extensions / ABRIDGES / Architecture
caption_attribution_description: English: Two-layer network proposal for ABridges.
context_page_description: The Multiple Spanning Tree Protocol and algorithm, provides both simple and full connectivity assigned to any given Virtual LAN throughout a Bridged Local Area Network. MSTP uses BPDUs to exchange information between spanning-tree compatible devices, to prevent loops in each MSTI and in the CIST, by selecting active and blocked paths. This is done as well as in STP without the need of manually enabling backup links and getting rid of bridge loops danger.
  Moreover, MSTP allows frames/packets assigned to different VLANs to follow separate paths, each based on an independent MSTI, within MST Regions composed of LANs and or MST Bridges. These Regions and the other Bridges and LANs are connected into a single Common Spanning Tree.
context_section_description: With the objective of enhancing the properties of Abridges protocol, a two-level hierarchical link layer infrastructure in which segmentation is performed at 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 STP connected to one or more Abridges.
caption: Two-layer network proposal for ABridges.
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