Dell PowerConnect B-RX Configuration Manual page 1106

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802.1s Multiple Spanning Tree Protocol

The following definitions describe the STP instances that define an MSTP configuration.

MSTP configured network

Common Spanning (CST) – MSTP runs a single instance of spanning tree, called the Common

Spanning Tree (CST), across all the bridges in a network. This instance treats each region as a

single bridge. It all other ways, it operates exactly like Rapid Spanning Tree (RSTP).

Internal Spanning Tree (IST) – Instances of spanning tree that operate within a defined region

are called ISTs (Internal Spanning Tree).

Common and Internal Spanning Trees (CIST) – This is the default MSTP instance 0. It contains

all of the ISTs and all bridges that are not formally configured into a region. This instance

interoperates with bridges running legacy STP and RSTP implementations.

Multiple Spanning Tree Instance (MSTI) – The MSTI is identified by an MST identifier (MSTid)

value between 1 and 4090; however, VLAN 4090 is a reserved VLAN.

MSTI defines an individual instance of an IST. One or more VLANs can be assigned to an MSTI.

A VLAN cannot be assigned to multiple MSTIs.

MSTP Region – These are clusters of bridges that run multiple instances of the MSTP protocol.

Multiple bridges detect that they are in the same region by exchanging their configuration

(instance to VLAN mapping), name, and revision-level. Therefore, if you need to have two

bridges in the same region, the two bridges must have identical configurations, names, and

revision-levels.

BigIron RX Series Configuration Guide

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