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Chapter 13 Spanning Tree Protocol

GS2200-8/24 User’s Guide

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Multiple STP

Multiple Spanning Tree Protocol (IEEE 802.1s) is backward compatible with STP/RSTP and

addresses the limitations of existing spanning tree protocols (STP and RSTP) in networks to include

the following features:

• One Common and Internal Spanning Tree (CIST) that represents the entire network’s

connectivity.

• Grouping of multiple bridges (or switching devices) into regions that appear as one single bridge

on the network.

• A VLAN can be mapped to a specific Multiple Spanning Tree Instance (MSTI). MSTI allows

multiple VLANs to use the same spanning tree.

• Load-balancing is possible as traffic from different VLANs can use distinct paths in a region.

13.2 Spanning Tree Protocol Status Screen

The Spanning Tree Protocol status screen changes depending on what standard you choose to

implement on your network. Click Advanced Application > Spanning Tree Protocol to see the

screen as shown.

Figure 69 Advanced Application > Spanning Tree Protocol

This screen differs depending on which STP mode (RSTP, MRSTP or MSTP) you configure on the

Switch. This screen is described in detail in the section that follows the configuration section for

each STP mode. Click Configuration to activate one of the STP standards on the Switch.