ZyXEL Communications GS2200 Series, User Manual

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Chapter 13 Spanning Tree Protocol
GS2200 Series User’s Guide
106
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.