ZyXEL Communications GS2200-24P Series, User Manual, Page: 126 / 360

Chapter 13 Spanning Tree Protocol
GS2200-24/24P User’s Guide
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In the following example, there are two RSTP instances (MRSTP 1 and MRSTP2)
on switch A.
To set up MRSTP, activate MRSTP on the Switch and specify which port(s) belong
to which spanning tree.
Note: Each port can belong to one STP tree only.
Figure 66 MRSTP Network Example
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.