ZyXEL MES-3728 User Guide - Page 128
Multiple STP
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Chapter 13 Spanning Tree Protocol Note: Each port can belong to one STP tree only. Figure 64 MRSTP Network Example 13.1.5 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. 13.1.5.1 MSTP Network Example The following figure shows a network example where two VLANs are configured on the two switches. If the switches are using STP or RSTP, the link for VLAN 2 will be 128 MES-3728 User's Guide