ZyXEL ES3500-24HP User Guide - Page 126

Multiple RSTP, Multiple STP

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Chapter 13 Spanning Tree Protocol 13.1.4 Multiple RSTP MRSTP (Multiple RSTP) is ZyXEL's proprietary feature that is compatible with RSTP and STP. With MRSTP, you can have more than one spanning tree on your Switch and assign port(s) to each tree. Each spanning tree operates independently with its own bridge information. In the following example, there are two RSTP instances (MRSTP 1 and MRSTP2) on switch A. Figure 57 MRSTP Network Example 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. 13.1.5 Multiple STP Multiple Spanning Tree Protocol (IEEE 802.1s) is backwards 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. 126 ES3500 Series User's Guide

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Chapter 13 Spanning Tree Protocol
ES3500 Series User’s Guide
126
13.1.4
Multiple RSTP
MRSTP (Multiple RSTP) is ZyXEL’s proprietary feature that is compatible with RSTP and STP. With
MRSTP, you can have more than one spanning tree on your Switch and assign port(s) to each tree.
Each spanning tree operates independently with its own bridge information.
In the following example, there are two RSTP instances (
MRSTP 1
and
MRSTP2
) on switch
A
.
Figure 57
MRSTP Network Example
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.
13.1.5
Multiple STP
Multiple Spanning Tree Protocol (IEEE 802.1s) is backwards 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.