ZyXEL ES-3124PWR User Guide - Page 103

Chapter 11 Spanning Tree Protocol 11.1.3 STP Port States STP assigns five port states to eliminate packet looping. A bridge port is not allowed to go directly from blocking state to forwarding state so as to eliminate transient loops. Table 25 STP Port States PORT STATE DESCRIPTION Disabled STP is disabled (default). Blocking Only configuration and management BPDUs are received and processed. Listening All BPDUs are received and processed. Learning Forwarding Note: The listening state does not exist in RSTP. All BPDUs are received and processed. Information frames are submitted to the learning process but not forwarded. All BPDUs are received and processed. All information frames are received and forwarded. 11.1.4 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. To set up MRSTP, activate MRSTP on the Switch and specify which port(s) belong to which spanning tree. " Each port can belong to one STP tree only. Figure 50 MRSTP Network Example ES-3124 Series User's Guide 103