Chapter 13 Spanning Tree Protocol

13.1.3 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 26 STP Port States

PORT

DESCRIPTION

STATE

 

Disabled

STP is disabled (default).

 

 

Blocking

Only configuration and management BPDUs are received and processed.

 

 

Listening

All BPDUs are received and processed.

 

Note: The listening state does not exist in RSTP.

 

 

Learning

All BPDUs are received and processed. Information frames are submitted

 

to the learning process but not forwarded.

 

 

Forwarding

All BPDUs are received and processed. All information frames are received

 

and forwarded.

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.

To set up MRSTP, activate MRSTP on the Switch and specify which port(s) belong to which spanning tree.

MGS3700-12C User’s Guide

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ZyXEL Communications metrogigabit switch manual STP Port States, Multiple Rstp, 149, Port Description State
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metrogigabit switch specifications

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