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Chapter 11 Spanning Tree Protocol
GS-3012/GS-3012F User’s Guide
105
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.
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.
Note: Each port can belong to one STP tree only.
Figure 49 MRSTP Network Example
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 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.