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 27 STP Port States
PORT | DESCRIPTION | |
STATE | ||
| ||
Disabled | STP is disabled (default). | |
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| |
Blocking | Only configuration and management BPDUs are received and processed. | |
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| |
Listening | All BPDUs are received and processed. |
| Note: The listening state does not exist in RSTP. |
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|
Learning | All BPDUs are received and processed. Information frames are submitted |
| to the learning process but not forwarded. |
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|
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.
Figure 56 MRSTP Network Example
To set up MRSTP, activate MRSTP on the Switch and specify which port(s) belong to which spanning tree.
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