Stp Port States; Multiple Rstp - ZyXEL Communications MGS-3712/MES-3728 User Manual

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 25 STP Port States
PORT
STATE
Disabled
Blocking
Listening
Learning
Forwarding

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.
MES-3728 User's Guide
DESCRIPTION
STP is disabled (default).
Only configuration and management BPDUs are received and processed.
All BPDUs are received and processed.
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.
Chapter 13 Spanning Tree Protocol
127