Westermo MR Series - Manual (Page 243)

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Web Interface and Command Line Reference Guide www.westermo.com
The port roles are:
Disabled: There is nothing physically connected to this ethernet port.
Root: A forwarding port that has been elected for the spanning-tree topology, towards the root
bridge.
Designated: A forwarding port for every LAN segment, away from the root bridge.
Alternate: An alternate path to the root bridge. This path is different than using the root port.
Backup: A backup/redundant path to a segment where another bridge port already connects.
The STP port states are:
Disabled: The port is not functioning and cant send or receive data.
Listening: The port is sending and receiving BPDU’s and participates in the election process of the
root bridge. Ethernet frames are discarded.
Learning: The port does not yet forward frames but it does learn source addresses from frames
received and adds them to the MAC address table.
Forwarding: The port receiving and sending data, normal operation. STP still monitors incoming
BPDU’s that would indicate it should return to the blocking state to prevent a loop.
Blocking: A port that would cause a switching loop, no user data is sent or received but it may go
into forwarding mode if the other links in use were to fail and the spanning tree algorithm deter-
mines the port may transition to the forwarding state. BPDU data is still received in blocking state.
The RSTP port states are:
Learning: The port does not yet forward frames but it does learn source addresses from frames
received and adds them to the MAC address table. The port processes BPDU’s.
Forwarding: The port receiving and sending data, normal operation. STP still monitors incoming
BPDU’s that would indicate it should return to the blocking state to prevent a loop.
Discarding: A port that would cause a switching loop, no user data is sent or received but it may go
into forwarding mode if the other links in use were to fail and the spanning tree algorithm deter-
mines the port may transition to the forwarding state. BPDU data is still received in blocking state.