
Spanning Tree Introduction: STP, RSTP, MSTP
©2008 Allied Telesis Inc. All rights reserved.
Software Version 5.2.1
AlliedWare Plus
TM
Operating System Software Reference C613-50003-00 REV E
18.5
Spanning Tree Protocol (STP)
STP uses the process described in
Table 18-1
to avoid loops.
STP port states
In STP mode, each switch port can be in one of five spanning tree states, and one of two switch
states. The state of a switch port is taken into account by STP. The STP port states (
Table 18-2
)
affect the behavior of ports whose switch state is enabled.
Table 18-2:
STP port states
State
Meaning
DISABLED
STP operations are disabled on the port. The port does not participate in
the operation of the Spanning Tree Algorithm and Protocol. The port can
still switch if its switch state is enabled.
BLOCKING
The forwarding process discards received frames and does not submit
forwarded frames for transmission. This is the “standby” mode.The port
does not participate in frame relay.
LISTENING
The port is enabled for receiving frames only. The port is preparing to
participate in frame relay. The forwarding process discards received
frames and does not submit forwarded frames for transmission.
LEARNING
The port is enabled for receiving frames only, and the Learning Process
can add new source address information to the Forwarding Database.
FORWARDING
The normal state for a switch port. The forwarding process and the
Spanning Tree entity are enabled for transmit and receive operations on
the port.
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