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490 CHAPTER 12: STP COMMANDS
Port Port number.
Only network ports are listed. STP does not apply to
3Com Wireless LAN Managed Access Point AP2750
ports or wired authentication ports.
Vlan VLAN ID.
STP-State
or
Port-State
STP state of the port:
Blocking—The port is not forwarding Layer 2 traffic
but is listening to and forwarding STP control
traffic.
Disabled—This state can indicate any of the
following conditions:
The port is inactive.
The port is disabled.
STP is enabled on the port but the port is not
forwarding traffic. (The port is active and
enabled but STP has just started to come up.)
Forwarding—The port is forwarding Layer 2 traffic.
Learning—The port is learning the locations of
other devices in the spanning tree before changing
state to forwarding.
Listening—The port is comparing its own STP
information with information in STP control
packets received by the port to compute the
spanning tree and change state to blocking or
forwarding.
STP Off—STP is disabled on the port.
Table 75 Output for display spantree (continued)
Field Description