ZyXEL Communications IES-2000, User Manual

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IES-2000/3000 User’s Guide
28-18 Switch-Related Commands
Table 28-8 Menu 24.1.2 - Spanning Tree Protocol Status
FIELD DESCRIPTION
BridgeID This is a unique identifier for this device, consisting of bridge priority plus MAC
address.
BMaxAge This is the maximum time (in 256
th
s of a second) a device can wait without receiving
a configuration message before attempting to reconfigure.
BHelloTime This is the time interval (in 256
th
s of a second) at which the root device transmits a
configuration message.
BForwardDelay This is the time (in 256
th
s of a second) a device will wait before changing states.
TopologyChangeDetect
ed
“1” shows that the device detected a topology change or received a message with a
change (“0” means no change was detected). A change triggers devices that are not
the root to send topology change notifications towards the root. A change causes the
root to set a topology change flag in the configuration messages that it sends for a
period of time.
TopologyChange This tells whether (1) or not (0) the most recently received configuration message
indicates a change in the active topology, when this device is not the root. For the
root, this tells whether (1) or not (0) a topology change was detected during the
previous topology change time.
TopologyChangeTime This is the time period (in 256
th
s of a second) after the root switch detects a change of
topology, during which it sends out configuration messages indicating the topology
change.
HoldTime This is the minimum time period (in 256
th
s of a second) that must elapse between the
sending of configuration BPDUs (Bridge Protocol Data Units). Only one configuration
BPDU may be sent during this time period.
Port_0 Info
Port ID: This is a unique identifier for this port among this device’s ports. The port ID consists
of a small integer (from one up) and the port’s priority.
Port State This is the current state of the port (0: disabled, 1: blocking, 2: listening, 3: learning, 4:
forwarding).
Enable This shows whether the port is activated (1) or not (0).
PathCost This is the cost for a packet to travel from this port to the root in the current Spanning
Tree configuration. The slower the media, the higher the cost. This is 0 for the root.
Designated Root This is the unique identifier for the device that the designated bridge records as the
root in the root identifier parameter of configuration BPDUs that it sends out.
Designated Cost For a designated port, this is the path cost to the LAN to which this port is attached.
Otherwise, it is the cost of the path to the root through the designated port on the LAN
to which this port is connected.
Designated Bridge For a designated port, this is the unique identifier for the device to which this port
belongs. Otherwise, it is the unique identifier for what is believed to be the designated
bridge for the LAN to which this port is connected.
Designated Port This is the port identifier of the port on the designated bridge, through which the
designated bridge sends configuration message information from this port (see Port
ID).
TopologyChangeAcknow
ledge
This shows whether (1) or not (0) a topology change acknowledgement flag is set in
reply to a received topology change notification BPDU.