ZyXEL Communications SAM1316-22, User Manual

Page: 171 / 464

Chapter 23 Spanning Tree Protocol
SAM1316-22 User’s Guide
171
Time since
change This is the time since the spanning tree was last reconfigured.
Cost to root This is the path cost from the root port on this switch to the root
switch.
Root port ID This is the priority and number of the port on the switch through
which this switch must communicate with the root of the Spanning
Tree. “0x0000” displays when this device is the root switch.
Root max age
(second) This is the maximum time (in seconds) the root switch can wait
without receiving a configuration message before attempting to
reconfigure.
Root hello time
(second) This is the time interval (in seconds) at which the root switch
transmits a configuration message. The root bridge determines Hello
Time, Max Age and Forwarding Delay.
Root forward
delay (second) This is the time (in seconds) the root switch will wait before changing
states (that is, listening to learning to forwarding).
Max age (second) This is the maximum time (in seconds) the SAM1316-22 can wait
without receiving a configuration message before attempting to
reconfigure.
Hello time
(second) This is the time interval (in seconds) at which the SAM1316-22
transmits a configuration message. The root bridge determines Hello
Time, Max Age and Forwarding Delay.
Forward delay
(second) This is the time (in seconds) the SAM1316-22 will wait before
changing states (that is, listening to learning to forwarding).
Port Status This identifies the SAM1316-22’s ports that support the use of STP. If
STP is activated, the following fields appear. If STP is not activated,
Disabled appears.
State This field displays the port’s RSTP (or STP) state. With RSTP, the state
can be discarding, learning or forwarding. With STP, the state can
be disabled, blocking, listening, learning, or forwarding.
Disabled appears when RSTP has not been turned on for the
individual port or the whole device.
Port ID This is the priority and number of the port on the switch through
which this switch must communicate with the root of the Spanning
Tree. “0x0000” displays when this device is the root switch.
Path cost This is the path cost from this port to the root switch.
Cost to root This is the path cost from the root port on this switch to the root
switch.
Designated bridge This is the unique identifier for the bridge that has the lowest path
cost to reach the root bridge, consisting of bridge priority plus MAC
address.
Designated port This is the port on the designated bridge that has the lowest path cost
to reach the root bridge, consisting of bridge priority.
Poll Interval(s)
Set Interval
The text box displays how often (in seconds) this screen refreshes.
You may change the refresh interval by typing a new number in the
text box and then clicking Set Interval.
Stop Click Stop to halt STP statistic polling.
Table 51 Spanning Tree Protocol Status (continued)
LABEL DESCRIPTION