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ZT8101 Users Guide 105
Using the Web Console
4. Configure the following fields. The factory default settings should cover the majority of
installations, and most installations should keep these default settings.
5. Click Apply.
The following information is displayed about STP.
Field Default Description
Max Age 20
Specifies the maximum time (in seconds) the switch will wait
for a configuration message from the root bridge. At the end
of this time, the switch will start sending out its own
configuration messages for permission to become the root
bridge.
The device with the lowest bridge identifier becomes the root
bridge (see the Priority field).
Max Age must be set within the following range:
• The minimum value is the higher of 6 or [2 x (Hello Time
+1)]
• The maximum value is the lower of 40 or [2 x (Forward
Delay -1)]
Hello Time 2
Specifies the time interval (in seconds) between two
configuration messages. The root bridge sends these
messages at this interval to inform all other devices that it is
the root bridge. This time will be used if and when your switch
becomes the root bridge.
It can be set from 1—10 seconds.
The Hello Time cannot be longer than the Max Age;
otherwise, a configuration error occurs.
Forward Delay 15
Specifies the maximum time (in seconds) the root device will
wait before changing states (for example, from listening to
blocking, from blocking to forwarding). This delay is required
because every device must receive information about
topology changes before it starts to forward packets. In
addition, each port needs time to listen for conflicting
information that would make it return to a blocking state;
otherwise, temporary data loops might result.
• Maximum value is 30
• Minimum value is the higher of 4 or [(Max. Age / 2) +1]
Priority 32768
Priority is used in selecting the root bridge, root port, and
designated port. The device with the highest priority becomes
the STP root bridge. The lower the numeric value, the higher
the priority. If all devices have the same priority, the device
with the lowest MAC address will become the root bridge.
Range: 0—65535.
Field Description
Designated Root Bridge The IP address of the current root bridge for the STP group.
Root Priority The current value of the bridge priority for the group.
Cost to Root
The currently-assigned cost for the route from the designated STP-group
port to the root bridge.
Root Port The port number of the root port.
Last Topology Change
The time (in seconds) since the last change in the root bridge or designated
STP-group port.
Topology Change Count The number of topology changes since the switch was last restarted.