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ZT8101 User’s Guide 65
Using the Telnet Console
4. Highlight APPLY and press Enter.
The following information is displayed about STP.
To define the port members of an STP group
The switch allows you to configure Spanning Tree Groups that consist of a group of ports that will
be handled as though they were a single spanning tree device. An STP group uses the switch-level
parameters entered above, with the addition of port priority and port cost.
An STP group spanning tree works in the same way as the switch-level spanning tree, but the root
bridge concept is replaced with a root port concept. A root port is a port of the group that is elected
(on the basis of port priority and port cost) to be the connection to the network for the group.
Redundant links will be blocked, just as redundant links are blocked on the switch level.
An STP port group should correspond to a VLAN group of ports.
1. From the Main Menu, select Spanning Tree | Port Settings and press Enter.
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 to 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.
Field Default Description