Intel ZT 8101 10/100 user manual To define the port members of an STP group, Using the Web Console

		Using the Web Console
Field	Default	Description
		Specifies the maximum time (in seconds) the root device will
		wait before changing states (for example, from listening to
		blocking or from blocking to forwarding). This delay is
		required because every device must receive information
Forward Delay	15	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 is used in selecting the root bridge, root port, and
		designated port. The device with the highest priority becomes
Priority	32768	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.

5. Click Apply.

The following information is displayed about STP.

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.

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.In the left panel, click Spanning Tree.

2.In the top panel, click STP Port Settings.

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