Intel ZT8101 Click Apply Following information is displayed about STP, Field Default Description

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.

Field	Default	Description
		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.
Max Age	20	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)]
		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
Hello Time	2	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.
		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
Forward Delay	15	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.

ZT8101 Users Guide 105