ZyXEL Communications metrogigabit switch manual 160, Make them

Chapter 13 Spanning Tree Protocol

Table 30 Advanced Application > Spanning Tree Protocol > MRSTP (continued)

LABEL	DESCRIPTION
Bridge Priority	Bridge priority is used in determining the root switch, root port and
	designated port. The switch with the highest priority (lowest numeric
	value) becomes the STP root switch. If all switches have the same
	priority, the switch with the lowest MAC address will then become the
	root switch. Select a value from the drop-down list box.
	The lower the numeric value you assign, the higher the priority for this
	bridge.
	Bridge Priority determines the root bridge, which in turn determines
	Hello Time, Max Age and Forwarding Delay.
Hello Time	This is the time interval in seconds between BPDU (Bridge Protocol Data
	Units) configuration message generations by the root switch. The
	allowed range is 1 to 10 seconds.
Max Age	This is the maximum time (in seconds) the Switch can wait without
	receiving a BPDU before attempting to reconfigure. All Switch ports
	(except for designated ports) should receive BPDUs at regular intervals.
	Any port that ages out STP information (provided in the last BPDU)
	becomes the designated port for the attached LAN. If it is a root port, a
	new root port is selected from among the Switch ports attached to the
	network. The allowed range is 6 to 40 seconds.
Forwarding	This is the maximum time (in seconds) the Switch will wait before
Delay	changing states. This delay is required because every switch must
	receive information about topology changes before it starts to forward
	frames. 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. The allowed range is 4 to 30
	seconds.
	As a general rule:

	Note: 2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1)
Port	This field displays the port number.
*	Settings in this row apply to all ports.
	Use this row only if you want to make some settings the same for all
	ports. Use this row first to set the common settings and then make
	adjustments on a port-by-port basis.

	Note: Changes in this row are copied to all the ports as soon as you
	make them.
Active	Select this check box to activate STP on this port.
Edge	Select this check box to configure a port as an edge port when it is
	directly attached to a computer. An edge port changes its initial STP
	port state from blocking state to forwarding state immediately without
	going through listening and learning states right after the port is
	configured as an edge port or when its link status changes.
	Note: An edge port becomes a non-edge port as soon as it receives
	a Bridge Protocol Data Unit (BPDU).

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MGS3700-12C User’s Guide