ZyXEL Communications MES-2110 manual Root Bridge Information, List box, For this bridge

Chapter 11 Bridge

The following table describes the labels in this screen.

Table 26 Configuration > Bridge Menu > RSTP System Config

LABEL	DESCRIPTION
Root Bridge Information
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.
MAC Address	This is the root bridge’s MAC address.
Root Path Cost	Path cost is the cost of transmitting a frame on to a LAN through
	that port. It is recommended to assign this value according to the
	speed of the bridge. The slower the media, the higher the cost-
	see Table 23 on page 89 for more information.
Root Port	This shows whether the MES-2110 connects to another root
	switch (through port number 1-10) or serves as a root switch
	(Root).
Hello Time (sec)	This is the time interval (in seconds) at which the root switch
	transmits a configuration message. The root bridge determines
	Hello Time, Max Age and Forwarding Delay.
Forward Delay (sec)	This is the time (in seconds) the root switch will wait before
	changing states (that is, listening to learning to forwarding).

	Note: The listening state does not exist in RSTP.
Max age (sec)	This is the maximum time (in seconds) the MES-2110 can wait
	without receiving a configuration message before attempting to
	reconfigure.
Configuration Spanning Tree Parameters
RSTP Force Version	Use this to force the spanning tree algorithm to run on either the
	STP or RSTP protocol.
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 (sec)	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.

MES-2110 User’s Guide

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