ZyXEL Communications ES-100, User Manual

Page: 93 / 232

Chapter 11 Bridge
MES-2110 User’s Guide
93
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.