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Chapter 13 Spanning Tree Protocol

GS2200-24 User’s Guide

133

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
Delay

This is the maximum time (in seconds) the Switch will wait before
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.

Priority

Configure the priority for each port here.

Priority decides which port should be disabled when more than one port
forms a loop in a switch. Ports with a higher priority numeric value are
disabled first. The allowed range is between 0 and 255 and the default
value is 128.

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 27 on

page 124

for more information.

Table 32

Advanced Application > Spanning Tree Protocol > MRSTP (continued)

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