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Chapter 22 Spanning Tree Protocol
IES-612-51A User’s Guide
179
Figure 84 Spanning Tree Protocol
The following table describes the labels in this screen.
Table 51 Spanning Tree Protocol
LABEL DESCRIPTION
STP Status Click STP Status to display the IES-612-51A’s STP status (see Section 22.2 on
page 177).
Active Select this check box to turn on RSTP.
Note: It is recommended that you only use STP when you use the
IES-612-51A in standalone mode with a network topology
that has loops.
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. The allowed range is 0 to
61440.
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) a 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.