Chapter 22 Spanning Tree Protocol

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.

 

179

IES-612-51A User’s Guide