Cabletron Systems 9H42X-XX Changing Bridge Spanning Tree Parameters

Bridging

5-16 Bridge Spanning Tree

Designated Port

Displays the network address portion of the Port ID (which includes a

manageable Priority component) of the port believed to be the Designated Port

for the LAN associated with this port.

The Designated Port ID, along with the Designated Bridge and Port Identiﬁer

parameters for the port, is used to determine whether this port should be the

Designated Port for the LAN to which it is attached. Management also uses it to

determine the Bridged LAN topology.

Topology

This indicates how many times the bridge’s Topology Change ﬂag has been

changed since the 9H42x-xx module was last powered-up or initialized. The

Topology Change ﬂag increments each time a bridge enters or leaves the network,

or when the Root Bridge ID changes.

Changing Bridge Spanning Tree Parameters

The Bridge Spanning Tree window allows you to update the following

parameters for the 9H42x-xx module. When you have ﬁnished making changes to

the following individual parameters, you must click on at the bottom of

the Spanning Tree window to write the changes to the device.

Changing Bridge Priority

To change the part of the bridge address that contains the identiﬁer used in the

Spanning Tree Algorithm for priority comparisons:

1. Highlight the Bridge Priority ﬁeld.

2. Enter the new identiﬁer, in hexadecimal format; the allowed range is 0-FFFF

hexadecimal.

3. Click on .

The selected Bridge Priority will be applied to the bridge (a lower number

indicates a higher priority in the root selection process).

NOTE

Any values you set at the bridge will cause a Topology Change ﬂag to be issued in the next

Conﬁguration BPDUs it transmits. This will cause the bridged network to immediately

recalculate Spanning Tree and change topology accordingly.