Cabletron Systems 7C04 사용자 설명서

The Spanning Tree Port Parameters Window

6-25

Using the 7C0x SmartSwitch Bridge View

The Spanning Tree Algorithm ensures that only a single bridge path exists 
between any two end stations in a network designed with multiple bridges 
placed in parallel; it also ensures that on any given bridge, only one port path 
exists between the bridge and any one network segment. In the Spanning Tree 
Port Table you can view and edit the Spanning Tree values for individual ports; 
the Spanning Tree Port parameters affect a port’s participation in the Spanning 
Tree.

To open the Spanning Tree Port Table window:

1.

Display the Device menu by clicking on the Front Panel 

 button.

2.

Drag down to Spanning Tree to open the Spanning Tree Protocol window.

3.

In the Spanning Tree Protocol window, click on the Spanning Tree  Port Table 
button.

1.

In the Bridge Traffic View, click mouse button 3 on a port to display the Port 
menu and drag down to Spanning Tree.

The scroll list at the top of the window lists each bridge port available on the 
device and its current port priority. Below the Port List, the window includes the 
following:

If two or more ports on the same bridge are connected to the same network 
segment, each port will receive the same device-level values for Root ID, Root 
Cost, and Bridge ID in Configuration BPDUs. In this case, the BPDU’s port-level 
information—the transmitting port’s identifier and its manageable Priority 
component— is used to determine which port on this bridge will be the 
Designated Port for that segment. A lower number indicates a higher priority; the 
default is 80. The allowable range is 0 to FF. 

The portion of the total path cost associated with this port. Lowering a port’s Path 
Cost makes a port more competitive in the selection of the Designated Port. The 
default value is 100 for Cabletron bridges. The allowable range is from 1 to 65535.