3com TR User Manual

C

HAPTER

 4: C

ONFIGURING

 

WITH

 

THE

 VT100 I

NTERFACE

Set the Spanning Tree and Source Routing fields for 
the Port using the Bridge selection, located at the 
bottom of the Port Setup screen. Choices are:

■

Priority

■

Path Cost

■

Attached LAN ID

■

Max. Route-Desc

■

STE Mode

From the Port Setup screen, perform these steps.

Select *Bridge* from the lower portion of the Port 
Setup screen.

The Switch 2000 TR Port Bridge Setup screen 
appears. See Figure 4-8.

Figure 4-8   Switch 2000 TR Port Bridge Setup Screen

Set Spanning Tree parameters as follows:

■

Priority—Port priority determines the choice of 
port when the Switch 2000 TR has two ports con-
nected to the same LAN, creating a loop. 

The port with the lowest value has the highest pri-
ority and is deleted by Spanning Tree first.

■

Path Cost—Path cost determines the amount of 
overhead required to forward packets to the root 
through this port.

The higher the path cost, the less likely Spanning 
Tree will use a port for forwarding. The lower the 
cost, the more likely Spanning Tree will use a port 
for routing.

Set the Source Routing parameters by toggling the 
[Space Bar] as follows:

■

Attached LAN ID—A unique number that identi-
fies the segment to which port is connected. This 
value can be set between 0 and FFF (0-4095). A 
value of FFFF (65535) indicates that no segment 
number has been assigned to this port.

■

Max. Route-Desc—This value describes the 
number of routing descriptions allowed in All 
Route Explorer (ARE) or Spanning Tree Explorer 
(STE) frames. This is also referred to as “hop 
count” limit since it limits the number of rings a 
packet can traverse.

■

STE Mode—This value determines how this port 
responds when presented with Spanning Tree 
Explorer (STE) packets. Set fields accordingly by 
toggling the [Space Bar].

■

Disabled—Indicates that the port will not 
accept or propagate STE packets and any pack-
ets received will be discarded.