Allied Telesis AT-S87 - Manual (Page 102)

Chapter 10: STP and RSTP
102
Enabling or Disabling Spanning Tree
The AT-S87 management software supports STP and RSTP. However,
only one spanning tree protocol can be active on the switch at a time.
To select and activate a spanning tree protocol, or to disable spanning
tree, perform the following procedure:
1. From the main menu, select Bridge > Spanning Tree.
The Spanning Tree page is shown in Figure 33.
Figure 33. Spanning Tree Page
The top portion of the page displays the following information:
Root Port
The root port of the root bridge.
Root Port Path Cost
The spanning tree algorithm uses the cost parameter to decide which
port provides the lowest cost path to the root bridge for that LAN. The
range is 0 to 61,440. The default setting is Automatic Update, which
sets port cost depending on the speed of the port. The Auto default
values are shown in Table 5 on page 96.