Allied Telesis AT-S62 - Manual (Page 281)

AT-S62 Management Software Web Browser Interface User’s Guide
Section IV: Spanning Tree Protocols 281
MaxAge must be less than (2 x (ForwardingDelay - 1))
6 - Bridge Identifier
The MAC address of the bridge. The bridge identifier is used as a tie
breaker in the selection of the root bridge when two or more bridges
have the same bridge priority value. This value cannot be changed.
3. When you are finished configuring the parameters, click Apply.
4. To adjust RSTP port settings, click on the port in the switch image and
click Modify. You can select more than one port at a time.
The RSTP Port Settings window is shown in Figure 95.
Figure 95. RSTP Port Settings Window
5. Adjust the settings as desired. The parameters are described below.
1 - Port Priority
This parameter is used as a tie breaker when two or more ports are
determined to have equal costs to the root bridge. The range is 0 to
240 in increments of 16. The default value is 8 (priority value 128). For
a list of the increments, refer to Table 8, “Port Priority Value
Increments” on page 277.
2 - Port 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 20,000,000. The default setting is Automatic detect, which
sets port cost depending on the speed of the port. Table 11 lists the
RSTP port costs with Auto-Detect when the port is not part of a port
trunk.
Table 11. RSTP Auto-Detect Port Costs
Port Speed Port Cost
10 Mbps 2,000,000