Allied Telesis AT-S63 - Manual (Page 193)

AT-S63 Web Browser User’s Guide for AT-9400 Stacks
Section IV: Spanning Tree Protocols 193
5. Configure the STP port parameters, described in Table 32, as needed.
6. After configuring the parameters, click the Apply button.
7. To configure the ports on another switch in the stack, repeat this
procedure starting with step 3.
8. To save your changes in the master configuration file, click the Save
Config button in the Configuration menu.
Table 32. STP Port Settings
Parameter Definition
Port Priority Specifies the port priority. This parameter
is used as a tie breaker when two or more
ports 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 33.
Port Cost Specifies the 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 65,535. The default setting is
Auto-detect, which sets port cost
depending on the speed of the port. If you
select Auto-Detect, the management
software assigns a value of 100 to a port
operating at 10 Mbps, 10 for 100 Mbps,
and 4 for one gigabit.
Table 33. Port Priority Value Increments
Increment
Bridge
Priority
Increment
Bridge
Priority
0 0 8 128
1 16 9 144
2 32 10 160
3 48 11 176
4 64 12 192
5 80 13 208
6 96 14 224
7 112 15 240