Allied Telesis AT-S62 - Manual (Page 270)

Chapter 20: RSTP Commands
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Table 10 lists the RSTP port costs with
Auto-Detect when the port is part of a
port trunk.
portpriority Specifies the port’s 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. There are sixteen increments.
You specify the increment that corresponds to the
desired value. The default is 128, which is increment 8.
edgeport Defines whether the port is functioning as an edge
port. An edge port is connected to a device
operating at half-duplex mode and is not
connected to any device running STP or RSTP.
Options are:
yes, on, true The port is an edge port. The
values are equivalent. This is the
default.
Table 10 RSTP Auto-Detect Port Trunk Costs
Port Speed Port Cost
10 Mbps 20,000
100 Mbps 20,000
1000 Mbps 2,000
Table 11 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