Allied Telesis AT-S62 - Manual (Page 266)

Chapter 20: STP, RSTP, and MSTP
Section IV: Spanning Tree Protocols 266
Table 11 lists the MSTP port costs with Auto Update when the port
is part of a port trunk.
This is also an MSTI-specific parameter. Like the priority
parameter, you can, using the MSTI List, assign a different internal
path cost for each MSTI where the port is a member.
Edge Port
This parameter defines whether the port is functioning as an edge
port. For an explanation of this parameter, refer to the AT-S62
Menus Interface User’s Guide.
Point-to-Point
This parameter defines whether the port is functioning as a point-
to-point port. For an explanation of this parameter, refer to the
AT-S62 Menus Interface User’s Guide.
Port External Path Cost
The port cost of the port if the port is connected to a bridge which
is a member of another MSTP region or is running STP or RSTP. The
range is 0 to 200,000,000. The default setting is Auto, which sets
port cost depending on the speed of the port. Table 14 lists the
MSTP port costs with the Auto setting when the port is not a
member of a trunk.
Table 13 MSTP Auto Update Port Trunk Internal Path Costs
Port Speed Port Cost
10 Mbps 20,000
100 Mbps 20,000
1000 Mbps 2,000
Table 14 MSTP Auto External Path Costs
Port Speed Port Cost
10 Mbps 2,000,000
100 Mbps 200,000
1000 Mbps 20,000