Allied Telesis AT-S63 - Manual (Page 534)

Chapter 22: MSTP
534 Section IV: Spanning Tree Protocols
7. Adjust the following parameters as necessary:
1- 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 15 lists the MSTP port
costs with the Auto setting when the port is not a member of a trunk.
Table 16 lists the MSTP port costs with the Auto setting when the port
is part of a port trunk.
2 - 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 “Point-to-Point
and Edge Ports” on page 481.
3 - Edge Port
This parameter defines whether the port is functioning as an edge port.
For an explanation of this parameter, refer to “Point-to-Point and Edge
Ports” on page 481.
8. After making changes, type R until you return to the Main Menu. Then
type S to select Save Configuration Changes.
Configuring
MSTI-specific
Port Parameters
This procedure explains how to set a port’s priority and internal path cost.
These parameters can be set independently on a port for each MSTI in
which a port is a member. To configure the parameters, perform the
following procedure:
1. From the Main Menu, type 3 to select Spanning Tree Configuration.
Table 15 Auto External Path Costs
Port Speed Port Cost
10 Mbps 2,000,000
100 Mbps 200,000
1000 Mbps 20,000
Table 16. Auto External Path Trunk Costs
Port Speed Port Cost
10 Mbps 20,000
100 Mbps 20,000
1000 Mbps 2,000