Allied Telesis AT-S63 - Manual (Page 536)

Chapter 22: MSTP
536 Section IV: Spanning Tree Protocols
Configure Per Spanning Tree Port Settings Menu is shown in Figure
192.
Figure 192. Configure Per Spanning Tree Port Settings Menu
The Spanning Tree List displays the ID numbers of the MSTIs you
specified.
8. Adjust the following parameters as necessary:
1 - Port Priority
This parameter is used as a tie breaker when two or more ports are
determined to have equal costs to the regional 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 14, “Port Priority Value
Increments” on page 479.
2- Port Internal Path Cost
The port cost of the port if the port is connected to a bridge which is
part of the same MSTP region. The range is 0 to 200,000,000. The
default setting is 0, Auto Update, which sets port cost depending on
the speed of the port. Default values are 2,000,000 for 10 Mbps ports,
200,000 for a 100 Mbps ports, and 20,000 for one gigabit ports.
Table 17 lists the RSTP port costs with Auto-Detect.
Allied Telesyn Ethernet Switch AT-94xx - AT-S63
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User: Manager 11:20:02 02-Mar-2005
Configure Per Spanning Tree Port Settings
Spanning Tree List: 4
Configuring Ports: 7-7
1 - Port Priority ............... 128
2 - Port Internal Path Cost ..... Auto Update
R - Return to Previous Menu
Enter your selection?
Table 17. RSTP Auto-Detect Port Costs
Port Speed Port Cost
10 Mbps 2,000,000
100 Mbps 200,000
1000 Mbps 20,000