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Chapter 22: Spanning Tree and Rapid Spanning Tree Protocols
434 Section V: Spanning Tree Protocols
The following prompt is displayed:
Ending Port to Configure [1 to 24] ->
7. To configure just one port, enter the same port number here as you
entered in the previous step. To configure a range of ports, enter the
last port of the range.
The Configure RSTP Port Settings menu is shown in Figure 159.
Figure 159. Configure RSTP Port Settings Menu
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 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 6 on page 427.
2 - 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 20,000,000. The default setting is Automatic Update,
which sets port cost depending on the speed of the port. Table 9 lists
the RSTP port costs with Auto-Detect.
Allied Telesis AT-9424T/SP - AT-S63
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User: Manager 11:20:02 02-Mar-2005
Configure RSTP Port Settings
Configuring Ports 4-4
1 - Port Priority ...... 128
2 - Port Cost .......... Automatic Update
3 - Point-to-Point ..... Auto Detect
4 - Edge Port .......... Yes
C - Check Migration to RSTP on Selected Ports (MCHECK)
R - Return to Previous Menu
Enter your selection?
Table 9. RSTP Auto-Detect Port Costs
Port Speed Port Cost
10 Mbps 2,000,000
100 Mbps 200,000
1000 Mbps 20,000