Advanced Management
Spanning Tree Port Configuration
To set the Port Priority and Port Path Cost values for STP, access the Spanning Tree Port Configuration Menu shown in Figure
IntraCore 8000 Spanning Tree Port Config. Menu Module Type:
Module: [1]
Port: [1]
Port Speed: | 100 Mbps |
Port Status: | Enabled |
Port State: | Forwarding |
Port MAC Address: | 00:00:93:8F:E3:7C |
Port Priority: | 0x80 |
Port Path Cost: | 10 |
<Cmd> <Description>
iSet Port Priority
c Set Port Path Cost
q Return to Previous Menu
Command>
Select module Next module Prev module Select port Next port Prev port
Figure 4-2 Spanning Tree Port Configuration Menu
Setting Port Priority and Path Cost
The port priority is a bridge spanning tree parameter that ranks each port. When two or more ports have the same path cost, the STP selects the path with the highest priority (lowest numerical value). By changing the priority of a port, you can make it more or less likely to become the root port. The default value is 128, and the range is
Port path cost is the bridge spanning tree parameter that assigns a cost factor to the port. The lower the assigned port path cost, the more likely the port is to be accessed. The default port path cost value is a result of the equation:
path cost = 1000/LAN speed (in Mbps)
Thus, for 10Mbps ports, the assigned default port path cost is 100. For 100Mbps ports, the default port path cost is 10. And for 1000Mbps ports, the assigned default port path cost is 1. The range is 1 to 65,535.
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