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Figure 5-2 Spanning Tree Port Configuration menu
Setting Port Priority and Path Cost
Use the following procedure to set the STP Port Priority and Path Cost values.
The port priority is a Bridge Spanning Tree parameter that ranks each port.
When 2 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 0-255.
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 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 1-65,535.
1 Access the Spanning Tree Port Configuration menu by typ-
ing p in the Spanning Tree Configuration menu.
2 Use the m, x, and v commands to select the module with
the port you want to configure.
3 Use the s, n, and p commands to select the port you want to
IntraChassis 9000 Spanning Tree Port Config. Menu Module Type: (24-
100TX)
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>
i Set Port Pri
ority
c Set Port Path C
ost
q Return to Previous Menu
Command>
GLXY9.book Page 6 Thursday, February 17, 2000 3:04 PM