Asante Technologies 9000 manual Setting Port Priority and Path Cost

Advanced Management

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 Priority
c	Set Port Path Cost
q	Return to Previous Menu

Command>

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

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