Asante Technologies 8000 Spanning Tree Port Configuration, Setting Port Priority and Path Cost

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 4-2 by typing p in the Spanning Tree Configuration Menu.

IntraCore 8000 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>

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 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 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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