3Com 3500 manual Bridge port stpCost

290CHAPTER 10: BRIDGE PORT PARAMETERS

bridge port stpCost

✓3500

✓9000

✓9400

✓3900

✓9300

Sets the path cost that the Spanning Tree Protocol (STP) adds to the root cost field in a configuration message that the port receives. The system uses this value to determine the path cost to the root through the port. The current value is shown in the pathCost field of the bridge port detail display.

Valid Minimum Abbreviation

b po stpc

Important Considerations

■You can use this command to configure the same setting on multiple ports simultaneously. When you specify multiple port numbers, the system prompts you to choose the setting and then applies it to all of the ports.

■A larger path cost value makes the LAN that is reached through the port more likely to be low in the Spanning Tree topology. The lower the LAN is in the topology, the less through traffic it carries. For this reason, you may want to assign a large path cost to a LAN that has a lower bandwidth or to one on which you want to minimize traffic.

■If your configuration is successful, the previous menu appears. If the configuration is not successful, the system notifies you that your changes failed, and you can try to reenter your changes.

■See the IEEE 802.1D MAC Bridges standard for recommended path cost settings.

Options

Prompt	Description	Possible Values	[Default]
Bridge ports	Bridge ports for which you	One or more valid	–
	want to set the path cost	bridge port
		numbers
STP cost	Configurable bridge port STP	1 – 65535	■	100
	parameter that specifies the			(Ethernet)
	cost to add to the total path		■	10 (Fast
	cost when this port is the root
				Ethernet)
	port
				1 (Gigabit
			■
				Ethernet)