Accton Technology ES3552XA, ES3526XA manual Spanning-tree port-priority

Spanning Tree Commands 4

The recommended range is:

•Ethernet: 200,000-20,000,000

•Fast Ethernet: 20,000-2,000,000

•Gigabit Ethernet: 2,000-200,000

Default Setting

By default, the system automatically detects the speed and duplex mode used on each port, and configures the path cost according to the values shown below. Path cost “0” is used to indicate auto-configuration mode. When the short path cost method is selected and the default path cost recommended by the IEEE 8021w standard exceeds 65,535, the default is set to 65,535.

•Ethernet – half duplex: 2,000,000; full duplex: 1,000,000; trunk: 500,000

•Fast Ethernet – half duplex: 200,000; full duplex: 100,000; trunk: 50,000

•Gigabit Ethernet – full duplex: 10,000; trunk: 5,000

Command Mode

Interface Configuration (Ethernet, Port Channel)

Command Usage

•This command is used by the Spanning Tree Algorithm to determine the best path between devices. Therefore, lower values should be assigned to ports attached to faster media, and higher values assigned to ports with slower media.

•Path cost takes precedence over port priority.

•When the spanning-tree pathcost method (page 4-165)is set to short, the maximum value for path cost is 65,535.

Example

Console(config)#interface ethernet 1/5

Console(config-if)#spanning-tree cost 50

Console(config-if)#

spanning-tree port-priority

This command configures the priority for the specified interface. Use the no form to restore the default.

Syntax

spanning-tree port-priority priority no spanning-tree port-priority

priority - The priority for a port. (Range: 0-240, in steps of 16)

Default Setting

128

Command Mode

Interface Configuration (Ethernet, Port Channel)

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