Accton Technology ES3526XA, ES3552XA manual Spanning-tree mst cost, Auto

4 Command Line Interface

Default Setting

auto

Command Mode

Interface Configuration (Ethernet, Port Channel)

Command Usage

•Specify a point-to-point link if the interface can only be connected to exactly one other bridge, or a shared link if it can be connected to two or more bridges.

•When automatic detection is selected, the switch derives the link type from the duplex mode. A full-duplex interface is considered a point-to-point link, while a half-duplex interface is assumed to be on a shared link.

•RSTP only works on point-to-point links between two bridges. If you designate a port as a shared link, RSTP is forbidden. Since MSTP is an extension of RSTP, this same restriction applies.

Example

Console(config)#interface ethernet ethernet 1/5

Console(config-if)#spanning-tree link-type point-to-point

spanning-tree mst cost

This command configures the path cost on a spanning instance in the Multiple Spanning Tree. Use the no form to restore the default.

Syntax

spanning-tree mst instance_id cost cost no spanning-tree mst instance_id cost

•instance_id - Instance identifier of the spanning tree. (Range: 0-4094, no leading zeroes)

•cost - Path cost for an interface. (Range: 1-200,000,000) 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

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