Spanning Tree Commands 4

Related Commands

spanning-treeedge-port(4-161)

spanning-tree link-type

This command configures the link type for Rapid Spanning Tree and Multiple Spanning Tree. Use the no form to restore the default.

Syntax

spanning-tree link-type {auto point-to-point shared} no spanning-tree link-type

auto - Automatically derived from the duplex mode setting.point-to-point - Point-to-point link.shared - Shared medium.

Default Setting

auto

Command Mode

Interface Configuration (Ethernet Ports 1-8, 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)

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