Spanning Tree Commands 4

and the same instance (on each bridge) with the same set of VLANs. Also, note that RSTP treats each MSTI region as a single node, connecting all regions to the Common Spanning Tree.

Example

Console(config-mstp)#mst 1 vlan 2-5

Console(config-mstp)#

mst priority

This command configures the priority of a spanning tree instance. Use the no form to restore the default.

Syntax

mst instance_id priority priority no mst instance_id priority

•instance_id - Instance identifier of the spanning tree. (Range: 0-4094)

•priority - Priority of the a spanning tree instance.

(Range: 0-61440 in steps of 4096; Options: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, 61440)

Default Setting

32768

Command Mode

MST Configuration

Command Usage

•MST priority is used in selecting the root bridge and alternate bridge of the specified instance. The device with the highest priority (i.e., lowest numerical value) becomes the MSTI root device. However, if all devices have the same priority, the device with the lowest MAC address will then become the root device.

•You can set this switch to act as the MSTI root device by specifying a priority of 0, or as the MSTI alternate device by specifying a priority of 16384.

Example

Console(config-mstp)#mst 1 priority 4096

Console(config-mstp)#

name

This command configures the name for the multiple spanning tree region in which this switch is located. Use the no form to clear the name.

Syntax

name name

name - Name of the spanning tree.

4-157