KB.15.15

5. Configure MST instance port parameters. HP recommends that you apply changes on a per-port

basis only where a non-default setting is clearly indicated by the circumstances of individual

links. For example, you might want to set the path cost value for the ist or for the ports used

by a specific MST instance. Use the following command:

spanning-tree instance ist | 1..16 port-list path-cost

[ auto | 1..200000000 ]

Alternatively, leaving this setting at the default (auto) allows the switch to calculate the path-cost

from the link speed.

6. Enable spanning tree operation on the switch with the spanning-tree command.

Configuring MSTP operation mode and global settings

The commands in this section apply at the switch (global) level.

Selecting MSTP as the spanning tree mode

Syntax:

spanning-tree mode mstp

Specifies that spanning tree will run in MSTP mode.

Clearing spanning tree debug counters

Syntax:

spanning-tree clear-debug-counters

Clears spanning tree debug counters.

Resetting the configuration name of the MST region in which a switch resides

Syntax:

[no] spanning-tree config-name ascii-string

Resets the configuration name of the MST region in which the switch resides. This

name can include up to 32 nonblank characters and is case-sensitive. On all switches

within a given MST region, the configuration names must be identical. For more

than one MSTP switch in the same MST region, the identical region name must be

configured on all such switches. If the default configuration name is retained on a

switch, it cannot exist in the same MST region with another switch.

The default name is a text string using the hexadecimal representation of the switch's

MAC address.

The no form of the command overwrites the currently configured name with the

default name.

NOTE: This option is available only when the switch is configured for MSTP

operation. There is no defined limit on the number of regions you can configure.

Designating the revision number of the MST region for a switch

Syntax:

spanning-tree config-revision revision-number

Configures the revision number designated for the MST region in which you want

the switch to reside. This setting must be the same for all switches residing in the

Configuring MSTP operation mode and global settings 79