`spanning-tree extend-system-id`

Syntax

spanning-tree extend-system-id {enable | disable}

no spanning-tree extend-system-id

Description

Configures use of extended system ID. When enabled, the VLAN ID is included in spanning tree packets. When disabled, the VLAN ID is set to NULL in the spanning tree packets.

By default, extended system ID is enabled. If you disable extended system ID, the bridge identifier field in the spanning tree packet is filled with zeros.

The no form of this command disables extended system ID.

Command context

config

Parameters

enable: Specifies enabling use of extended system ID.
disable: Specifies disabling use of extended system ID.

Authority

Administrators

Examples

Enabling extended system ID:

switch# config
switch(config)# spanning-tree extend-system-id enable

Disabling extended system ID:

switch# config
switch(config)# spanning-tree extend-system-id disable
switch(config)# no spanning-tree extend-system-id