Alcatel-Lucent 6850-48 Reference Guide

Distributed Spanning Tree Commands

OmniSwitch CLI Reference Guide

page 15-47

Enables the switching of Spanning Tree BPDU on the flat mode Common and Internal Spanning Tree 
(CIST) instance or for an individual VLAN instance if the switch is running in the 1x1 mode.

bridge [instance] bpdu-switching {enable | disable}

The flat mode CIST instance (bridge 1) or an existing 1x1 mode VLAN 
ID instance number (bridge 1–4094).

Enables BPDU switching for the specified instance.

Disables BPDU switching for the specified instance.

By default, BPDU switching is disabled for an instance.

OmniSwitch 6400, 6850, 6855, 9000, 9000E

• Specifying the BPDU switching status for a VLAN does not depend on the current VLAN Spanning 

Tree status. For example, setting the BPDU switching status to enabled is allowed on a VLAN that also 
has Spanning Tree enabled. 

• The bridge bpdu-switching command is an implicit Spanning Tree command. When issued in the 1x1 

mode, the instance number specified implies a VLAN ID. When issued in the flat mode, the instance 
number specified implies an MSTI number. 

• If an instance is not specified with this command, the BPDU switching status is configured for the flat 

mode CIST instance by default regardless of which mode (flat or 1x1) is active on the switch.

• Note that if the switch is running in the flat mode, specifying a value greater than 1 for the instance 

will return an error message. BPDU switching is only configured for the flat mode instance (bridge 1), 
regardless of which protocol is active (STP, RSTP, or MSTP). 

-> bridge mode flat

-> bridge bpdu-switching enable

-> bridge 1 bpdu-switching disable

-> bridge mode 1x1

-> bridge 100 bpdu-switching enable

-> bridge 100 bpdu-switching disable

CIST (flat mode)