Alcatel-Lucent 6850-48 Reference Guide

Distributed Spanning Tree Commands

OmniSwitch CLI Reference Guide

page 15-81

Configures Manual mode (forwarding or blocking) or Dynamic mode to manage the state of a port or an 
aggregate of ports for the flat mode Common and Internal Spanning Tree (CIST) instance or a 1x1 mode 
VLAN instance. Dynamic mode defers the configuration of the port state to the Spanning Tree Protocol.

bridge instance {slot/port | logical_port} mode {forwarding | blocking | dynamic}

The CIST instance or an existing VLAN ID number (1–4094).

Enter the slot number for the module and the physical port number on 
that module (e.g., 3/1 specifies port 1 on slot 3).

Link aggregate ID number (0–31).

Set port state to forwarding. 

Set port state to blocking. 

Port state is determined by Spanning Tree Protocol.

By default, the port Spanning Tree mode is set to dynamic.

OmniSwitch 6400, 6850, 6855, 9000, 9000E

• Specifying an instance number with this command when the switch is running the 1x1 Spanning Tree 

operating mode implies a VLAN ID and configures the port Spanning Tree mode (forwarding, block-
ing, or dynamic) for the associated VLAN instance.

• If the switch is running in the flat mode and STP (802.1D) or RSTP (802.1W) is the active protocol, 

enter 1 to specify the CIST instance. If MSTP is the active protocol, however, entering 1 for the 
instance number is not accepted. In this case, use the 

 command instead.

• Note that for Multiple Spanning Tree Instances (MSTI), the port Spanning Tree mode is inherited from 

the CIST instance and is not a configurable parameter.

• When port state is manually set to forwarding or blocking, the port remains in that state until it is 

changed using this command.

• Ports manually configured to operate in a forwarding or blocking state do not participate in the Span-

ning Tree Algorithm.