Alcatel-Lucent 6850-48 Reference Guide

Distributed Spanning Tree Commands

OmniSwitch CLI Reference Guide

page 15-59

Configures the Spanning Tree priority for a single port or an aggregate of ports for the flat mode Common 
and Internal Spanning Tree (CIST) instance or a 1x1 mode VLAN instance. The Spanning Tree Algo-
rithm uses the port priority value to determine the most favorable port when a bridge has multiple ports 
with the same path cost to the root bridge. 

bridge instance {slot/port | logical_port} priority priority

The flat mode 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).

Port priority value (0–15). The lower the number, the higher the 
priority.

By default, the bridge port priority value is set to 7.

OmniSwitch 6400, 6850, 6855, 9000, 9000E

• The port priority specifies the value of the priority field contained in the first byte of the Port ID. The 

second byte contains the physical switch port number.

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

Tree mode implies a VLAN ID and configures the port priority value for the associated VLAN 
instance.

• If the switch is running in the flat mode and STP or RSTP 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.

-> bridge mode flat

-> bridge 1 4/1 priority 0

-> bridge mode 1x1

-> bridge 255 1/24 priority 5

-> bridge 455 3/12 priority 15

Release 6.1; command was introduced.