Alcatel-Lucent 6850-48 Network Guide

Sample Spanning Tree Configuration

Configuring Spanning Tree Parameters

page 13-40

OmniSwitch AOS Release 6 Network Configuration Guide

This section provides an example network configuration in which the Spanning Tree Algorithm and Proto-
col has calculated a loop-free topology. In addition, a tutorial is also included that provides steps on how 
to configure the example network topology using the Command Line Interface (CLI).

Note that the following example network configuration illustrates using switches operating in the 1x1 
Spanning Tree mode and using RSTP (802.1w) to calculate a single data path between VLANs. See 

 for an overview and examples of using MSTP 

(802.1s).

The following diagram shows a four-switch network configuration with an active Spanning Tree topol-
ogy, which was calculated based on both configured and default Spanning Tree parameter values:

In the above example topology: 

• Each switch is operating in the 1x1 Spanning Tree mode by default. 

• Each switch configuration has a VLAN 255 defined. The Spanning Tree administrative status for this 

VLAN was enabled by default when the VLAN was created. 

• VLAN 255 on each switch is configured to use the 802.1w (rapid reconfiguration) Spanning Tree 

Algorithm and Protocol.

• Ports 2/1-3, 2/8-10, 3/1-3, and 3/8-10 provide connections to other switches and are all assigned to 

VLAN 255 on their respective switches. The Spanning Tree administrative status for each port is 
enabled by default.