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Configuring Spanning Tree Parameters Sample Spanning Tree Configuration
OmniSwitch 6600 Family Network Configuration Guide April 2006 page 5-29
Sample Spanning Tree Configuration
This section provides an example network configuration in which Spanning Tree 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
Chapter 6, “Using 802.1s Multiple Spanning Tree,” for an overview and examples of using MSTP
(802.1s).
Example Network Overview
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:
Example Active Spanning Tree Topology
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.
OmniSwitch 6648
OmniSwitch 6648
OmniSwitch 6648
OmniSwitch 6648
VLAN 255 Bridge ID
VLAN 255 Bridge ID
VLAN 255 Bridge ID
VLAN 255 Bridge ID
Forwarding
Blocking
Root Port
Designated Port
10, 00:d0:95:00:00:01
32768, 00:d0:95:00:00:04
32768, 00:d0:95:00:00:03
32768, 00:d0:95:00:00:02
Path Cost
PC
PC=4 3/3
OmniSwitch 7700
TM
OmniSwitch 7700
TM
(Root Bridge)
(Designated Bridge)
2/1
2/10
2/2
2/3
3/10
3/12/9
3/8
PC=4
3/2
3/9
PC=4
PC=19
PC=4
PC=19
Switch C
Switch A
Switch D
Switch B
2/8