Alcatel OmniSwitch 6600 Family Network Configuration Manual page 107

Configuring Spanning Tree Parameters
The following diagram shows a switch running in the 1x1 Spanning Tree mode and shows Spanning Tree
participation for both fixed and tagged ports.
Port 1/3
Default VLAN 5
Port 2/3
Default VLAN 5
In the above example, STP2 is a single Spanning Tree instance since VLAN 5 contains only fixed ports.
STP 3 and STP 4 are a combination of single and 802.1Q Spanning Tree instances because VLAN 2
contains both fixed and tagged ports. On ports where VLAN 2 is the default VLAN, BPDU are not tagged.
On ports where VLAN 2 is a tagged VLAN, BPDU are also tagged.
OmniSwitch 6600 Family Network Configuration Guide
STP 3
STP 2
Switch
Port 1/4
Default VLAN 2
1x1 (single and 802.1Q) Spanning Tree Example
STP 4
Port 2/4
Default VLAN 2
April 2006
Spanning Tree Operating Modes
Port 1/5
Default VLAN 10
VLAN 2 (tagged)
Port 2/5
Default VLAN 2
VLAN 10 (tagged)
page 5-11