Vlan Participation In Spanning Tree Groups; Figure 5-2:Implementing Multiple Spanning Tree Groups - Nortel Alteon OS 42C4911 Application Manual

Alteon OS Application Guide
Figure 5-2 Implementing Multiple Spanning Tree Groups

VLAN Participation in Spanning Tree Groups

The VLAN participation for each Spanning Tree Group in
in the following sections:
VLAN 1 Participation
If application switch A is the root bridge, then application switch A will transmit the
BPDU for VLAN 1 on ports 1 and 2. Application switch C receives the BPDU on its
port 2 and application switch D receives the BPDU on its port 1. Application switch D will
block port 8 or application switch C will block port 1 depending on the information pro-
vided in the BPDU.
VLAN 2 Participation
Application switch A, the root bridge generates another BPDU for Spanning Tree Group 2
and forwards it out from port 8. GbE Switch Module B receives this BPDU on its port 17.
Port 17 on GbE Switch Module B is on VLAN 2, Spanning Tree Group 2. Because switch
B has no additional ports participating in Spanning Tree Group 1, this BPDU is not for-
warded to any additional ports and application switch A remains the designated root.
112 Chapter 5: Spanning Tree Group
17
17
Switch B Switch B
18 18
BladeCenter
Figure 5-2 on page 112 is discussed
42C4911, January 2007