3Com 3 manual Configuration that separates VLANs

Using STP on a Network with Multiple VLANs 43

Figure 10 Configuration that separates VLANs

To avoid any VLAN subdivision, it is recommended that all inter-Switch connections are made members of all available 802.1Q VLANs to ensure connectivity at all times. For example, the connections between Switches A and B, and between Switches A and C should be 802.1Q tagged and carrying VLANs 1 and 2 to ensure connectivity.

For more information about VLAN Tagging, see Chapter 8 “Setting Up Virtual LANs”.