Example 2: Vlans With Tagged Backplane Ports - 3Com 4007 Implementation Manual

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HAPTER IRTUAL
LAN (VLAN )
S S
In this example:
A single VLAN spans multiple switching modules. (It can be a modified
default VLAN.)
The backplane ports of the switching modules and the switch fabric
module are part of the VLAN.
All traffic that passes between switching modules flows through the
switch fabric module:
The backplane port of Module-XX connects to Port 9 of the switch
fabric module.
The backplane port of Module-YY connects to Port 21 of the
switch fabric module.
Station-A can pass traffic to Station-B.

Example 2: VLANs with Tagged Backplane Ports

The configuration in shows two VLANs that span two Layer 2 switching
modules and pass traffic through the switch fabric module (which resides
in slot 7 but is logically represented above the other modules):
VLAN1 (the default, user-modified)
VLAN2 (user-configured, port-based VLAN)
Because VLAN1 and VLAN2 span switching modules, they must be
defined on the switch fabric module. One VLAN (VLAN1) must be tagged
on the backplane ports of the switching modules and on the
corresponding switch fabric module ports.