Alcatel Carrier Internetworking Solutions Switch/Router - page 435

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while VLAN 2 traffic is allowed to pass. The reverse is true for Switch 1 and Switch 3 (i.e.,
VLAN 2 traffic is blocked, while VLAN 1 traffic is allowed to pass).
Service commands are used in Ethernet modules to assign groups to 10/100 and Gigabit ports.
The cas, das, mas, and vas commands create, delete, modify, and view trunk services created
to handle 802.1Q traffic over an Ethernet backbone. This trunk service, coupled with the
default bridging service, allows you to pass both tagged and untagged frames over the same
port.
The following diagram shows the logical structure of the trunked 802.1Q groups:
Logical Configuration of Multiple Groups on a Single Port
In the above diagram, Groups 2 and 3 have been trunked to the physical port with an 802.1Q
trunking service.
Group 1
(Untagged)
Group 2
(802.1Q)
Group 3
(802.1Q)
Physical Port
Logical Ports
802.1Q Trunking Services
Default Bridging
Service