HP ProCurve 9304M Installation And Configuration Manual page 393

Figure 11.20 Specifying a default VLAN ID for a dual-mode port
VLAN 10
Untagged
Traffic
VLAN 20
Tagged
Traffic
In Figure 11.20, tagged port 2/11 is a dual-mode port belonging to VLANs 10 and 20. The default VLAN assigned
to this dual-mode port is 10. This means that the port transmits tagged traffic on VLAN 20 (and all other VLANs to
which the port belongs) and transmits untagged traffic on VLAN 10.
The dual-mode feature allows tagged traffic for VLAN 20 and untagged traffic for VLAN 10 to go through port 2/11
at the same time. A dual-mode port transmits only untagged traffic on its default VLAN (that is, either VLAN 1, or
a user-specified VLAN ID), and only tagged traffic on all other VLANs.
The following commands configure VLANs 10 and 20 in Figure 11.20. Tagged port 2/11 is added to VLANs 10 and
20, then designated a dual-mode port whose specified default VLAN is 10. In this configuration, port 2/11
transmits only untagged traffic on VLAN 10 and only tagged traffic on VLAN 20.
HP9300(config)# vlan 10 by port
HP9300(config-vlan-10)# untagged e 2/10
HP9300(config-vlan-10)# tagged e 2/11
HP9300(config-vlan-10)# exit
HP9300(config)# vlan 20 by port
HP9300(config-vlan-20)# tagged e 2/9
HP9300(config-vlan-20)# tagged e 2/11
HP9300(config-vlan-20)# exit
HP9300(config)# int e 2/11
HP9300(config-if-e100-2/11)# dual-mode 10
HP9300(config-if-e100-2/11)# exit
Syntax: [no] dual-mode [<vlan-id>]
Notes:
• If you do not specify a <vlan-id> in the dual mode command, the port's default VLAN is set to 1. The port
transmits untagged traffic on the DEFAULT-VLAN.
• The dual-mode feature is disabled by default. Only tagged ports can be configured as dual-mode ports.
• In trunk group, either all of the ports must be dual-mode, or none of them can be.
The show vlan command displays a separate row for dual-mode ports on each VLAN. For example:
HP9300(config)# show vlan
Total PORT-VLAN entries: 3
Maximum PORT-VLAN entries: 16
legend: [S=Slot]
PORT-VLAN 1, Name DEFAULT-VLAN, Priority level0, Spanning tree Off
Untagged Ports: (S1)
Dual-mode Port 2/11
Default VLAN ID 10
Tagged, VLAN 20
Hub
1 2 3 4 5 6
Configuring Virtual LANs (VLANs)
Port 2/10
Untagged, VLAN 10
Port 2/9
Tagged, VLAN 20
7 8
VLAN 10
Untagged
Traffic
VLAN 20
Tagged
Traffic
11 - 55