Technical data

Switching and Routing
May 2012 © 2012 Brocade Communications Systems, Inc. 2 - 13
ServerIron(config-if-e100-2/11)#dual-mode
ServerIron(config-if-e100-2/11)#exit
Syntax: [no] dual-mode
Starting with Release 09.5.02a, you can configure a dual-mode port to transmit traffic for a specified VLAN (which
is defined as Default VLAN) as untagged, while transmitting traffic for other VLANs as tagged. Figure 2.2
illustrates this enhancement.
Figure 2.2 Specifying a default VLAN ID for a dual-mode port
In Figure 2.2, 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 2.2. 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.
ServerIron(config)#vlan 10 by port
ServerIron(config-vlan-10)#untagged e 2/10
ServerIron(config-vlan-10)#tagged e 2/11
ServerIron(config-vlan-10)#exit
ServerIron(config)#vlan 20 by port
ServerIron(config-vlan-20)#tagged e 2/9
ServerIron(config-vlan-20)#tagged e 2/11
ServerIron(config-vlan-20)#exit
ServerIron(config)#int e 2/11
ServerIron(config-if-e100-2/11)#dual-mode 10
ServerIron(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.
VLAN 10
Untagged
Traffic
Port 2/9
Tagged, VLAN 20
Port 2/10
Untagged, VLAN 10
VLAN 20
Tagged
Traffic
Hub
Dual-mode
Default VLAN ID 10
Port 2/11
Tagged, VLAN 20
VLAN 10
Untagged
Traffic
VLAN 20
Tagged
Traffic