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Post  Post subject: FreeBSD - Adding VLAN Tagged subinterface using ifconfig  |  Posted: Mon Aug 19, 2013 10:44 am
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FreeBSD - Adding VLAN Tagged subinterface using ifconfig

Here's how to add a tagged vlan interface in FreeBSD all versions.

Step 1: create the vlan subinterface:
Code:
# ifconfig vlan122 create


Step 2: assign it a vlan ID and vlan device:
Code:
# ifconfig vlan122 vlan 122 vlandev em0


Step 3: check the vlan subinterface:
Code:
# ifconfig vlan122
vlan122: flags=8842<BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:07:e9:a5:9b:fa
        media: Ethernet autoselect (1000baseTX <full-duplex>)
        status: active
        vlan: 122 parent interface: em0

You will notice that interface status is not UP. This has to be changed once it is used.

Step 4: assign ip address:
Code:
# ifconfig vlan122 10.1.122.1/24
# ifconfig vlan122 up
# ifconfig vlan122
vlan122: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:07:e9:a5:9b:fa
        inet 10.1.122.1 netmask 0xffffff00 broadcast 10.1.122.255
        media: Ethernet autoselect (1000baseTX <full-duplex>)
        status: active
        vlan: 122 parent interface: em0


This subinterface will be equivalent of a tagged logical interface in different vendors (Juniper for example).

To make this vlan tagged interface configuration persistent after reboot, edit /etc/rc.conf file and add the following line / alter cloned_interfaces in the networking section:
Code:
cloned_interfaces="... vlan122"
ifconfig_vlan122="inet 10.1.122.1/24 vlan 122 vlandev em0"

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