Example: Creating two VLANs

7.1 LPAR mode z/VM guest

VLANs are allocated in an existing interface that represents a physical Ethernet LAN.

The following example creates two VLANs, one with ID 3 and one with ID 5.

# ip addr add 198.51.160.23/19 dev eth1
# ip link set dev eth1 up
# ip link add dev eth1.3 link eth1 type vlan id 3
# ip link add dev eth1.5 link eth1 type vlan id 5

The ip link add commands added interfaces eth1.3 and eth1.5, which you can then configure:

# ip addr add  1.2.3.4/24    dev eth1.3
# ip link set dev eth1.3 up
# ip addr add  10.100.2.3/16 dev eth1.5
# ip link set dev eth1.5 up

The traffic that flows out of eth1.3 is in the VLAN with ID=3. This traffic is not received by other stacks that listen to VLANs with ID=4.

The internal routing table ensures that every packet to 1.2.3.x goes out through eth1.3, and everything to 10.100.x.x through eth1.5. Traffic to 198.51.1xx.x flows through eth1 (without a VLAN tag).

To remove one of the VLAN interfaces:

# ip link set dev eth1.3 down
# ip link delete eth1.3 type vlan