Technical Documentation

Configuring S-VLAN Subinterfaces

Tasks to configure an S-VLAN subinterface include:

To configure an S-VLAN subinterface:

Specify a Fast Ethernet, Gigabit Ethernet, or 10-Gigabit Ethernet port.
host1(config)#interface fastEthernet 4/0
Specify VLAN as the encapsulation method.
host1(config-if)#encapsulation vlan
The VLAN major interface is added.
Create a VLAN subinterface by adding a subinterface number to the interface identification command.
host1(config-if)#interface fastEthernet 4/1.1
Assign an S-VLAN ID and a VLAN ID for the subinterface.
host1(config-if)#svlan id 4 255
Assign an S-VLAN Ethertype.
host1(config-if)#svlan ethertype 88a8

To configure PPPoE over an S-VLAN over an Ethernet interface:

Specify a Fast Ethernet, Gigabit Ethernet, or 10-Gigabit Ethernet port.
host1(config)#interface fastEthernet 4/0
Specify VLAN as the encapsulation method.
host1(config-if)#encapsulation vlan
The VLAN major interface is added.
Create a VLAN subinterface by adding a subinterface number to the interface identification command.
host1(config-if)#interface fastEthernet 4/1.1
Assign an S-VLAN ID and a VLAN ID for the subinterface.
host1(config-if)#svlan id 4 255
Assign an S-VLAN Ethertype.
host1(config-if)#svlan ethertype 88a8
Specify PPPoE as the encapsulation method on the interface.
host1(config-if)#pppoe
Create a PPPoE subinterface.
host1(config-if)#pppoe subinterface fastEthernet 4/1.1.1
Specify PPP as the encapsulation method on the interface.
host1(config-if)#encapsulation ppp
Assign an IP address and mask.
host1(config-if)#ip address 164.10.6.61 255.255.255.0
(Optional) Configure additional PPPoE subinterfaces by completing Steps 7 through 9 using unique numbering.

Figure 1 shows one S-VLAN subinterface with multiple PPPoE subinterface stacks.

Note: Before you can remove an S-VLAN/VLAN subinterface, you must remove the upper-layer interface stack.

Figure 1: Example of PPPoE over S-VLAN Stacking Configuration Procedure