Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Navigation
Guide That Contains This Content
[+] Expand All
[-] Collapse All

    Configuring VLAN Subinterfaces

    Ethernet interfaces support IP, PPPoE, MPLS, or both IP and PPPoE on each VLAN. In addition to a VLAN major interface level, a VLAN subinterface level distinguishes the VLAN.

    Note: You cannot configure VLANs on the Fast Ethernet port of the SRP module.

    Tasks to configure VLAN subinterfaces are:

    Creating a VLAN Major Interface

    To use VLANs, you must first configure the Ethernet interface for VLAN encapsulation. This creates the VLAN major interface.

    To configure the Ethernet interface for VLAN encapsulation:

    1. Specify a Fast Ethernet, Gigabit Ethernet, or 10-Gigabit Ethernet port.
      host1(config)#interface fastEthernet 4/0
    2. Specify VLAN as the encapsulation method.
      host1(config-if)#encapsulation vlan

      The router creates the VLAN major interface.

    You can now create multiple VLAN subinterfaces to carry higher-level protocols. For examples, see Configuring VLAN Subinterfaces, next.

    Configuring IP over VLAN

    To configure IP over VLAN over an Ethernet interface:

    1. Specify a Fast Ethernet, Gigabit Ethernet, or 10-Gigabit Ethernet port.
      host1(config)#interface fastEthernet 4/0
    2. Specify VLAN as the encapsulation method.
      host1(config-if)#encapsulation vlan

      The VLAN major interface is added.

    3. Create a VLAN subinterface by adding a subinterface number to the interface identification command.
      host1(config-if)#interface fastEthernet 4/0.3
    4. Do one of the following:
      1. Assign a VLAN ID for the subinterface.
        host1(config-if)#vlan id 201
      2. Assign a VLAN ID and the optional unique MAC address for the subinterface.
        host1(config-if)#vlan id 201 mac-address 0090.1a01.1234
    5. Assign an IP address and mask.
      host1(config-if)#ip address 192.6.129.5 255.255.255.0
    6. (Optional) Configure additional VLAN subinterfaces by completing Steps 3 through 5.

    Figure 1 illustrates the IP/VLAN/Fast Ethernet stacking, showing two separate VLAN subinterfaces. Configure one VLAN subinterface entirely; then configure the next VLAN subinterface.

    Figure 1: Example of IP/VLAN/Fast Ethernet Stacking Configuration Procedure

    Example of IP/VLAN/Fast Ethernet Stacking
Configuration Procedure

    Configuring PPPoE over VLAN

    To configure PPPoE over VLAN over an Ethernet interface:

    1. Specify a Fast Ethernet, Gigabit Ethernet, or 10-Gigabit Ethernet port.
      host1(config)#interface fastEthernet 4/1
    2. Specify VLAN as the encapsulation method.
      host1(config-if)#encapsulation vlan

      The VLAN major interface is added.

    3. Create a VLAN subinterface by adding a subinterface number to the interface identification command.
      host1(config-if)#interface fastEthernet 4/1.1
    4. Do one of the following:
      • Assign a VLAN ID for the subinterface.
        host1(config-if)#vlan id 201
      • Assign a VLAN ID and the optional unique MAC address for the subinterface.
        host1(config-if)#vlan id 201 mac-address 0090.1a01.1234
    5. Specify PPPoE as the encapsulation method on the interface.
      host1(config-if)#pppoe
    6. Create a PPPoE subinterface.
      host1(config-if)#pppoe subinterface fastEthernet 4/1.1.1
    7. Specify PPP as the encapsulation method on the interface.
      host1(config-if)#encapsulation ppp
    8. Assign an IP address and mask.
      host1(config-if)#ip address 192.6.129.5 255.255.255.0
    9. (Optional) Configure additional VLAN subinterfaces by completing Steps 3 through 8.

    Figure 2 illustrates the PPPoE/VLAN/Fast Ethernet stacking, showing two separate VLAN subinterfaces. One VLAN subinterface has two PPPoE subinterfaces, and one VLAN subinterface has one PPPoE subinterface.

    Figure 2: Example of PPPoE/VLAN/Fast Ethernet Stacking Configuration Procedure

    Example of PPPoE/VLAN/Fast Ethernet Stacking
Configuration Procedure

    Configuring MPLS over VLAN

    To configure MPLS over VLAN over an Ethernet interface:

    1. Specify a Fast Ethernet, Gigabit Ethernet, or 10-Gigabit Ethernet port.
      host1(config)#interface fastEthernet 4/0
    2. Specify VLAN as the encapsulation method.
      host1(config-if)#encapsulation vlan

      The VLAN major interface is added.

    3. Create a VLAN subinterface by adding a subinterface number to the interface identification command.
      host1(config-if)#interface fastEthernet 4/1.1
    4. Do one of the following:
      • Assign a VLAN ID for the subinterface.
        host1(config-if)#vlan id 400
      • Assign a VLAN ID and the optional unique MAC address for the subinterface.
        host1(config-if)#vlan id 400 mac-address 0090.1a01.1234
    5. Enable MPLS on the interface.
      host1(config-if)#mpls

    Figure 3 illustrates the MPLS/VLAN/Fast Ethernet stacking, showing one VLAN subinterface.

    Figure 3: Example of MPLS/VLAN/Fast Ethernet Stacking Configuration Procedure

    Example of MPLS/VLAN/Fast Ethernet Stacking
Configuration Procedure

    Configuring IP over VLAN and PPPoE over VLAN

    To configure IP over VLAN with PPPoE over the same VLAN over an Ethernet interface:

    1. Specify a Fast Ethernet, Gigabit Ethernet, or 10-Gigabit Ethernet port.
      host1(config)#interface fastEthernet 4/1
    2. Specify VLAN as the encapsulation method.
      host1(config-if)#encapsulation vlan

      The VLAN major interface is added.

    3. Create a VLAN subinterface by adding a subinterface number to the interface identification command.
      host1(config-if)#interface fastEthernet 4/1.1
    4. Do one of the following:
      • Assign a VLAN ID for the subinterface.
        host1(config-if)#vlan id 400
      • Assign a VLAN ID and the optional unique MAC address for the subinterface.
        host1(config-if)#vlan id 400 mac-address 0090.1a01.1234
    5. Create an IP interface on the same VLAN as the PPPoE interface.
      host1(config-if)#ip address 164.10.6.71 255.255.255.0
    6. Specify PPPoE as the encapsulation method on the interface.
      host1(config-if)#pppoe
    7. Create a PPPoE subinterface.
      host1(config-if)#pppoe subinterface fastEthernet 4/1.1.1
    8. Specify PPP as the encapsulation method on the interface.
      host1(config-if)#encapsulation ppp
    9. Assign an IP address and mask.
      host1(config-if)#ip address 192.6.129.5 255.255.255.0
    10. (Optional) Configure additional PPPoE subinterfaces by completing Steps 7 through 9 using unique numbering.

    To configure additional IP interfaces over the VLAN major interface:

    1. Create a new VLAN subinterface by adding a unique subinterface number to the interface identification command.
      host1(config-if)#interface fastEthernet 4/1.2
    2. Assign a VLAN ID for the subinterface.
      host1(config-if)#vlan id 401
    3. Assign an IP address and mask.
      host1(config-if)#ip address 164.10.6.51 255.255.255.0

    Figure 4 illustrates the configuration steps for two VLAN subinterfaces. In this example:

    • VLAN subinterface 4/1.1 has an IP interface, a PPPoE interface, and multiple PPPoE subinterface stacks.
    • VLAN subinterface 4/1.2 has only an IP interface.

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

      Figure 4: Example of PPPoE over VLAN with IP over VLAN Stacking Configuration Procedure

      Example of PPPoE over VLAN with IP over
VLAN Stacking Configuration Procedure

    Published: 2014-08-14