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Configuring Ethernet OAM Support for Service VLANs with Double-Tagged Customer VLANs

You can enable propagation of the Ethernet IEEE 802.1ag Operation, Administration, and Maintenance (OAM) state of a static single-tagged service VLAN (S-VLAN) to the dynamic or static double-tagged customer VLAN (C-VLAN) that has the same S-VLAN (outer) tag as the S-VLAN, and, by extension, to subscriber interfaces configured on the C-VLAN. The static S-VLAN logical interface must be configured on a Gigabit Ethernet, 10-Gigabit Ethernet, or aggregated Ethernet physical interface.

Before you begin:

To enable propagation of the Ethernet OAM state of a static single-tagged S-VLAN to dynamic or static double-tagged C-VLAN logical interfaces:

  • Configure a Gigabit Ethernet (ge), 10-Gigabit Ethernet (xe), or aggregated Ethernet (ae) physical interface to propagate the S-VLAN Ethernet OAM state to C-VLAN logical interfaces that have the same S-VLAN (outer) tag as the S-VLAN interface.

    For example, the following statement enables propagation of the Ethernet OAM state of a static single-tagged S-VLAN on Gigabit Ethernet interface ge-1/0/5 to a dynamic or static double-tagged C-VLAN logical interface with the same S-VLAN (outer) tag as the S-VLAN interface.

    Including the oam-on-svlan statement when you configure a Gigabit Ethernet, 10-Gigabit Ethernet, or aggregated Ethernet physical interface causes the router to bring down both of the following when the CFM continuity check protocol detects that the OAM state of the S-VLAN logical interface is down:

    • All dynamic or static double-tagged C-VLANs on the S-VLAN interface that have the same S-VLAN (outer) tag as the S-VLAN interface.

    • All DHCP, IP demultiplexing (IP demux), and PPPoE logical subscriber interfaces configured on the associated C-VLANs.

Example: Gigabit Ethernet Interface with Static S-VLAN, Dynamic C-VLAN, and Dynamic PPPoE Subscriber Interfaces

The following example shows a dynamic subscriber access configuration that uses the oam-on-svlan statement on a Gigabit Ethernet interface. This example configures Gigabit Ethernet physical interface ge-1/0/5 with a static single-tagged S-VLAN logical interface (ge-1/0/5.1) that runs the Ethernet 802.1ag OAM CFM continuity check protocol. A dynamic profile named double-vlans creates a dynamic double-tagged C-VLAN interface, and a dynamic profile named pppoe-profile creates dynamic PPPoE subscriber interfaces on the C-VLAN interface. The oam-on-svlan statement for ge-1/0/5 propagates the Ethernet OAM state of S-VLAN interface ge-1/0/5.1 to the C-VLAN interface and the dynamic PPPoE subscriber interfaces.

For clarity, the configuration is divided into five steps.

  1. Configure a dynamic profile named double-vlans that defines a dynamic double-tagged C-VLAN logical interface.
  2. Configure a dynamic profile named pppoe-profile that defines dynamic PPPoE subscriber interfaces on the C-VLAN.
  3. Configure Gigabit Ethernet physical interface ge-1/0/5.

    The preceding example in Step 3 configures a static, single-tagged S-VLAN logical interface (ge-1/0/5.1) with VLAN ID 1, and references the double-vlans dynamic profile to create a dynamic double-tagged C-VLAN logical interface with S-VLAN (outer) tag any and C-VLAN (inner) tag any. The tag value any represents the entire range of VLAN IDs or S-VLAN IDs, including VLAN ID 1.

    Because the C-VLAN outer tag (any) matches the S-VLAN tag VLAN ID 1, the oam-on-svlan statement in the configuration causes the router to propagate the Ethernet OAM state of S-VLAN ge-1/0/5.1 to the dynamic double-tagged C-VLAN logical interface (created by the double-vlans dynamic profile) and, by extension, to the dynamic PPPoE subscriber interfaces on the C-VLAN (created by the pppoe-profile dynamic profile).

  4. Configure the Ethernet 802.1ag OAM CFM continuity check protocol on the static S-VLAN interface (ge-1/0/5.1).

    If the CFM continuity check protocol detects that the Ethernet OAM state of S-VLAN interface ge-1/0/5.1 is down, the interface-down action in the myDefault action profile causes the router to bring down both of the following:

    • The dynamic double-tagged C-VLAN logical interface that has the same S-VLAN (outer) tag as S-VLAN interface ge-1/0/5.1

    • The dynamic PPPoE subscriber interfaces configured on the dynamic C-VLAN interface

  5. Create a PPP access profile.

    For brevity, this configuration is only partially shown. The missing portions of the configuration are replaced with ellipses (...).

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