On MX Series routers with MPC/MIC interfaces, 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:

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.
   [edit]

   dynamic-profiles {double-vlans {interfaces {"$junos-interface-ifd-name" {unit "$junos-interface-unit" {vlan-tags outer "$junos-stacked-vlan-id" inner "$junos-vlan-id";encapsulation ppp-over-ether;pppoe-underlying-options {dynamic-profile pppoe-profile;}}}}}}
2. Configure a dynamic profile named pppoe-profile that defines dynamic PPPoE subscriber interfaces on the C-VLAN.
   [edit]

   dynamic-profiles {pppoe-profile {interfaces {pp0 {unit "$junos-interface-unit" {pppoe-options {underlying-interface "$junos-underlying-interface";server;}family inet {unnumbered-address lo0.0;}}}}}}
3. Configure Gigabit Ethernet physical interface ge-1/0/5.
   [edit]

   interfaces {ge-1/0/5 {description "connect to remote router";flexible-vlan-tagging;oam-on-svlan;unit 1 {vlan-id 1;}auto-configure {stacked-vlan-ranges {dynamic-profile double-vlans {accept any;ranges {any,any;}}}}}lo0 {unit 0 {family inet {address 100.1.1.1/32 {primary;}}}}}

   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).
   [edit]

   protocols {oam {ethernet {connectivity-fault-management {action-profile myDefault {default-actions {interface-down;}}maintenance-domain md1 {level 1;maintenance-association ma1 {continuity-check {interval 1s;}mep 100 {interface ge-1/0/5.1;direction down;remote-mep 101 {action-profile myDefault;}}}}}}}}

   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 (...).

   [edit]

   access {...profile ppp-authenticator {...}}