Configuring CCC Encapsulation for Layer 2 VPNs
You need to specify a circuit cross-connect (CCC) encapsulation type for each PE-router-to-CE-router interface running a Layer 2 VPN. This encapsulation type should match the encapsulation type configured under the routing instance. For information about how to configure the encapsulation type under the routing instance, see Configuring the Local Site on PE Routers in Layer 2 VPNs.
 | Note: A Layer 2 VPN or Layer 2 circuit is not supported if the PE-router-to-P-router interface has VLAN-tagging enabled and uses a nonenhanced Flexible PIC Concentrator (FPC). |
For Layer 2 VPNs, you need to configure the CCC encapsulation on the logical interface. You also need to configure an encapsulation on the physical interface. The physical interface encapsulation does not have to be a CCC encapsulation. However, it should match the logical interface encapsulation. For example, if you configure an ATM CCC encapsulation type on the logical interface, you should configure a compatible ATM encapsulation on the physical interface.
To configure the CCC encapsulation type, include the encapsulation-type statement:
To configure the CCC encapsulation type on the physical interface, include this statement at the following hierarchy levels:
- [edit interfaces interface-name]
- [edit logical-systems logical-system-name interfaces interface-name]
To configure the CCC encapsulation type on the logical interface, include this statement at the following hierarchy levels:
- [edit interfaces interface-name unit logical-unit-number]
- [edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number]
You configure the encapsulation type at the [edit interfaces] hierarchy level differently from the [edit routing-instances] hierarchy level. For example, you specify the encapsulation as frame-relay at the [edit routing-instances] hierarchy level and as frame-relay-ccc at the [edit interfaces] hierarchy level.
You can run both standard Frame Relay and CCC Frame Relay on the same device. If you specify Frame Relay encapsulation (frame-relay-ccc) for the interface, you should also configure the encapsulation at the [edit interfaces interface name unit unit-number] hierarchy level as frame-relay-ccc. Otherwise, the logical interface unit defaults to standard Frame Relay.
For more information about how to configure interfaces and interface encapsulations, see the Junos® OS Network Interfaces.
