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L2CCC (Circuit Cross-Connect) VPN

Circuit Cross-Connect (IETF draft-kompella-ccc-02.txt), an early Layer 2 VPN technology implemented by Juniper, is still in many production networks today. To configure a L2CCC VPN, the user would perform the following sequence of steps:

  1. First bring up the Add VPN window and select Layer 2 CCC. Then type in a circuit name by filling in the Ckt.Name box (e.g., L2CCC_1).
  2. Click on Next to take you to the screen to select the two PEs. Also assign a bandwidth value for the circuit. The following figure shows a bandwidth of 10M for two chosen routers from AS 57301.
    Figure 1: Choosing two PEs and specifying the circuit bandwidthAdd VPN interface labeled Add VPN - L2CC_1 with sections for Common Properties and Device Selection. Bandwidth set to 10M, AS set to 65301. Available Devices listed on the left, Selected Devices on the right. Includes buttons for adding, removing devices and navigation.
  3. Click on Next to bring up the following window where you would identify PEs and assign the PE facing CE interfaces (in the same manner as described under the L3 (Layer 3) VPN section). The following figure shows the result of the assignment of the interfaces.
    Figure 2: Interfaces assigned to PEsScreenshot of a network tool interface for setting up a Layer 2 VPN between routers C_PE_RT01 and C_PE_RT02 via a green line. The left panel has a network diagram with a cloud icon. The right panel shows a dropdown with AS 65534 and a list of devices. The bottom right lists C_PE_RT02 interfaces with IPs and VRF info. Navigation buttons are at the bottom.
  4. Next, click on the Details tab to specify the Encapsulation, the Transmit LSP, and the Receive LSP. For more information about how to set up LSPs, see NorthStar Planner LSP Tunnels Overview. The following figure shows the completed assignments.
    Figure 3: Assigning Transmit/Receive LSPs and EncapsulationAdd VPN interface for configuring Layer 2 Circuit Cross-Connect with endpoints C_PE_RT01 and C_PE_RT02. Bandwidth 10M. Ethernet encapsulation.

    Note that the Encapsulation drop-down can take on the values as described in the following table.

    Field

    Description

    Encapsulation

    For Juniper, the interface encapsulation types include: aal0, atm-aal5, atm-ccc-vc-mux, atm-cell, atm-cell-port-mode, atm-cell-vc-mode, atm-cell-vp-mode, cisco-hdlc, ethernet, ethernet-vlan, frame, frame-relay, frame-relay-ccc, interworking, and ppp.
  5. Finally, click on Finish to complete the creation of a L2CCC VPN.
    Figure 4: Details of the newly-added L2CCC VPNNetwork management interface showing Layer 2 CCC VPN configuration for L2CCC_1 with nodes C_PE_RT01 and C_PE_RT02 with 10M bandwidth.