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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 65301.
    Figure 1: Choosing two PEs and specifying the circuit bandwidth Screenshot of VPN setup interface showing L2CC configuration. Bandwidth set to 10M bps, AS number 65301. Selected devices: C_PE_RT01, C_PE_RT02. Navigation buttons: Add, Remove, Back, Next, Cancel, Help.
  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 PEsNetwork configuration interface for adding a VPN with L2 Circuit, showing selected devices C_PE_RT01 and C_PE_RT02, connected by a network link.
  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 Paragon Planner LSP Tunnels Overview. The following figure shows the completed assignments.
    Figure 3: Assigning Transmit/Receive LSPs and EncapsulationNetwork configuration interface for setting up a Layer 2 Circuit Cross-Connect between nodes C_PE_RT01 and C_PE_RT02 with 10M bandwidth.

    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 VPNScreenshot of network management software interface for managing IP VPNs showing Layer 2 CCC VPN circuit L2CCC_1 details including bandwidth, node details, transmit and receive LSP, circuit ID, and encapsulation type. Options for adding, modifying, and highlighting VPN configuration are present.