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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 bandwidthScreenshot of VPN connection interface labeled Add VPN - L2CC_1. Bandwidth set to 10M and AS number 65301. Selected devices: C_PE_RT01, C_PE_RT02.
  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 VPN with L2CC, showing selected PE routers C_PE_RT01 and C_PE_RT02, device list, and interface details.
  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 L2CCC_1 configuration interface for Layer 2 Circuit Cross-Connect setup between nodes C_PE_RT01 and C_PE_RT02 with 10M bandwidth using 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 VPNScreenshot of network management software interface managing IP VPNs, showing a hierarchical view of VPN types. Layer2 CCC VPN circuit L2CCC_1 is selected, displaying detailed properties like bandwidth, nodes, and LSPs on the right. Options for adding and modifying VPN circuits are available.