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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 bandwidthVPN configuration interface with L2CC settings: Bandwidth set to 10M bps, AS number 65301. Devices selected: C_PE_RT01, C_PE_RT02. Options to add or remove devices.
  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 network configuration interface for adding a VPN with Layer 2 Circuit. Two PE routers, C_PE_RT01 and C_PE_RT02, are linked. Autonomous System number is 65534. Interfaces on C_PE_RT02 are listed with IP details. Navigation buttons include Back, Finish, Cancel, and Help.
  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 EncapsulationNetwork configuration interface for adding Layer 2 Circuit Cross-Connect VPN titled Add VPN - L2CCC_1 showing circuit details like bandwidth 10M, endpoints Node A C_PE_RT01 and Node Z C_PE_RT02, and encapsulation Ethernet. Navigation buttons Back, Finish, Cancel, and Help are present.

    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 a network management interface for configuring Layer 2 CCC VPN L2CCC_1 with 10 Gbps bandwidth between nodes C_PE_RT01 and C_PE_RT02.