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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 bandwidthConfiguration interface for adding a Layer 2 VPN connection. Title: Add VPN - L2CC_1. Bandwidth set to 10 Mbps. AS number: 65301. Devices selected: C_PE_RT01, C_PE_RT02. Navigation options available: 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 PEsScreenshot of a network configuration interface for setting up a Layer 2 VPN between PE routers C_PE_RT01 and C_PE_RT02.
  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 configuration interface for L2CCC_1 showing VPN details: 10M bandwidth, nodes C_PE_RT01 and C_PE_RT02, GigabitEthernet 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 for configuring Layer 2 CCC VPN with details like circuit name L2CCC_1, bandwidth 10.000M, nodes C_PE_RT01 and C_PE_RT02, and Ethernet encapsulation.