Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 
 

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 setting up an L2CC VPN connection. Bandwidth is 10M bps, AS number is 65301. Devices C_PE_RT01 and C_PE_RT02 selected for the circuit.
  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 VPN setup with Layer 2 Circuit Connectivity showing selected devices C_PE_RT01 and C_PE_RT02 connected via a green line. Central diagram displays network topology. Right panel lists available devices with AS number 65534. Bottom right shows C_PE_RT02 interfaces with IP addresses. 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 EncapsulationAdd VPN interface for configuring Layer 2 Circuit Cross-Connect. Displays circuit name L2CCC_1, bandwidth 10M, endpoints C_PE_RT01 and C_PE_RT02, Ethernet encapsulation, and LSP details. Buttons include Back, Finish, Cancel, Help.

    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 interface showing Layer 2 CCC VPN L2CCC_1 details, including summary panel with VPN types, and details panel with Node A C_PE_RT01, Node Z C_PE_RT02, bandwidth 10000 Mbps, and Ethernet encapsulation.