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Configuration Guide - VPN 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Configuration Guide - VPN
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(Optional) Configuring an AC Interface to Transparently Transmit TDM Frames/ATM Cells

(Optional) Configuring an AC Interface to Transparently Transmit TDM Frames/ATM Cells

A PW can be configured on an AC interface only after the AC interface has been configured to transparently transmit TDM frames/ATM cells.

Context

Figure 7-4 Networking for multiple TDM/ATM NodeBs connected to an RNC over an IP RAN

Wireless communication services are developing and 2G TDM, 3G ATM, and LTE services will be all transmitted on a bearer network. In addition to wireless services, an IP RAN uses the PWE3 technology to transparently transmit TDM/ATM services, helping operators achieve the most cost efficiency possible.

On the network shown in Figure 7-4, TDM/ATM services are sent to a CSG along E1, CE1, or CPOS links. The CSG sends the TDM/ATM services transparently to an RSG through a PWE3 PW. The RSG forwards these services to an RNC over an E1 link, an CE1 link, or a CPOS link. E1, CE1, or CPOS interfaces are usually channelized into serial interfaces before transmitting upper-layer services. Serial interfaces are slow and cannot provide the 8 to 16 Mbit/s bandwidth needed for 3G RAN services. IMA group interfaces and ATM bundle interfaces are used to provide the required bandwidth and improve transmission resource utilization. In addition, transparent ATM cell transport at different levels is supported for various connections.

On an IP RAN, serial interfaces channelized from E1, CE1, or CPOS interfaces transparently transmit TDM frames. IMA group interfaces and ATM bundle interfaces are often used to forward ATM services from NodeBs to a CSG. Serial interfaces are seldom used because they cannot provide sufficient bandwidth.
  • IMA group interfaces

    An IMA group is a logical link and consists of one or more links. IMA groups provide more bandwidth (approximately equal to the sum of the bandwidths of all members) than a single link. IMA group interfaces are flexible and efficiently use bandwidth resources.

  • ATM bundle interfaces

    ATM bundle interfaces forward one type of service from NodeBs along the same PW to an RNC, reducing the load on the CSG and improving service scalability.

    On the network shown in Figure 7-4, assume that multiple NodeBs are connected to a CSG through E1 or CPOS links. Every NodeB can transmit voice, video, and data services. This requires the CSG to create three PVCs for every NodeB before transmitting voice, video, and data services. If one PW is used to transmit one type of service on each NodeB, a large number of PWs need to be configured on the CSG. The growing number of NodeBs and service types creates an increasing burden on the CSG.

    To address this problem, sub-interfaces transmitting the same type of service on different NodeBs join one ATM bundle interface connecting NodeBs to a CSG. A PW is set up on the ATM bundle interface connecting the CSG to an RNC. This means that each type of service requires one ATM bundle interface and one PW on a CSG, reducing the number of PWs, lessening the burden on the CSG, and improving service scalability.

Procedure

  • Configure a serial interface to transparently transmit TDM frames.

    1. Run system-view

      The system view is displayed.

    2. Run either of the following commands:

      • To enter the view of a serial interface channelized from an E1/CE1 interface, run:

        interface serial controller-number : set-number
      • To enter the view of a serial interface channelized from a CPOS interface, run:
        interface serial controller-number/e1-number : set-number
    3. Run link-protocol tdm

      The TDM protocol is configured as a data link protocol for the serial interface.

      NOTE:

      A serial interface running the TDM protocol does not recognize the valid bytes of received TDM frames. It is futile to view the rate and bandwidth of this serial interface.

    4. Run quit

      Exit the serial interface view.

    5. Run commit

      The configuration is committed.

  • Configure a serial interface or an IMA group interface to transparently transmit ATM cells.

    The L2VPN technology provides five-level simulation services for transparently transmitting ATM cells on serial or IMA group interfaces.

    Transparent Cell Transport Mode AC Interface Usage Scenario

    N-to-1 VCC

    Serial and IMA group sub-interfaces

    VCC: virtual channel connection. A VCC is the basic unit on an ATM network, and transmits various ATM services.

    VPC: virtual path connection. A VPC is a group of VCCs destined for the same address, and transmits various ATM services. If multiple VCCs to the same destination are used, a VPC is more useful than VCCs, because it transmits cells more rapidly than VCCs and is easier to manage and configure.

    In N-to-1 mode, a physical link is divided into multiple PVCs, each of which transmits one type of service, helping implement ATM QoS.

    If a PSN that transmits the ATM services requires high transmission speed, the service traffic is light, you can configure 1-to-1 ATM cell transport.

    1-to-1 VCC

    Serial and IMA group sub-interfaces

    N-to-1 VPC

    Serial and IMA group sub-interfaces

    1-to-1 VPC

    Serial and IMA group sub-interfaces

    1. Run system-view

      The system view is displayed.

    2. Configure ATM cell relay based on the modes and AC interface types listed in the following table.

      Transparent Cell Transport Mode Serial Interface Channelized from an E1/CE1 Interface Serial Interface Channelized from a CPOS Interface IMA Group Interface

      N-to-1 VCC

      1. Run interface serial controller-number:set-number.subnumber p2mpA serial sub-interface is created and the serial sub-interface view is displayed.

      1. Run interface serial controller-number/e1-number:set-number.subnumber p2mpA serial sub-interface is created and the serial sub-interface view is displayed.

      1. Create an IMA group interface and add the serial interface into the IMA group interface. For information about IMA group interface configuration, see Configure an IMA group interface.

      2. Run interface ima-group interface-number.subnumber p2mpAn IMA group sub-interface is created and the IMA group sub-interface view is displayed.

      2. Run pvc vpi/vciA PVC is created and the PVC view is displayed.

      1-to-1 VCC

      1. Run interface serial controller-number:set-number.subnumber p2pA serial sub-interface is created and the serial sub-interface view is displayed.

      1. Run interface serial controller-number/e1-number:set-number.subnumber p2pA serial sub-interface is created and the serial sub-interface view is displayed.

      1. Create an IMA group interface and add the serial interface into the IMA group interface. For information about IMA group interface configuration, see Configure an IMA group interface.

      2. Run interface ima-group interface-number.subnumber p2pAn IMA group sub-interface is created and the IMA group sub-interface view is displayed.

      2. Run pvc vpi/vciA PVC is created and the PVC view is displayed.

      N-to-1 VPC

      1. Run interface serial controller-number:set-number.subnumber p2mpA serial sub-interface is created and the serial sub-interface view is displayed.

      1. Run interface serial controller-number/e1-number:set-number.subnumber p2mpA serial sub-interface is created and the serial sub-interface view is displayed.

      1. Create an IMA group interface and add the serial interface into the IMA group interface. For information about IMA group interface configuration, see Configure an IMA group interface.

      2. Run interface ima-group interface-number.subnumber p2mpAn IMA group sub-interface is created and the IMA group sub-interface view is displayed.

      2. Run pvp vpiA PVP is created and the PVP view is displayed.

      1-to-1 VPC

      1. Run interface serial controller-number:set-number.subnumber p2pA serial sub-interface is created and the serial sub-interface view is displayed.

      1. Run interface serial controller-number/e1-number:set-number.subnumber p2pA serial sub-interface is created and the serial sub-interface view is displayed.

      1. Create an IMA group interface and add the serial interface into the IMA group interface. For information about IMA group interface configuration, see Configure an IMA group interface.

      2. Run interface ima-group interface-number.subnumber p2pAn IMA group sub-interface is created and the IMA group sub-interface view is displayed.

      2. Run pvp vpiA PVP is created and the PVP view is displayed.

      NOTE:
      • N-to-1 ATM cell relay is only supported by P2MP ATM sub-interfaces. 1-to-1 ATM cell relay is only supported by P2P ATM sub-interfaces. ATM interface supports neither N-to-1 nor 1-to-1 ATM cell relay.
      • 1-to-1 ATM cell relay also supports VPI/VCI mapping. PEs on both ends of an ATM link create a PVC or a PVP by using VPI and VCI values equal to those set on the connected CE. The system automatically identifies L2VC connections as the same VC or VP based on VPI and VCI mapping.
    3. Run quit

      Exit the serial or IMA group interface view.

    4. Run commit

      The configuration is committed.

  • Configure an ATM bundle interface to transparently transmit ATM cells.

    1. Configure an ATM bundle interface.

      NOTE:

      Create multiple ATM bundle interfaces and corresponding PWs to transmit various types of services.

      1. Run system-view

        The system view is displayed.

      2. Run interface atm-bundle bundle-id

        An ATM bundle interface is created.

      3. Run quit

        Exit from the ATM bundle interface view.

    2. Add a serial or IMA group sub-interface to the ATM bundle interface.

      1. Run one of the following commands based on the sub-interface type:
      • To enter the view of a sub-interface of a serial interface channelized from E1/CE1 interfaces, run:
        interface serial controller-number : set-number.subinterface-number
      • To enter the view of a sub-interface of a serial interface channelized from CPOS interfaces, run:
        interface serial controller-number/e1-number : set-number.subinterface-number
      • To enter the IMA group sub-interface view, run:
        interface ima-group interface-number.subinterface-number
      NOTE:
      • A serial sub-interface must be configured with a PVC or PVP before joining an ATM bundle interface; otherwise, the serial sub-interface will fail to join an ATM bundle interface.

      • Multiple serial sub-interfaces can join one ATM bundle interface, allowing the same type of services from multiple sources to travel through one PW.

    3. Run atm-bundle bundle-id

      A serial or IMA group sub-interface is added to the ATM bundle interface.

    4. Run quit

      Exit from the serial or IMA group sub-interface view.

    5. Run commit

      The configuration is committed.

  • Configure an IMA group interface.

    1. Create an IMA group interface.
      1. Run system-view

        The system view is displayed.

      2. Run interface ima-group interface-number

        An IMA group interface is created.

      3. Run quit

        Exit from the IMA group interface view.

    2. Add a serial interface to an IMA group interface.
      1. Based on the sub-interface type, run one of the following:
        • To enter the view of a sub-interface of a serial interface channelized from E1/CE1 interfaces, run:
          interface serial controller-number : set-number
        • To enter the view of a sub-interface of a serial interface channelized from CPOS interfaces, run:
          interface serial controller-number/e1-number : set-number
        • To enter the view of a sub-interface of a serial interface channelized from CPOS interfaces, run:
          interface serial controller-number/e1-number : set-number
      2. Run link-protocol atm

        ATM is configured as a data-link-layer protocol for the serial interface.

      3. Run ima ima-group interface-number

        The serial interface is added to the IMA group interface.

      4. Run quit

        Exit the serial interface view.

      5. Run commit

        The configuration is committed.

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Updated: 2019-01-14

Document ID: EDOC1100058925

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