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    Configuring GTP Services Overview

    You can configure GPRS tunneling protocol (GTP) services on a MobileNext Broadband Gateway that is configured as a gateway GPRS support node (GGSN), Packet Data Network Gateway (P-GW), or GGSN/P-GW. At minimum, to configure a broadband gateway requires that you specify a loopback address on which GTP packets for the 3GPP interfaces are received. When configured as a GGSN, a broadband gateway uses only the Gn and Gp interfaces. When configured as a P-GW, a broadband gateway uses only S5 and S8 interfaces. When configured as a GGSN/P-GW, the broadband gateway uses all these 3GPP interfaces: Gn, Gp, S5, and S8.

    This topic covers the following:

    GTP-C and GTP-U Path Management

    When you configure a Broadband Gateway, you can specify that GTP-C packets and GTP-U packets are received on different loopback addresses. GTP packets for a GTP-C peer address handle control packets, and GTP packets for a GTP-U peer address handle user (data) packets. Each peer in the GTP path is marked a GTP-C peer or a GTP-U peer, or both.

    Configuring GTP Services at Different Levels on a Broadband Gateway

    When you configure a broadband gateway as a GGSN, P-GW, or GGSN/P-GW, GTP services can be configured at the following levels:

    • Gateway—The mobile gateway appears as a single address, which comprises a loopback interface/IP address pair, and all GTP packets for the broadband gateway are received on this loopback address.

      Note: To specify a single loopback address on which all GTP packets (GTP-C and GTP-U) are received, the Gn, Gp, S5, and S8 interfaces must be configured in the same VRF routing instance.

    • Control plane—GTP-C control (signaling) packets are received on a loopback address.
    • Data plane—GTP-U data packets are received on a loopback address.
    • 3GGP interface—GTP packets transported on the following 3G and 4G interfaces are received on a loopback address:

      • Gn interface—GTP packets on the Gn interface (3G) are received on a single loopback address. Optionally, GTP control or GTP user packets that are transported on the Gn interface also can be received on separate loopback addresses.
      • Gp interface—GTP packets are received on the Gp interface (3G). Optionally, GTP control or user packets that are transported on the Gp interface also can be received on separate loopback addresses.
      • S5 interface—GTP packets are received on the S5 interface (4G). Optionally, GTP control or user packets that are transported on the S5 interface also can be received on separate loopback addresses.
      • S8 interface—GTP packets are received on the S8 interface (4G). Optionally, GTP control or user packets that are transported on the S8 interface also can be received on separate loopback addresses.

    If the Gn, Gp, S5, and S8 interfaces for the broadband gateway are each configured in a different Virtual Routing and Forwarding (VRF) routing instance, you must configure GTP services for each interface separately. In this case, each interface (GN, Gp, S5, and S8) must specify a different loopback interface. In addition, the IP address (that you specify for each loopback interface) must be the same in each VRF because the GTP-C, Mobility Management Entity (MME), and Home Subscriber Server (HSS) applications are not VRF aware and a mobile device could attach from anywhere.

    GTP Services Default Settings

    To configure GTP services with all default settings on a P-GW, you can simply configure the loopback address on which GTP packets are received without explicitly configuring any other GTP statements. The GTP defaults configuration is automatically configured on the broadband gateway at the level that you specify the loopback address. For example, the following configuration statement shows a minimum but complete configuration for enabling GTP services on a P-GW:

    [edit unified-edge mobile gateways ggsn-pgw pgw-1 gtp]user@host# set interface lo0.0 v4-address 10.10.10.1

    Note: If no address is specified for the interface, the broadband gateway uses the default interface IP address, which is configured under interface configuration.

    When you do not explicitly configure path management options for GTP services, the broadband gateway uses the defaults, as described in GTP Path Management Overview.

    When you do not explicitly configure tunnel management options for GTP services, the broadband gateway uses the defaults, as described in GTP Tunnel Management Overview.

    GTP Version Support

    When you configure GTP services on the Broadband Gateway, the type of gateway you configure determines the GTP versions that the broadband gateway supports:

    • A broadband gateway configured as a GGSN supports GTPv0 and GTPv1 packets
    • A broadband gateway configured as a P-GW supports GTPv2 packets
    • A broadband gateway configured as a GGSN/P-GW supports GTPv0, GTPv1, and GTPv2 packets

    Published: 2011-11-17