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    GTP Tunnel Management Overview

    GTP-C controls and manages tunnels for the nodes connecting to the network in order to establish the user data path. A GTP tunnel is used to deliver packets between the P-GW and S-GW, and is identified in each node by a tunnel endpoint identifier (TEID), an IP address, and a UDP port number. Tunnel management involves creating and deleting end-user sessions and creating, modifying, and deleting bearers during the time a user is connected and using network services.

    This tunnel management topic covers:

    GTP Tunnel Management Functions

    A broadband gateway provides the following tunnel management functions to manage the GTP tunnel between a GGSN and SGSN or a P-GW and S-GW:

    • Send Update bearer request to all peers identified in the Peer Information table.
    • Send Delete bearer request to all peers identified in the Peer Information table.
    • Send Delete Session request to all peers identified in the Peer Information table.

    Default Tunnel Management Configuration

    When you configure a broadband gateway as a P-GW, the tunnel management options are automatically enabled with the following default values:

    • n3-requests—Specifies the maximum number of times that the gateway attempts to send a Create/Update/Delete tunnel request message. The default is 3 times.
    • t3-response—Specifies the number of seconds that the gateway waits for a Create/Update/Delete tunnel response from a peer gateway before retransmitting a Create/Update/Delete tunnel request message. The default is 5 seconds.

    GTP Version Support for Tunnel Management Requests and Responses

    Create/update/delete tunnel requests are sent to the peer using the GTP version that the peer supports. A broadband gateway configured as a P-GW supports sending Create/Update/Delete responses to GTPv0, GTPv1, and GTPv2 requests from a peer S-GW.

    Published: 2011-11-17