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    Configuring GTP Services on the Gn Interface

    The following configuration specifies the loopback address on which GTP packets are received for a Gn interface.

    The IP address you specify for a Gn interface must be the same address that is specified for the Gp interface, although the Gn and Gp interfaces can be in different VRFs. In addition, to support mobility across 3G and 4G networks, the Gn IP address must be the same as the S5 and S8 addresses, optionally, with each interface in a different VRF, whether or not these addresses are specified explicitly or implicitly (through inheritance or from a higher level).

    To configure GTP services on a Gn interface for a broadband gateway configured as a GGSN/P-GW:

    1. Configure an IPv4 address on a loopback interface to specify the transport address on which GTP packets on the Gn interface are received.
      [edit unified-edge mobile gateways ggsn-pgw MBG1 gtp gn]user@host# set interface lo0.0 v4-address 10.10.10.1
    2. For tunnel management, configure the maximum number of times that the gateway will attempt to send signaling-request messages to a peer (SGSN or S-GW).
      [edit unified-edge mobile gateways ggsn-pgw MBG1 gtp gn]user@host# set n3-requests 6
    3. For tunnel management, configure the time that the gateway waits before resending a signaling-request message when a response to the request has not been received.
      [edit unified-edge mobile gateways ggsn-pgw MBG1 gtp gn]user@host# set t3-response 8
    4. For path management, configure the maximum number of times that the gateway will attempt to send an echo-request message to a peer (SGSN or S-GW).
      [edit unified-edge mobile gateways ggsn-pgw MBG1 gtp gn]user@host# set echo-n3-requests 6
    5. For path management, configure the time that the gateway waits before resending an echo-request message when an echo response to the echo request is not received.
      [edit unified-edge mobile gateways ggsn-pgw MBG1 gtp gn]user@host# set echo-t3-response 4
    6. For path management, configure the number of seconds that the gateway waits before sending an echo-request message after an echo response is received from the peer.
      [edit unified-edge mobile gateways ggsn-pgw MBG1 gtp gn]user@host# set echo-interval 65
    7. To configure a separate loopback address on which GTP control packets are received for the Gn interface:
      1. Configure an IPv4 address on a loopback interface to specify the transport addresses on which GTP control packets on the Gn interface are received.
        [edit unified-edge mobile gateways ggsn-pgw MBG1 gtp gn control]user@host# set interface lo0.5 v4-address 10.10.10.2

        Note: The path management and tunnel management configuration you specified at the Gn interface level will also apply to GTP control packets unless you configure path management, or tunnel management, or both at the Gn interface control level.

      2. Specify a forwarding class for outbound control packets.
        [edit unified-edge mobile gateways ggsn-pgw MBG1 gtp gn control]user@host# set forwarding-class assured-forwarding
      3. Specify a DSCP value in the IP packet header for outbound control packets.
        [edit unified-edge mobile gateways ggsn-pgw MBG1 gtp gn control]user@host# set dscp-code-point 010110

    Published: 2011-11-17