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    Configuring GTP Services When the S5 and S8 Interfaces Are in Different VRFs

    To configure GTP services on a MobileNext Broadband Gateway configured as a P-GW, you specify a different loopback interface but same IP address for each interface when the S5 and S8 interfaces are in different VRF routing instances.

    To configure GTP services for a broadband gateway configured as a P-GW when the S5 and S8 interfaces are in different VRFs:

    1. Configure the maximum number of peer entries for which the gateway stores statistics collected for deleted peers.
      [edit unified-edge mobile gateways ggsn-pgw pgw-1 gtp]user@host# set peer-history 1000
    2. For tunnel management, configure the maximum number of times that the gateway will attempt to send signaling-request messages to a peer (S-GW).
      [edit unified-edge mobile gateways ggsn-pgw pgw-1 gtp]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 pgw-1 gtp]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 pgw-1 gtp]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 pgw-1 gtp]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 pgw-1 gtp]user@host# set echo-interval 65
    7. Configure a loopback interface and IP address to specify the transport address on which all GTP packets transported on the S5 interface are received.
      [edit unified-edge mobile gateways ggsn-pgw pgw-1 gtp s5]user@host# set interface lo0.1 v4-address 10.10.10.10
    8. Configure a loopback interface and IP address to specify the transport address on which all GTP packets transported on the S8 interface are received.
      [edit unified-edge mobile gateways ggsn-pgw pgw-1 gtp s8]user@host# set interface lo0.2 v4-address 10.10.10.10
    9. Configure security trace options for the gateway:
      1. Specify a name for the file that receives the output of the tracing operation.
        [edit unified-edge mobile gateways ggsn-pgw pgw-1 gtp traceoptions]user@host# set file gtp_log
      2. Configure the maximum size for the trace file.
        [edit unified-edge mobile gateways ggsn-pgw pgw-1 gtp traceoptions]user@host# set size 50m

    Published: 2011-11-17