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    Changing a GTP Interface Address

    This procedure describes how to use maintenance mode to halt new sessions from being started and to verify that there are no active sessions remaining before making changes to a GPRS tunneling protocol (GTP) interface address.

    1. Enter configuration mode in the CLI.
      user@host> configure
    2. Activate maintenance mode for a gateway.
      user@host# set unified-edge gateways ggsn-pgw gw-name service-mode maintenance"
    3. Verify that the mobility gateway is in maintenance mode.
      user@host# run show unified-edge ggsn-pgw gateway service-mode

      Note: From the gateway hierarchy, the service mode for the gateway shows Maintenance – Active Phase if all the sessions using this pool are cleared. The service mode for the gateway shows Maintenance – In Phase if there are some sessions actively using this pool.

    4. Verify that there are no subscribers active on this gateway.
      user@host# run show unified-edge ggsn-pgw subscribers gateway gw-name

      Note: If a large number of subscribers will use this gateway, the preceding command will be process intensive, in which case, you can use the following command:

      user@host# run show unified-edge ggsn-pgw status

      This command shows the active contexts across all of the gateway instances.

    5. Verify that there are no outstanding CDRs for the gateway.
      user@host# show unified-edge ggsn-pgw charging transfer status
    6. (Optional) Terminate sessions that are using the gateway and clear CDRs using the following clear commands:
      user@host# run clear unified-edge ggsn-pgw subscribers gateway gw-name
      user@host# run clear unified-edge ggsn-pgw subscribers charging gateway gw-name

      Caution: These clear commands clear all of the existing subscribers on the gateway. Only issue these commands if you intend to disconnect service to all these subscribers.

    7. When the subscriber count is zero, all sessions have ended, and the charging data records (CDRs) are flushed, modify the GTP interface in active maintenance mode.
      user@host# set unified-edge gateways ggsn-pgw gw-name gtp interface interface-name user@host# commit

      Note: These modifications must be made in active maintenance mode or they will fail.

    8. Verify that changes were properly committed.
      user@host# run show configuration unified-edge ggsn-pgw gateway gw-name
    9. Exit maintenance mode and commit.
      user@host# delete unified-edge gateways ggsn-pgw gw-name gateway gw-name service-mode user@host# commit
    10. Return the gateway to operational state.
      user@host# run show unified-edge ggsn-pgw gateway service-mode

    Published: 2011-12-02