Network discovery (phase 1)

When the node boots up initially, it runs the application load, executes the config file (which is empty), and then checks the BOF to determine if ADP-Hm needs to run. If ADP-Hm is enabled, the ADP-Hm process starts and performs the tasks listed below.

  • The ADP-Hm process initializes the cellular port that uses SIM1 for PDN connectivity using the default PDN profile, which has a blank APN. When the cellular port attempts to connect to the network, it uses this PDN profile. If the carrier requires an APN other than the default in order for the cellular port to connect to the network, the cellular port can learn the correct APN from the network if the carrier supports that capability. If the carrier does not support devices learning the APN but requires an APN other than the default, then the operator must configure a PDN profile at the system level with the correct APN and assign that PDN profile to cellular port 1/1/1. See the 7705 SAR-Hm and SAR-Hmc Interface Configuration Guide for details about configuring a PDN profile and assigning it to a cellular port.

  • After the cellular port connects to the network, ADP-Hm assigns the name pdn1-sim1 to the PDN router interface. The name of the router interface must not change during the ADP-Hm process. The PDN router interface can operate in one of three modes. ADP-Hm uses the dynamic cellular interface IP mode of operation. See Dynamic cellular interface IPv4 mode for more information.

  • The ADP-Hm process creates a loopback interface with a default name for the PDN interface (such as "pdn1-loopback"). No IP address is assigned to the loopback because it is operating in dynamic cellular interface IP mode.

  • The ADP-Hm process uses this loopback interface as the unnumbered interface for the PDN router interface

The CLI output below shows the resulting configuration: 

configure router
        interface "pdn1-loopback"
            loopback
            no shutdown
         exit
        interface "pdn1-sim1" pdn
             port 1/1/1
             unnumbered "pdn1-loopback"
             no shutdown
         exit
    exit
exit

If the LTE network authenticates and accepts the new node onto the network, a default bearer is established and the following information is provided to the node for the APN to which the node connects:

  • the IP address of the cellular interface

  • the DNS server IP addresses

The configuration is not saved. (Phase 2) NSP NFM-P Discovery begins.