Configuring the LTE Mini-PIM as a Backup Interface

 

You can configure the LTE Mini-PIM as a backup interface. If the primary interface fails, the Mini-PIM connects to the network and remains online only until the primary interface becomes functional. The dialer interface is enabled only when the primary interface fails.

Figure 1 illustrates a scenario where the LTE Mini-PIM is installed on a SRX320 Services Gateway and functions as a backup interface. The ge-0/0/1 port is connected to the Internet and functions as the primary interface.

Note

The LTE Mini-PIM can be installed in any of the Mini-PIM slots on the SRX320, SRX340, SRX345, and SRX550M Services Gateways. In this scenario, the Mini-PIM is installed on slot 1.

Figure 1: LTE Mini-PIM Used as a Backup Interface
LTE
Mini-PIM Used as a Backup Interface

To configure the LTE Mini-PIM as a backup interface:

  1. Configure the dialer interface:
    user@host# set interfaces dl0 unit 0 family inet negotiate-address
    user@host# set interfaces dl0 unit 0 family inet6 negotiate-address
    user@host# set interfaces dl0 unit 0 dialer-options pool dialer-pool-number
    user@host# set interfaces dl0 unit 0 dialer-options dial-string dial-number
  2. Configure the dialer pool for the LTE Mini-PIM physical interface:
    user@host# set interfaces cl-1/0/0 dialer-options pool dialer-pool-number
  3. Configure the profile. The Subscriber Identity Module (SIM) uses a profile to establish a connection with the network. You can configure up to 16 profiles for each SIM card. The LTE Mini-PIM supports two SIM cards and so you can configure a total of 32 profiles, although only one profile can be active at a time.
    user@host# run request modem wireless create-profile profile-id profile-id cl-1/0/0 slot sim-slot-number access-point-name l3vpn.corp authentication-method none
    Note

    sim-slot-number is the slot on the Mini-PIM in which the SIM card is inserted.

  4. Verify that the profile is configured successfully:
    user@host# run show modem wireless profiles cl-1/0/0 slot 1
  5. Activate the SIM card:
    user@host# set interfaces cl-1/0/0 act-sim sim-slot-number
  6. Select the profile and configure the radio access type for the SIM card:
    user@host# set interfaces cl-1/0/0 cellular-options sim sim-slot-number select-profile profile-id profile-id
    user@host# set interfaces cl-1/0/0 cellular-options sim sim-slot-number radio-access automatic
    Note

    If a SIM card is installed in the second slot, then select the profile and configure the radio access type for the secondary SIM card as well.

  7. Configure the Ethernet interface as the primary interface, which connects to the wireless network. Configure the dl0 interface as the backup interface.
    user@host# set interfaces ge-0/0/1 unit 0 family inet address 192.168.2.1/24
    user@host# set interfaces ge-0/0/1 unit 0 backup-options interface dl0.0
  8. Verify the status of the wireless network and dialer interface:
    user@host# run show modem wireless network
    user@host# run show interfaces dl0.0
Note

The activation-delay and deactivation-delay command-line options can be used to avoid interface flaps by forcing a delay between the time the primary interface changes states, and the time the dialer interface is enabled or disabled. The activation delay controls the time between the primary interface going down and the activation of the dialer interface. Similarly, the deactivation delay controls the time between the recovery of the primary interface and the deactivation of the backup interface.