Example for Accessing Different LTE Networks Using Dual SIM Cards

Procedure

1. Configure APN profiles.

   # Configure APN profile mainCard and bind it to the master SIM card to connect to LTE network 1. According to the carrier, the APN of LTE network 1 is LTENET1.

   <Huawei> system-view
   [Huawei] sysname Router
   [Router] apn profile mainCard
   [Router-apn-profile-mainCard] sim-id 1
   [Router-apn-profile-mainCard] apn LTENET1
   [Router-apn-profile-mainCard] quit

   # Configure APN profile backupCard and bind it to the backup SIM card to connect to LTE network 2. According to the carrier, the APN of LTE network 2 is LTENET2.

   [Router] apn profile backupCard
   [Router-apn-profile-backupCard] sim-id 2
   [Router-apn-profile-backupCard] apn LTENET2
   [Router-apn-profile-backupCard] quit

2. Configure C-DCC for the dial-up connection on the LTE cellular interface.

   # Configure a dialer control list.

   [Router] dialer-rule
   [Router-dialer-rule] dialer-rule 1 ip permit
   [Router-dialer-rule] quit

   # Configure C-DCC for the dial-up connection on the LTE cellular interface. According to the carrier, the dialer number is *99#.

   [Router] interface cellular 0/0/0
   [Router-Cellular0/0/0] ip address negotiate
   [Router-Cellular0/0/0] mode lte auto
   [Router-Cellular0/0/0] dialer enable-circular
   [Router-Cellular0/0/0] dialer-group 1
   [Router-Cellular0/0/0] dialer timer autodial 20
   [Router-Cellular0/0/0] dialer number *99# autodial

3. Bind the APN profiles to the LTE cellular interface.

   [Router-Cellular0/0/0] apn-profile mainCard priority 150
   [Router-Cellular0/0/0] apn-profile backupCard priority 120
   [Router-Cellular0/0/0] sim switch rssi-threshold 105
   [Router-Cellular0/0/0] sim switch-back enable timer 1440
   [Router-Cellular0/0/0] shutdown
   [Router-Cellular0/0/0] undo shutdown
   [Router-Cellular0/0/0] quit

4. Configure the enterprise intranet.

   # Create VLAN 10 and add Ethernet 2/0/0 to VLAN 10.

   [Router] vlan 10
   [Router-vlan10] quit
   [Router] interface ethernet 2/0/0
   [Router-Ethernet2/0/0] port link-type trunk
   [Router-Ethernet2/0/0] port trunk allow-pass vlan 10
   [Router-Ethernet2/0/0] quit

   # Enable DHCP.

   [Router] dhcp enable

   # Create a global address pool.

   [Router] ip pool ltepool
   [Router-ip-pool-ltepool] network 192.168.100.0 mask 255.255.255.0
   [Router-ip-pool-ltepool] gateway-list 192.168.100.1
   [Router-ip-pool-ltepool] quit

   # Configure the interface to work in global address pool mode.

   [Router] interface vlanif 10
   [Router-Vlanif10] ip address 192.168.100.1 255.255.255.0
   [Router-Vlanif10] dhcp select global
   [Router-Vlanif10] quit

5. Configure the NAT function.

   [Router] acl number 3002
   [Router-acl-adv-3002] rule 5 permit ip source 192.168.100.0 0.0.0.255
   [Router-acl-adv-3002] quit
   [Router] interface cellular 0/0/0
   [Router-Cellular0/0/0] nat outbound 3002
   [Router-Cellular0/0/0] quit

6. Configure a default route and specify Cellular0/0/0 as the outbound interface.

   [Router] ip route-static 0.0.0.0 0 cellular 0/0/0

7. Verify the configuration.

   # After the previous configurations, traffic on the branch intranet is transmitted to LTE network 1 through the master SIM card. If dial-up fails because the account balance of the master SIM card is insufficient, the master SIM card is faulty, the LTE link signal quality is poor, or the connected LTE network is faulty, traffic is automatically switched to the backup SIM card and transmitted to the LTE network 2.