Example for Configuring LTE Cellular Interfaces as the Primary/Backup Interfaces to Connect to the Internet (Using Two 1LTE-L Interface Cards)

NetEngine AR V300R019 CLI-based Configuration Guide - Interface Management

About This Document
Basic Configuration for Interfaces
- Overview of Interfaces
  - Interface Types
  - Interface Numbering Rules
- Licensing Requirements and Limitations for Basic Interfaces
- Configuring Basic Interface Parameters
- Clearing Interface Traffic Statistics
- FAQ About Basic Interfaces
  - How Do I View and Clear Traffic Statistics on an Interface?
  - How Do I Identify the Virtual Port of the Device?
Ethernet Interface Configuration
- Overview of Ethernet Interfaces
- Licensing Requirements and Limitations for Ethernet Interfaces
- Default Settings for Ethernet Interfaces
- Configuring a Port Group
- Configuring General Attributes of Ethernet Interfaces
- Configuring Layer 2 Ethernet Interfaces
- Configuring Layer 3 Ethernet Interfaces
- Maintaining Ethernet Interfaces
  - Configuring Loopback Detection
  - Clearing Interface Statistics
- Configuration Examples for Ethernet Interfaces
  - Example for Configuring the Auto-Negotiation Rate Range
  - Example for Configuring Interface Isolation
- Troubleshooting Ethernet Interfaces
  - Local and Remote Interfaces Have Different Duplex Modes, Rates, and Negotiation modes
- FAQ About Ethernet Interfaces
Serial Interface Configuration
- Overview of Serial Interfaces
- Licensing Requirements and Limitations for Serial Interfaces
- Application Scenarios for Serial Interfaces
  - Networking Diagram of Synchronous Serial Interfaces
- Default Settings for Serial Interfaces
- Configuring a Synchronous Serial Interface
- Configuring an Asynchronous Serial Interface
- Configuration Examples for Serial Interfaces
  - Example for Configuring Network Interworking by Using Synchronous Serial Interfaces
- FAQ About Serial Interfaces
  - When an SA Card Connects to an E1 Card, the Protocol Status Cannot Become Up. How Do I Solve the Problem?
Async Interface Configuration
- Overview of Async Interfaces
- Licensing Requirements and Limitations for Async Interfaces
- Default Settings for Async Interfaces
- Configuring an Async Interface
CE1/PRI Interface Configuration
- Overview of CE1/PRI Interfaces
- Licensing Requirements and Limitations for CE1/PRI Interfaces
- Application Scenarios for CE1/PRI Interfaces
- Default Settings for CE1/PRI Interfaces
- Configuring CE1/PRI Interface
- Maintaining a CE1/PRI Interface
  - Configuring Loopback Detection
  - Clearing Traffic Statistics on a CE1/PRI Interface
- Troubleshooting CE1/PRI Interfaces
  - CE1/PRI Interface Fails to Communicate with a Serial Interface (V.35DTE/DCE)
  - CE1/PRI Interface Fails to Communicate with an E1-F Interface
CT1/PRI Interface Configuration
- Overview of CT1/PRI Interfaces
- Licensing Requirements and Limitations for CT1/PRI Interfaces
- Application Scenarios for CT1/PRI Interfaces
- Default Settings for CT1/PRI Interfaces
- Configuring a CT1/PRI Interface
  - Configuring a CT1/PRI Interface (CT1 Mode)
  - Configuring a CT1/PRI Interface (PRI Mode)
- Maintaining a CT1/PRI Interface
  - Configuring Loopback Detection
  - Clearing Traffic Statistics on a CT1/PRI Interface
CE3 Interface Configuration
- Overview of CE3 Interfaces
- Licensing Requirements and Limitations for CE3 Interfaces
- Application Scenarios for CE3 Interfaces
- Default Settings for CE3 Interfaces
- Configuring a CE3 Interface to Work in E3 Mode
- Maintaining a CE3 Interface
  - Configuring Loopback Detection
  - Clearing Statistics on a CE3 Interface
E1-F Interface Configuration
- Overview of E1-F Interfaces
- Licensing Requirements and Limitations for E1-F Interfaces
- Application Scenarios for E1-F Interfaces
- Default Settings for E1-F Interfaces
- Configuring an E1-F Interface
  - Configuring an E1-F Interface (Unframed Mode)
  - Configuring an E1-F Interface (Framed Mode)
- Maintaining an E1-F Interface
  - Configuring Loopback Detection
  - Clearing Traffic Statistics on an E1-F Interface
- FAQ About Basic Interfaces
T1-F Interface Configuration
- Overview of T1-F Interfaces
- Licensing Requirements and Limitations for T1-F Interfaces
- Application Scenarios for T1-F Interfaces
- Default Settings for T1-F Interfaces
- Configuring a T1-F Interface
- Maintaining a T1-F Interface
  - Configuring Loopback Detection
  - Clearing Traffic Statistics on a T1-F Interface
E&M Interface Configuration
- Overview of E&M Interfaces
- Understanding E&M Interfaces
- Licensing Requirements and Limitations for E&M Interfaces
- Application Scenarios for E&M Interfaces
- Default Settings for E&M Interfaces
- Configuring Line Attributes for an E&M Interface
- Configuration Examples for E&M Interfaces
  - Example for Configuring E&M Interfaces in the Air Traffic Control Scenario
3G Cellular Interface Configuration
- Overview of 3G Cellular Interfaces
- Licensing Requirements and Limitations for 3G Cellular Interfaces
- Application Scenarios for 3G Cellular Interfaces
- Configuring a 3G Cellular Interface in Compliance with the WCDMA Standard
- Maintaining 3G Cellular Interfaces
- Configuration Examples for 3G Cellular Interfaces
- Troubleshooting 3G Cellular Interfaces
  - Users on a 3G Cellular Interface Fail to Be Authenticated Because the Authentication Configuration Is Incorrect
  - Dial-up Fails After a 3G Cellular Interface Is Configured with a Fixed IP Address in 3G+IPSec Scenario
- FAQ About 3G Cellular Interfaces
LTE Cellular Interface Configuration
- Overview of LTE Cellular Interfaces
- Understanding LTE Cellular Interfaces
- Licensing Requirements and Limitations for LTE Cellular Interfaces
- Application Scenarios for LTE Cellular Interfaces
- Summary of LTE Cellular Interface Configuration Tasks
- Default Settings for LTE Cellular Interfaces
- Setting Connection Parameters of LTE Cellular Interfaces
- Configuring C-DCC for Dial-up Connection
- Configuring PIN Management
- (Optional) Configuring the Function of Receiving and Sending SMS Messages
- (Optional) Configuring the SMS Alarm Function
- Maintaining LTE Cellular Interfaces
- Configuration Examples for LTE Cellular Interfaces
5G Cellular Interface Configuration
- Overview of 5G Cellular Interfaces
- Understanding 5G Cellular Interfaces
- Application Scenarios for 5G Cellular Interfaces
- Licensing Requirements and Limitations for 5G Cellular Interfaces
- Default Settings for 5G Cellular Interfaces
- Setting Connection Parameters for a 5G Cellular Interface
- Configuring Automatic 5G Link Recovery
  - Restarting the 5G Modem to Recover a 5G Link
  - Configuring 5G Link Recovery Based on NQA Test Results
- Configuring SIM Card Security Management
- Configuring the Function of Recording NR Signal Strength Logs
- Maintaining 5G Cellular Interfaces
  - Clearing Statistics on 5G Cellular Interfaces
  - Upgrade a 5G Modem
ISDN BRI Interface Configuration
- Overview of ISDN BRI Interfaces
- Licensing Requirements and Limitations for ISDN BRI Interfaces
- Application Scenarios for ISDN BRI Interfaces
  - Connecting a Router to an ISDN Network Through ISDN BRI Interfaces
- Default Settings for ISDN BRI Interfaces
- Configuring an ISDN BRI Interface
- Maintaining an ISDN BRI Interface
  - Configuring Loopback Detection
  - Clearing Traffic Statistics on an ISDN BRI Interface
POS Interface Configuration
- Overview of POS Interfaces
- Licensing Requirements and Limitations for POS Interfaces
- Default Settings for POS Interfaces
- Configuring a POS Interface
- Maintaining POS Interfaces
  - Configuring Loopback Detection
  - Clearing Interface Statistics
- Configuration Examples for POS Interfaces
  - Example for Setting Physical Parameters of a POS Interface
- Troubleshooting POS Interfaces
  - Different POS Interface Parameter Settings on Both Ends
CPOS Interface Configuration
- Overview of CPOS Interfaces
- Understanding CPOS Interfaces
- Licensing Requirements and Limitations for CPOS Interfaces
- Application Scenarios for CPOS Interfaces
  - Using CPOS Interfaces to Converge E1/T1 Lines
  - Using Optical Fibers or Wavelength Division Multiplexing (WDM) to Connect CPOS Interfaces
- Default Settings for CPOS Interfaces
- Configuring CPOS Interfaces to Connect Devices
- Configuring CPOS Interfaces to Converge E1 Lines
- Configuring CPOS Interfaces to Converge T1 Lines
- Maintaining CPOS Interface Configuration
  - Performing Loopback on a CPOS Interface
  - Clearing CPOS Interface Statistics
- Configuration Examples for CPOS Interfaces
- Troubleshooting CPOS Interfaces
  - The Physical Status of an E1 Channel Is Up and the Link Protocol Status Is Down, and a Line Loopback Is Detected
  - Two Routers Are Connected Through CPOS Interfaces, but the Link Layer Status of the Logical Channel Keeps Alternating Between Up and Down
ADSL Interface Configuration
- Overview of ADSL Interfaces
- Licensing Requirements and Limitations for ADSL Interfaces
- Understanding ADSL Interfaces
- Default Settings for ADSL Interfaces
- Configuring an ADSL Interface
- Configuration Examples for ADSL Interfaces
  - Example for Configuring an ADSL Interface
VDSL Interface Configuration
- Overview of VDSL Interfaces
- Licensing Requirements and Limitations for VDSL Interfaces
- Understanding VDSL Interfaces
- Default Settings for VDSL Interfaces
- Configuring a VDSL Interface in ATM Mode
- Configuring a VDSL Interface in PTM Mode
- Configuration Examples for VDSL Interfaces
  - Example for Connecting a VDSL Interface Working in ATM Mode to the Internet
G.SHDSL Interface Configuration
- Overview of G.SHDSL Interfaces
- Licensing Requirements and Limitations for G.SHDSL Interfaces
- Default Settings for G.SHDSL Interface
- Setting Uplink Parameters for a G.SHDSL Interface
- Configuration Examples for G.SHDSL Interfaces
  - Example for Configuring G.SHDSL Interfaces
- FAQ About G.SHDSL Interfaces
  - How Do I Solve the G.SHDSL Card Failure Problem?
IMA Configuration
- Overview of IMA
- Licensing Requirements and Limitations for IMA
- Default Settings for IMA
- Configuring IMA
  - Configuring an E1-IMA Interface
  - Configuring an IMA Group
- Configuration Examples for IMA
  - Example for Configuring an IMA Group
PON Interface Configuration
- Overview of PON Interfaces
- Understanding PON Interfaces
  - Upstream and Downstream Transmission
  - EPON and GPON
- Licensing Requirements and Limitations for PON Interfaces
- Default Settings for PON Interfaces
- Configuring Attributes of an EPON Interface
- Configuring Attributes of a GPON Interface
- Maintaining PON Interfaces
  - Clearing Traffic Statistics on a PON Interface
Logical Interface Configuration
- Overview of Logical Interfaces
- Default Settings for Logical Interfaces
- Licensing Requirements and Limitations for Logical Interfaces
- Configuring a Logical Interface
- Configuration Examples for Logical Interfaces
  - Example for Configuring FR Sub-Interfaces
  - Example for Configuring the Loopback Interface's IP Address to Be Borrowed

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Example for Configuring LTE Cellular Interfaces as the Primary/Backup Interfaces to Connect to the Internet (Using Two 1LTE-L Interface Cards)

Networking Requirements

A remote branch of the enterprise needs to exchange large volumes of service traffic with external networks, but it cannot obtain the wired WAN access service. As shown in Figure 12-13, the branch uses RouterA as the egress gateway and uses LTE cellular interface Cellular1/0/0 to connect to the Internet through LTE network 1, meeting service transmission requirements.

The enterprise leases a link connected to the Internet through LTE network 2 as the backup link, so the backup link can transmit services when Cellular1/0/0 or LTE network 1 is faulty.

In this example:

For LTE network 1, the connection mode is LTE, the APN is ltenet1, and the dialer number is *99#.
For LTE network 2, the connection mode is AUTO, the APN is ltenet2, and the dialer number is *98#.

Set the connection parameters based on the site requirements from the carrier.

Figure 12-13 Networking diagram for configuring LTE cellular interfaces as the primary/backup interfaces to connect to the Internet

Configuration Roadmap

The configuration roadmap is as follows:

Configure Cellular1/0/0 on RouterA to connect RouterA to the Internet through LTE network 1.
Configure Cellular2/0/0 on RouterA to connect RouterA to the Internet through LTE network 2.
Configure Cellular2/0/0 as the backup interface of Cellular1/0/0 so that traffic can be switched to Cellular2/0/0 when Cellular1/0/0 is faulty.
Configure C-DCC to dial up to the Internet through the primary or backup link.
Configure a static route for communication at the network layer.

Procedure

Configure Cellular1/0/0.

# Create an APN profile.

<Huawei> system-view
[Huawei] sysname RouterA
[RouterA] apn profile ltenet1
[RouterA-apn-profile-ltenet1] quit

# Obtain IP addresses dynamically.

[RouterA] interface cellular 1/0/0
[RouterA-Cellular1/0/0] ip address negotiate

# Configure a network connection mode.

[RouterA-Cellular1/0/0] mode lte lte-only

# Bind the APN profile to Cellular1/0/0.

[RouterA-Cellular1/0/0] dialer enable-circular
[RouterA-Cellular1/0/0] apn-profile ltenet1
[RouterA-Cellular1/0/0] shutdown
[RouterA-Cellular1/0/0] undo shutdown
[RouterA-Cellular1/0/0] quit

Configure Cellular2/0/0.

# Create an APN profile.

[RouterA] apn profile ltenet2
[RouterA-apn-profile-ltenet2] quit

# Obtain IP addresses dynamically.

[RouterA] interface cellular 2/0/0
[RouterA-Cellular2/0/0] ip address negotiate

# Configure a network connection mode.

[RouterA-Cellular2/0/0] mode lte auto

# Bind the APN profile to Cellular2/0/0.

[RouterA-Cellular2/0/0] dialer enable-circular
[RouterA-Cellular2/0/0] apn-profile ltenet2
[RouterA-Cellular2/0/0] shutdown
[RouterA-Cellular2/0/0] undo shutdown
[RouterA-Cellular2/0/0] quit

Configure Cellular2/0/0 as the backup interface of Cellular1/0/0.

[RouterA] interface cellular 1/0/0
[RouterA-Cellular1/0/0] standby interface cellular 2/0/0
[RouterA-Cellular1/0/0] quit

Configure C-DCC.

# Create dialer access group 1 and configure a dialer rule in the group.

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

# Enable C-DCC on Cellular1/0/0.

[RouterA] interface cellular 1/0/0
[RouterA-Cellular1/0/0] dialer-group 1
[RouterA-Cellular1/0/0] dialer timer autodial 60
[RouterA-Cellular1/0/0] dialer number *99# autodial
[RouterA-Cellular1/0/0] quit

# Enable C-DCC on Cellular2/0/0.

[RouterA] interface cellular 2/0/0
[RouterA-Cellular2/0/0] dialer-group 1
[RouterA-Cellular2/0/0] dialer timer autodial 60
[RouterA-Cellular2/0/0] dialer number *98# autodial
[RouterA-Cellular2/0/0] quit

Configure a static route.

[RouterA] ip route-static 0.0.0.0 0.0.0.0 cellular 1/0/0 preference 40
[RouterA] ip route-static 0.0.0.0 0.0.0.0 cellular 2/0/0 preference 80

Verify the configuration.

# After the configuration is complete, run the display standby state command on RouterA to check the status of the primary and backup interfaces. The command output shows that Cellular1/0/0 is in Up state and Cellular2/0/0 is in Standby state.

[RouterA] display standby state
Interface                  Interfacestate Backupstate Backupflag Pri   Loadstate
Cellular1/0/0                          UP         MUP       MU            
Cellular2/0/0                     STANDBY     STANDBY      BU     0   
                                                                                
 Backup-flag meaning:                                                           
 M---MAIN  B---BACKUP     V---MOVED    U---USED                                 
 D---LOAD  P---PULLED                           
                                                                                
                                                                                
----------------------------------------------------------------------------    
Below is track BFD information:                                                 
Bfd-Name              Bfd-State  BackupInterface            State               
                                                                                
----------------------------------------------------------------------------    
Below is track IP route information:                                            
Destination/Mask          Route-State  BackupInterface            State         
                                                                                
----------------------------------------------------------------------------    
Below is track NQA Information:                                                 
Instance Name                    BackupInterface              State

# Run the shutdown command on Cellular1/0/0 to simulate a link fault. Run the display standby state command on RouterA to check the status of the primary and backup interfaces. The command output shows that Cellular1/0/0 is in Down state and Cellular2/0/0 is in Up state, indicating that the backup interface has started.

[RouterA-Cellular1/0/0] shutdown
[RouterA-Cellular1/0/0] quit    
[RouterA] display standby state
Interface                  Interfacestate Backupstate Backupflag Pri   Loadstate
Cellular1/0/0                        DOWN      MDOWN          MU        
Cellular2/0/0                          UP         UP          BU  0     
                                                                                
 Backup-flag meaning:                                                           
 M---MAIN  B---BACKUP     V---MOVED    U---USED                                 
 D---LOAD  P---PULLED                           
                                                                                
                                                                                
----------------------------------------------------------------------------    
Below is track BFD information:                                                 
Bfd-Name              Bfd-State  BackupInterface            State               
                                                                                
----------------------------------------------------------------------------    
Below is track IP route information:                                            
Destination/Mask          Route-State  BackupInterface            State         
                                                                                
----------------------------------------------------------------------------    
Below is track NQA Information:                                                 
Instance Name                    BackupInterface              State

Configuration Files

Configuration file of RouterA

#                                                                               
sysname RouterA    
#
apn profile ltenet1
apn profile ltenet2
#
interface Cellular1/0/0          
 dialer enable-circular          
 dialer-group 1                  
 apn-profile ltenet1
 dialer timer autodial 60        
 dialer number *99# autodial     
 stanby interface Cellular2/0/0
 modem auto-recovery dial action modem-rebootfail-times 128
 modem auto-recovery services-unavailable action modem-reboot test-times 0 interval 3600
 ip address negotiate        
#
interface Cellular2/0/0         
 dialer enable-circular         
 dialer-group 1                 
 apn-profile ltenet2
 dialer timer autodial 60            
 dialer number *98# autodial
 modem auto-recovery dial action modem-rebootfail-times 128
 modem auto-recovery services-unavailable action modem-reboot test-times 0 interval 3600
 ip address negotiate       
#                                                                               
dialer-rule                                                                     
 dialer-rule 1 ip permit  
#                                                                               
 ip route-static 0.0.0.0 0.0.0.0 Cellular1/0/0 preference 40                                 
 ip route-static 0.0.0.0 0.0.0.0 Cellular2/0/0 preference 80                       
#
return

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Updated: 2023-05-18

Document ID: EDOC1100112349

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