Configuring C-DCC for Dial-up Connection

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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Configuring C-DCC for Dial-up Connection

To use LTE cellular interfaces to connect to an LTE network, you must configure circular dial control center (C-DCC) for dial-up connection.

Context

Based on different triggering mode, the LTE link dial-up mode can be classified into the following types:

Automatic dial-up (permanently online)

The DCC attempts to dial the PGW immediately after the device starts. The dialing process does not need to be triggered by data packets. If a connection cannot be established with the PGW, the DCC retries at an interval.

This mode applies to the scenarios in which users are not charged based on traffic or time. For example, if a yearly-package service is used, users are not charged based on link traffic or time within the service duration.
Dial-on-demand (not permanently online; link establishment triggered by traffic)

The device triggers link establishment only when data needs to be transferred. When the time during which no traffic is transmitted on the link exceeds the timeout duration, the device disconnects the link to reduce traffic volume.

This mode applies to the scenarios in which users are charged based on traffic or time. For example, if a traffic-package service is used, users are allowed to use certain traffic within the service duration.

Based on different link-layer protocols used by an LTE link, the LTE link dial-up mode can be classified into the following types:

PPP dial-up: In this mode, PPP is used as the link-layer protocol and the LTE link obtains an IP address through PPP negotiation (configured using the ip address ppp-negotiate command).
WWAN dial-up: In this mode, WWAN is used as the link-layer protocol and the LTE link dynamically obtains an IP address (configured using the ip address negotiate command).

Pre-configuration Tasks

Before configuring C-DCC for dial-up connection, complete the following tasks:

Setting connection parameters of LTE cellular interfaces
Obtaining dialer numbers from the carrier

Procedure

Configure a dialer control list.

This configuration is required for dial-on-demand.
1. Run system-view
  The system view is displayed.
2. Run dialer-rule
  The dialer rule view is displayed.
3. Run dialer-rule dialer-rule-number { acl { acl-number | name acl-name } | ip { deny | permit } | ipv6 { deny | permit } }
  A dialer control list is specified for a dialer access group to define conditions for initiating calls.
4. Run quit
  Return to the system view.
Enable C-DCC.
1. Run interface cellular interface-number
  An LTE cellular or LTE channel interface is created and the interface view is displayed.
  
  When the multi-APN function is configured, the LTE channel interface view is displayed; otherwise, the LTE cellular interface view is displayed.
2. Run dialer enable-circular
  C-DCC is enabled, the dialer number and IP address assigns automatically.
  
  By default, the C-DCC function is disabled on an interface.
3. Run dialer-group group-number
  The dialer access group is configured for the dialer interface.
  
  By default, no dialer group is configured.
  
  Make sure that the value of group-number in the dialer-group command is the same as that of dialer-rule-number in the dialer-rule command.
4. (Optional) Run rssi-threshold rssi-threshold
  The received signal strength indicator (RSSI) threshold is set for successfully establishing LTE links.
  
  By default, an LTE data card does not establish an LTE link based on the RSSI threshold.
Obtain IP addresses.
Run ip address negotiate

The LTE cellular interfaces or LTE channel interfaces are configured to dynamically obtain IP addresses.
Run dialer number dial-number [ autodial ]
A dialer number is configured.

You can obtain the dialer number from the carrier.

The autodial parameter indicates the automatic dial-up mode. By default, the automatic dial-up interval is 300 seconds. You can run the dialer timer autodial command to set the automatic dial-up interval. If the autodial parameter is not specified in the command, the dial-on-demand mode is used.
Run quit
Return to the system view.
Run ip route-static 0.0.0.0 0 { nexthop-address | interface-type interface-number } [ preference preference ]
A default route is configured.

Verifying the Configuration

Run the display cellular interface-number { all | hardware | security | network | profile | radio } command to check information about all call sessions on the LTE data card.

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Updated: 2023-05-18

Document ID: EDOC1100112349

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