What are the differences between a dialer interface and a physical interface

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For C-DCC, a dialer interface may contain multiple physical interfaces, but a physical interface belongs to only one dialer interface and uses one set of dialer parameters.

For RS-DCC, a dialer interface may contain multiple physical interfaces, and a physical interface can belong to multiple dialer interfaces.

Other related questions:
Why is the dialer interface still Up when the physical status of the dialer interface is Down
When the physical interface that is not connected to a cable is Down, the dialer interface displays Snoofing Up. This situation is normal. You can run the dialer number 1 autodial command so that the dialer interface changes as the physical interface.

Internet access is slow after a PPPoE dialup link on an AR router is switched over
Modify the TCP MSS value of the device, and set the state of the Dialer interface protocol after PPPoE dialup fails to Down for link switchover. Example: Modify the TCP MSS value. system-view [Huawei]interface Dialer 1 [Huawei-Dialer1]tcp adjust-mss 1200 Example: Set the state of the Dialer interface protocol after PPPoE dialup fails to Down. system-view [Huawei]interface Dialer 1 [Huawei-Dialer1]dialer number 1 autodial The causes are as follows: The TCP MSS value is used to control the maximum transmission load of TCP packets, and it is determined according to the negotiation between the client and server. Generally, it is set to 1460. Plus 20-byte IP header, 20-byte TCP header, and 8-byte PPPoE header, the MTU of TCP packets is 1508 bytes. However, the MTU of network device interfaces is 1500 bytes generally. Since TCP packets cannot be fragmented (according to DF flag in the IP header of the packets defined in the protocol), they will be discarded. As a result, Internet access slows down. Modify the TCP MSS value to enable the router to join in the MSS value negotiation process, and therefore avoid packet discarding during TCP transmission. The Dialer interface is a virtual service bearing interface of devices, and it is invisible on the device panel. This interface is snooping up, which causes switchover failures if the router attempts to switch over to a normal physical interface after dialup fails. Run the dialer number 1 autodial command to ensure that the state of the interface is Down after dialup fails and the route to the Dialer interface is canceled. Then, link switchover can be implemented.

What are the differences between the E1 interface and the serial interface of an AR router
The differences and relationship between the E1 interface and the serial interface of an AR router are described as follows: The serial interface of an AR router uses the DB9 female connector. It is the physical implementation of the E1 interface and is used transmit data in lines with 2 Mbit/s and lower bandwidth. DB9 male connectors used on PCs are also called serial interfaces in some scenarios. However, these interfaces are used only to connect to the console interface of routers for device debugging.

How do I configure a 3G interface on an AR router
When WCDMA is used, the procedure for configuring a 3G interface is as follows: [Huawei] apn profile 3gprofile //Create an APN profile. [Huawei-apn-profile-3gprofile] apn 3GNET [Huawei-apn-profile-3gprofile] user name 3guser password cipher Password@123 authentication-mode auto [Huawei-apn-profile-3gprofile] quit [Huawei] dialer-rule //Configure a dialer ACL. [Huawei-dialer-rule] dialer-rule 1 ip permit [Huawei-dialer-rule] quit [Huawei] interface cellular 0/0/0 [Huawei-Cellular0/0/0] link-protocol ppp [Huawei-Cellular0/0/0] ip address ppp-negotiate //Configure an IP address through PPP negotiation. [Huawei-Cellular0/0/0] ppp ipcp dns request //Configure a DNS server address through PPP negotiation. [Huawei-Cellular0/0/0] dialer enable-circular //Enable C-DCC. [Huawei-Cellular0/0/0] dialer-group 1 //Associate Cellular0/0/0 to the dialer access group. [Huawei-Cellular0/0/0] dialer number *99# //Configure a dialer number for calling the remote end. [Huawei-Cellular0/0/0] mode wcdma wcdma-precedence //Configure a network connection mode. [Huawei-Cellular0/0/0] apn-profile 3gprofile //Bind the APN profile to the 3G cellular interface. [Huawei-Cellular0/0/0] shutdown [Huawei-Cellular0/0/0] undo shutdown [Huawei-Cellular0/0/0] quit When CDMA2000 is used, the procedure for configuring a 3G interface is as follows: [Huawei] dialer-rule //Configure a dialer ACL. [Huawei-dialer-rule] dialer-rule 1 ip permit [Huawei-dialer-rule] quit [Huawei] interface cellular 0/0/0 [Huawei-Cellular0/0/0] link-protocol ppp [Huawei-Cellular0/0/0] ip address ppp-negotiate //Configure an IP address through PPP negotiation. [Huawei-Cellular0/0/0] ppp ipcp dns request //Configure a DNS server address through PPP negotiation. [Huawei-Cellular0/0/0] dialer enable-circular //Enable C-DCC. [Huawei-Cellular0/0/0] dialer-group 1 //Associate Cellular0/0/0 to the dialer access group. [Huawei-Cellular0/0/0] dialer number #777 //Configure a dialer number for calling the remote end. [Huawei-Cellular0/0/0] mode cdma hybrid //Configure a network reconnection mode. [Huawei-Cellular0/0/0] quit

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