Why is the link-layer protocol status of an Ethernet interface down after PPPoE dial-up is successfully configured on the interface

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After PPPoE dial-up is successfully configured on an Ethernet interface, it is normal that the link-layer protocol status of the Ethernet interface is Down.

Other related questions:
The PPPoE physical interface is Up but the state of the protocol is Down
After a PPPoE dialup, all services are born on the Dialer interface, with corresponding physical interface being Up and protocol being Down, which is normal and does not affect the services and use. Ignore it. A virtual interface is needed for PPPoE dialup to bear all services. Pay attention to the Dialer interface, and the protocol status does not need to be concerned with.

The state of an E1 interface is not Up when the interface interconnects with the peer device
For the problem that the state of an E1 interface of an AR router is not Up when the interface interconnects with other devices, see the troubleshooting guide. For details, access the URL in the right column.

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.

Why the physical interface status of a 3G cellular interface is Down

If the physical status of a 3G cellular interface (cellular interface) is Down, no 3G link is established and data service has not been transmitted yet. That is, no dialup is triggered or dialup fails on the 3G link.

NOTE:

If no dialup is triggered or dialup fails on a 3G link, the physical interface status is still Down even if a 3G data card (3G modem) is installed.


AR router troubleshooting guide: An AR router cannot access the Internet through PPPoE dial-up connections
For the problem that an AR router cannot access the Internet through PPPoE dial-up connections, see the troubleshooting guide. For details, access the URL in the right column.

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