How to handle the problem that the state of an interface alternates between Up and Down frequently after the PPP protocol negotiation is complete

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This problem occurs because the PPP protocol link detection packets cannot be sent or received properly due to large traffic.

Solution: Run the timer hold 0 command on the interfaces configured with the PPP service to disable the PPP protocol sending link detection packets.

Other related questions:
What can I do if an interface on a PPPoE client frequently alternates between Up and Down states

The possible causes are as follows:

    -The IP address assigned to the interface by the PPPoE server is the same as that of another interface on the PPPoE client.

    Solution: Change the conflicting IP address on the PPPoE client or run the remote address command on the PPPoE server to change the IP address assigned to the interface.

  • -All IP addresses in the address pool on the PPPoE server have been allocated to PPPoE clients and no IP address is available for this interface.

    Solution: Run the network (IP address pool view) command in the IP address pool view on the PPPoE server to expand the IP address range of the IP address pool.


What can I do if an interface goes Up and Down frequently after PPP negotiation succeeds
The cause of this is that Point-to-Point Protocol (PPP) link detection packets cannot be sent and received properly in excessive traffic. To solve the problem, run the timer hold 0 command on the PPP service interface to prevent PPP from sending link detection packets.

The physical state of a serial interface is Up but the protocol state of the interface is Down
For the problem that the physical state of a serial interface is Up but the protocol state of the interface is Down, see the troubleshooting guide. For details, access the URL in the right column.

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.

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