The ppp-mp interface of an AR router cannot be connected

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MP problems of AR routers can be located based on the following roadmap:

1. MP interfaces transmit data by packets, which cannot be modified.
2. AR routers only support the binding of interfaces of the same card. If the binding cannot be performed on cards equipped with two E1 interfaces, perform it on cards equipped with eight E1 interfaces.
3. Focus on member interfaces when locating MP interface problems because most MP interface problems are caused by the member interfaces.
4. In products with earlier versions, out-of-order problems occur on MP interfaces, which results in the stalling of videos. Use products with V200R0003 and later versions.

If the state of the E1 interface of an AR router is not Up, check whether the state of the member E1 interface is not Up.
If the E1 interface of an AR router cannot communicate with other devices properly, check whether packet losses occur on the member E1 interface.

Other related questions:
AR router troubleshooting guide: The state of an MP-Group interface cannot be Up
For the problem that the state of an MP-Group interface of an AR router is not Up, see the troubleshooting guide. For details, access the URL in the right column.

Can the E1 interface of an AR router interconnect with MP-group interfaces
The E1 interface of an AR router cannot interconnect with MP-group interfaces. The network works properly only when the configurations of the interfaces on both interconnected ends are consistent.

How to configure the MP-Group of E1 interfaces of AR routers

MP indicates the Multi-Link Point-to-Point Protocol (MLPPP), in which multiple PPP links are bound together. MP binding is often performed in scenarios where a 2 Mbit/s E1 dedicated line cannot meet the service requirements.
MP interfaces transmit data by packets. AR routers only support the binding of interfaces of the same card.

system-view
[Huawei] interface mp-group 0/0/1 //Create an MP-Group interface and enter the view of the interface.
[Huawei-Mp-group0/0/1] undo discriminator //(Optional) Disable the terminal endpoint identifier negotiation function which is enabled by default. You can disable the function when the interface cannot interconnect with the devices of other manufacturers.
[Huawei-Mp-group0/0/1] ip address 192.168.0.1 24 //You can run the ip address ppp-negotiate command to allow the peer end to allocate the IP address generated through PPP negotiation to the interface.
[Huawei-Mp-group0/0/1] interface serial 2/0/0 //Enter the view of the specified physical interfaces (PPP type)
[Huawei-Serial2/0/0] ppp mp mp-group 0/0/1 //Add the physical interface. You can repeat this step to add multiple interfaces.
[Huawei-Serial2/0/0] restart //Restart the related physical interfaces.

Do AR routers support inter-card MP
In V200R005 and earlier versions: The devices do not support inter-card MP. In V200R006 and later versions: The devices support only the MP across interface cards of the same type. 1STM1, 1STM4, 4STM1, 1CPOS-155M, and 1CPOS-155M-W interface cards do not support inter-card MP. 1SA/2SA/8SA, 1E1/T1-M, 2E1/T1-M, 4E1/T1-M, 8E1/T1-M, 1E3/CE3/T3/CT3, 1E1/T1-F, 2E1/T1-F, 4E1/T1-F, 8E1/T1-F, and 1BST interface cards support inter-card MP.

Does the LTE cellular interface support PPP
The LTE cellular interface supports PPP. The following physical interfaces also support PPP: - Synchronous or asynchronous serial interface working in synchronous mode (the interface type is the serial interface) - Async interface working in protocol mode - Serial interfaces formed by CE1/PRI or CT1/PRI interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by CE3 or CT3 interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by E1-F or T1-F interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by E1/T1 channels that are channelized from a CPOS interface, which have the same logical features as synchronous serial interfaces - Cellular interfaces - ISDN BRI interfaces - POS interfaces Note: For LTE cellular interfaces, only the E392 data cards support the link-protocol ppp command.

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