PPP and MP introduction

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The Point-to-Point Protocol (PPP) is a link-layer protocol proposed by the Internet Engineering Task Force (IETF) for point-to-point links.
If the bandwidth of a synchronous serial interface does not meet requirements, you can use Multilink PPP (MP) to bundle multiple synchronous serial interfaces into one interface to increase bandwidth.

Other related questions:
The ppp-mp interface of an AR router cannot be connected
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.

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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