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NE40E V800R010C00 Feature Description - WAN Access 01

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MP Principles

MP Principles


The Multilink protocol bundles multiple PPP links into an MP link to increase link bandwidth and reliability. MP fragments packets exceeding the maximum transmission unit (MTU) and sends these fragments to the PPP peer over the PPP links in the MP-group. The PPP peer then reassembles these fragments into packets and forwards these packets to the network layer. For packets that do not exceed the MTU, MP directly sends these packets over the PPP links in the MP-group to the PPP peer, which in turn forwards these packets to the network layer.


An MP-group interface is dedicated to MP applications. MP is implemented by adding multiple interfaces to an MP-group interface.

MP Link Negotiation Process

Certain MP options, such as the maximum receive reconstructed unit (MRRU) and endpoint discriminator, are determined through Link Control Protocol (LCP) negotiation.

MP negotiation involves:
  • LCP negotiation: Devices on both ends negotiate LCP parameters and check whether they both work in MP mode. If they work in different working modes, LCP negotiation fails.
  • Network Control Protocol (NCP) negotiation: Devices on both ends perform NCP negotiation by using only NCP parameters (such as IP addresses) of the MP-group interfaces but not using the NCP parameters of physical interfaces.
If NCP negotiation succeeds, an MP link is established.


MP provides the following benefits:
  • Increased bandwidth
  • Load balancing
  • Link backup
  • Reduced delay through packet fragmentation
Updated: 2018-07-04

Document ID: EDOC1100027168

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