Configuring Multilink Ppp; Overview - Juniper JUNOSE SOFTWARE 11.0.X - LINK LAYER CONFIGURATION GUIDE 4-1-2010 Configuration Manual

Chapter 8

Configuring Multilink PPP

Overview

This chapter describes how to configure a Multilink Point-to-Point Protocol (PPP)
interface on E Series routers.
This chapter contains the following sections:
Overview on page 267
Platform Considerations on page 270
References on page 271
Supported MLPPP Features on page 272
Unsupported MLPPP Features on page 276
Before You Configure Static MLPPP on page 276
Configuring Static MLPPP on page 276
Configuring Dynamic MLPPP on page 287
Configuring MLPPP Fragmentation and Reassembly on page 288
Monitoring MLPPP on page 297
Multilink PPP (MLPPP; also referred to as PPP Multilink, MLP, and MP) aggregates
multiple physical links into a single logical bundle. More specifically, MLPPP bundles
multiple link-layer channels into a single network-layer channel. Peers negotiate
MLPPP during the initial phase of Link Control Protocol (LCP) option negotiation.
Each router indicates that it is multilink capable by sending the multilink option as
part of its initial LCP configuration request.
An MLPPP bundle can consist of multiple physical links of the same type such as
multiple asynchronous lines or can consist of physical links of different types such
as leased synchronous lines and dial-up asynchronous lines.
The router acts on MLPPP like another PPP Network Control Protocol (NCP). Packets
received with an MLPPP header are subject to fragmentation, reassembly, and
sequencing. Packets received without the MLPPP header cannot be sequenced and
can be delivered only on a first-come, first-served basis.
267
Overview