Configuring Multilink Ppp; Overview - Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010 Configuration Manual

Chapter 9

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 303
Platform Considerations on page 306
References on page 307
Supported MLPPP Features on page 308
Unsupported MLPPP Features on page 312
Before You Configure Static MLPPP on page 312
Configuring Static MLPPP on page 312
Configuring Dynamic MLPPP on page 323
Configuring MLPPP Fragmentation and Reassembly on page 324
Configuring Multiclass MLPPP on page 333
Monitoring MLPPP on page 333
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.
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Overview