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CHAPTER 9
Configuring Multilink PPP
Overview
Copyright © 2010, Juniper Networks, Inc.
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 299
Platform Considerations on page 302
References on page 303
Supported MLPPP Features on page 304
Unsupported MLPPP Features on page 307
Before You Configure Static MLPPP on page 308
Configuring Static MLPPP on page 308
Configuring Dynamic MLPPP on page 319
Configuring MLPPP Fragmentation and Reassembly on page 320
Configuring Multiclass MLPPP on page 328
Monitoring MLPPP on page 328
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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