Configuring Mlppp Fragmentation And Reassembly; Overview; Application; Supported Configurations - Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual

JunosE 11.2.x Link Layer Configuration Guide

Configuring MLPPP Fragmentation and Reassembly

Overview

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You can configure MLPPP fragmentation and reassembly on a static link interface before
adding the link to a bundle, or in a profile assigned to a dynamic MLPPP interface. You
can also configure fragmentation and reassembly for all current member links in an
MLPPP bundle.
E Series routers support fragmentation and reassembly as part of their MLPPP
implementation. Fragmentation is the process by which a large packet is broken up into
multiple smaller fragments for simultaneous transmission across multiple links of an
MLPPP bundle. Reassembly is the process by which the destination router reassembles
the fragments into the original packets.

Application

You can use MLPPP fragmentation and reassembly to reduce transmission latency. You
can also use the feature to implement a packet-prioritization scheme that allows smaller,
delay-sensitive packets (such as high-priority voice packets) to be interleaved with or
race ahead of larger, delay-insensitive packets (such as low-priority data packets) when
they are transmitted in the network.

Supported Configurations

Table 16 on page 320 lists the static and dynamic MLPPP configurations on E Series routers
that support fragmentation and reassembly.
Table 16: Supported Configurations for MLPPP Fragmentation and
Reassembly
Static MLPPP Configurations
Static MLPPP over ATM 1483 subinterfaces
Static MLPPP over PPPoE over ATM 1483
subinterfaces
Static MLPPP over serial (HDLC) interfaces
–
Static MLPPP over PPPoE over Ethernet

Module Requirements

For a list of the line modules and corresponding I/O modules that support MLPPP
fragmentation and reassembly on ERX7xx models, ERX14xx models, and the ERX310
router, see ERX Module Guide, Appendix A, Module Protocol Support.
Dynamic MLPPP Configurations
Dynamic MLPPP over ATM 1483 subinterfaces
Dynamic MLPPP over PPPoE over ATM 1483
subinterfaces
Dynamic MLPPP over serial (HDLC) interfaces
Dynamic MLPPP over L2TP (on the L2TP network
server)
Dynamic MLPPP over PPPoE over Ethernet
Copyright © 2010, Juniper Networks, Inc.