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Ip fragmentation and reassembly, Ip fragmentation and reassembly overview, Ip fragmentation/reassembly cli commands – Avaya P334T-ML User Manual

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Chapter 12 Avaya P330 Layer 3 Features

152

Avaya P334T-ML User’s Guide

IP Fragmentation and Reassembly

IP Fragmentation and Reassembly Overview

The P330 supports IP Fragmentation and Reassembly. This feature allows the router
to send and receive large IP packets where the underlying data link protocol
constrains MTU (maximum transport unit).
IP fragmentation involves breaking a datagram into a number of pieces that can be
reassembled later. The IP source, destination, identification, total length, and
fragment offset fields, along with the “more” fragment and “don't” fragment flags
in the IP header, are used for IP fragmentation and reassembly.
IP Fragmentation works as follows:

IP packet is divided into fragments

each fragment becomes its own IP packet

each packet has same identifier, source, destination address

fragments are usually not reassembled until final destination

IP Fragmentation/Reassembly CLI Commands

In order to...

Use the following command...

Clear the fragment database and
restore its defaults

clear fragment

Set the maximum number of
fragments that can comprise a
single IP packet

fragment chain

Set the maximum number of
fragmented IP packets, destined for
the router, to reassemble at any
given time

fragment size

Set the maximum number of
seconds to reassemble a
fragmented IP packet destined for
the router.

fragment timeout

Display information regarding
fragmented IP packets that are
destined for the router

show fragment