3Com Switch 8800 Advanced Software V5 Configuration Guide

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IPV6 BASICS CONFIGURATION
When configuring IPv6 basics, go to these sections for information you are
interested in:
■ “IPv6 Overview” on page 211
■ “Configuring Basic IPv6 Functions” on page 221
■ “Configuring IPv6 NDP” on page 222
■ “Configuring PMTU Discovery” on page 226
■ “Configuring IPv6 TCP Properties” on page 227
■ “Configuring IPv6 FIB-Based Forwarding” on page 228
■ “Configuring Capacity and Update Period of Token Bucket” on page 228
■ “Configuring IPv6 DNS” on page 229
■ “Displaying and Maintaining IPv6 Basics Configuration” on page 230
■ “IPv6 Configuration Examples” on page 231
■ “Troubleshooting IPv6 Basics Configuration” on page 233
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The term "router" in this document refers to a router in a generic sense or an
Ethernet switch running routing protocols.
IPv6 Overview Internet protocol version 6 (IPv6), also called IP next generation (IPng), was
designed by the Internet Engineering Task Force (IETF) as the successor to Internet
protocol version 4 (IPv4). The significant difference between IPv6 and IPv4 is that
IPv6 increases the IP address size from 32 bits to 128 bits.This section covers the
following:
■ “IPv6 Features” on page 211
■ “Introduction to IPv6 Address” on page 213
■ “Introduction to IPv6 Neighbor Discovery Protocol” on page 215
■ “IPv6 PMTU Discovery” on page 219
■ “Introduction to IPv6 DNS” on page 220
■ “Protocols and Standards” on page 220
IPv6 Features Header format simplification
IPv6 cuts down some IPv4 header fields or move them to IPv6 extension headers to
reduce the load of basic IPv6 headers, thus making IPv6 packet handling simple
and improving the forwarding efficiency. Although the IPv6 address size is four
times that of IPv4 addresses, the size of basic IPv6 headers is 40 bytes, and is only
twice that of IPv4 headers (excluding the Options field).