Ipv6 Routing; Protocol Overview; Extended Address Space; Stateless Autoconfiguration - Dell Z9000 Configuration Manual

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IPv6 Routing

Internet protocol version 6 (IPv6) routing is supported on Dell Networking OS.

NOTE: The IPv6 basic commands are supported on all platforms. However, not all features are

supported on all platforms, nor for all releases. To determine the Dell Networking Operating System

(OS) version supporting which features and platforms, refer to

IPv6 is the successor to IPv4. Due to the rapid growth in internet users and IP addresses, IPv4 is reaching

its maximum usage. IPv6 will eventually replace IPv4 usage to allow for the constant expansion.

This chapter provides a brief description of the differences between IPv4 and IPv6, and the Dell

Networking support of IPv6. This chapter is not intended to be a comprehensive description of IPv6.

IPv6 is an evolution of IPv4. IPv6 is generally installed as an upgrade in devices and operating systems.

Most new devices and operating systems support both IPv4 and IPv6.

Some key changes in IPv6 are:

Header format simplification

Improved support for options and extensions

Extended Address Space

The address format is extended from 32 bits to 128 bits. This not only provides room for all anticipated

needs, it allows for the use of a hierarchical address space structure to optimize global addressing.

Stateless Autoconfiguration

When a booting device comes up in IPv6 and asks for its network prefix, the device can get the prefix (or

prefixes) from an IPv6 router on its link. It can then autoconfigure one or more global IPv6 addresses by

using either the MAC address or a private random number to build its unique IPv6 address.

Stateless autoconfiguration uses three mechanisms for IPv6 address configuration:

Prefix Advertisement — Routers use "Router Advertisement" messages to announce the network

prefix. Hosts then use their interface-identifier MAC address to generate their own valid IPv6 address.

Duplicate Address Detection (DAD) — Before configuring its IPv6 address, an IPv6 host node device

checks whether that address is used anywhere on the network using this mechanism.

Prefix Renumbering — Useful in transparent renumbering of hosts in the network when an

organization changes its service provider.

IPv6 Routing

Implementing IPv6 with Dell