Reference Guide

Neighbor Discovery Protocol (NDP) | 1067

Neighbor Discovery Protocol (NDP)

Network Discovery Protocol for IPv6 is supported by FTOS on all Dell Force10

platforms, as indicated by the characters that appear under each of the command

headings:

e E-Series, c C-Series, s S-Series, , or .

Overview

Neighbor Discovery Protocol for IPv6 is defined in RFC 2461 as part of the Stateless

Address Autoconfiguration protocol. It replaces the Address Resolution Protocol

used with IPv4. It defines mechanisms for solving the following problems:

• Router discovery: Hosts can locate routers residing on a link.

• Prefix discovery: Hosts can discover address prefixes for the link.

• Parameter discovery

• Address autoconfiguration — configuration of addresses for an interface

• Address resolution — mapping from IP address to link-layer address

• Next-hop determination

• Neighbor Unreachability Detection (NUD): Determine that a neighbor is no

longer reachable on the link.

• Duplicate Address Detection (DAD): Allow a node to check whether a proposed

address is already in use.

• Redirect: The router can inform a node about a better first-hop.

NDP makes use of the following five ICMPv6 packet types in its implementation:

• Router Solicitation

• Router Advertisement

• Neighbor Solicitation

• Neighbor Advertisement

• Redirect

Commands

The Neighbor Discovery Protocol (NDP) commands in this chapter are:

• clear ipv6 neighbors