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Neighbor Discovery Protocol (NDP)
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:
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NDP makes use of the following five ICMPv6 packet types in its implementation:
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Commands
The Neighbor Discovery Protocol (NDP) commands in this chapter are:
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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.
Router Solicitation
Router Advertisement
Neighbor Solicitation
Neighbor Advertisement
Redirect
clear ipv6 neighbors
ipv6 nd managed-config-flag
ipv6 nd max-ra-interval
ipv6 nd mtu
ipv6 nd other-config-flag
ipv6 nd prefix
ipv6 nd ra-lifetime
ipv6 nd reachable-time
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