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Neighbor Discovery Protocol (NDP)
The 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. NDP 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 uses the following five ICMPv6 packet types in its implementation:
• Router Solicitation
• Router Advertisement
• Neighbor Solicitation
• Neighbor Advertisement
• Redirect
clear ipv6 neighbors
Delete all entries in the IPv6 neighbor discovery cache or neighbors of a specific interface. Static entries
are not removed using this command.
S4820T
Syntax
clear ipv6 neighbors [vrf vrf-name] [ipv6-address | interface]
Parameters
vrf vrf-name (OPTIONAL) Enter the keyword vrf followed by the name of
the VRF to clear the neighbor corresponding to that VRF.
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Neighbor Discovery Protocol (NDP)