IPv6 Addressing Configuration
Neighbor Discovery (ND)
Neighbor Discovery (ND)Neighbor Discovery (ND) is the IPv6 equivalent of the IPv4 ARP for layer 2 address resolution, and uses IPv6 ICMP messages to do the following:
■Determine the
■Verify that a neighbor is reachable.
■Track neighbor (local) routers.
Neighbor Discovery enables functions such as the following:
■router and neighbor solicitation and discovery
■detecting address changes for devices on a VLAN
■identifying a replacement for a router or router path that has become unavailable
■duplicate address detection (DAD)
■router advertisement processing
■neighbor reachability
■autoconfiguration of unicast addresses
■resolution of destination addresses
■changes to
■anycast address operation
An instance of Neighbor Discovery is triggered on a device when a new (tentative) or changed IPv6 address is detected. (This includes stateless, stateful, and static address configuration.) ND operates in a