An anycast address is a single address assigned to multiple nodes. 

A packet sent to an anycast address is then delivered to the first available NODE. It is for load-balancing and automatic failover.

Several of the DNS root servers use a router-based anycast IMPLEMENTATION, which is really a shared unicast addressing scheme. (While there are only thirteen authoritative root server names, the total number of actual servers is considerably larger, and they are spread all over the globe.) The same IP address is assigned to multiple interfaces, and then multiple routing tables entries are needed to MOVE everything along.

IPv6 anycast addresses contain fields that identify them as anycast, so all you need to do is configure your NETWORK interfaces appropriately. The IPv6 protocol itself takes care of getting the PACKETS to their final destinations.

An anycast address is a single address assigned to multiple nodes. 

A packet sent to an anycast address is then delivered to the first available node. It is for load-balancing and automatic failover.

Several of the DNS root servers use a router-based anycast implementation, which is really a shared unicast addressing scheme. (While there are only thirteen authoritative root server names, the total number of actual servers is considerably larger, and they are spread all over the globe.) The same IP address is assigned to multiple interfaces, and then multiple routing tables entries are needed to move everything along.

IPv6 anycast addresses contain fields that identify them as anycast, so all you need to do is configure your network interfaces appropriately. The IPv6 protocol itself takes care of getting the packets to their final destinations.