
200 Part Two • IPv6 Protocols
Note: The set of nodes that responds to a single anycast address is
referred to as an anycast group. This term helps emphasize the ways in
which anycast and multicast are similar, even though anycast addresses
can be indistinguishable from unicast.
11.4 IPv6 Anycast Specification
So far, only a few protocol specifications specifically address IPv6 anycast.
Defined as part of the IPv6 addressing architecture in RFC 3513, anycast
addresses are taken from the IPv6 unicast address space and are other-
wise indistinguishable from IPv6 unicast addresses. These are the primary
attributes and rules relating to anycast described in