This document is addressed to network operators who are considering
whether to deploy or operate a distributed service using anycast. It
describes the best current practice for doing so, but does not
recommend whether any particular service should or should not be
deployed using anycast.
To distribute a service using anycast, the service is first
associated with a stable set of IP addresses, and reachability to
those addresses is advertised in a routing system from multiple,
independent service nodes. Various techniques for anycast deployment
of services are discussed in [RFC1546], [ISC-TN-2003-1], and
[ISC-TN-2004-1].