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anycast address
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... belonging to different nodes). A packet sent to an
anycast address is delivered to one of the interfaces
identified by that address ...
... value identifies an address as a unicast address. Anycast addresses
are taken from the unicast address space, and are not syntactically
...
... Anycast Addresses ...
... interface (typically belonging to different nodes), with the
property that a packet sent to an anycast address is routed to the
"nearest" interface having that address ...
...
Anycast addresses are allocated from the unicast address space, using
any of the defined unicast address ...
... unicast address space, using
any of the defined unicast address formats. Thus, anycast addresses
are syntactically indistinguishable from unicast addresses. When a
...
... unicast address is assigned to more than one interface, thus turning
it into an anycast address, the nodes to which the address is
...
... nodes to which the address is
assigned must be explicitly configured to know that it is an anycast
address.
...
...
For any assigned anycast address, there is a longest address prefix P
that identifies the topological region in which all interfaces ...
... that identifies the topological region in which all interfaces
belonging to that anycast address reside. Within the region
identified by P, each member of the anycast set must be advertised as
...
... "host route"); outside the region identified by P, the anycast
address may be aggregated into the routing advertisement for prefix
...
... the null prefix, i.e., the members of the set may have no topological
locality. In that case, the anycast address must be advertised as a
separate routing entry throughout the entire internet ...
...
One expected use of anycast addresses is to identify the set of
routers belonging to an organization providing internet service ...
... There is little experience with widespread, arbitrary use of internet
anycast addresses, and some known complications and hazards when
using them in their full generality [ANYCST]. Until more experience
...
... has been gained and solutions agreed upon for those problems, the
following restrictions are imposed on IPv6 anycast addresses:
...
... An anycast address must not be assigned to an IPv6 host, that
is, it may be assigned to an IPv6 ...
... Required Anycast Address ...
... prefix which
identifies a specific link. This anycast address is syntactically
the same as a unicast address for an interface ...
... Packets sent to the Subnet-Router anycast address will be delivered
to one router on the subnet ...
... The subnet-router anycast address is intended to be used for
applications where a node needs to communicate with one of a set of
...
... All other Anycast addresses with which the router has been
configured. ...