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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 ...
... Global Unicast (everything else)
Anycast addresses are taken from the unicast address spaces (of any
scope) and are not syntactically distinguishable from unicast
addresses ...
... 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 ...
... routing
protocols' measure of distance.
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 ...
... anycast
address.
For any assigned anycast address, there is a longest prefix P of that
address ...
... address that identifies the topological region in which all
interfaces belonging to that anycast address reside. Within the
region identified by P, the anycast address must be maintained as a
...
... interfaces belonging to that anycast address reside. Within the
region identified by P, the anycast address must be maintained as a
separate entry in the routing system (commonly referred to as a "host ...
... host
route"); outside the region identified by P, the anycast address may
be aggregated into the routing entry 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 maintained as a
separate routing entry throughout the entire Internet ...
... unavailable or very restricted.
One expected use of anycast addresses is to identify the set of
routers belonging to an organization providing Internet service ...
... Required Anycast Address ...
... prefix that
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 any one of the
...
... node's unicast and anycast addresses. A Solicited-Node multicast
address is formed by taking the low-order 24 bits ...
... multicast addresses for all unicast and
anycast addresses that have been configured for the node's interfaces
...
...
o Any additional Unicast and Anycast addresses that have been
configured for the node's interfaces ...
... o The Subnet-Router Anycast addresses for all interfaces for which
it is configured to act as a router ...
...
o The restrictions on using IPv6 anycast addresses were removed
because there is now sufficient experience with the use of anycast
addresses ...
... anycast addresses were removed
because there is now sufficient experience with the use of anycast
addresses, the issues are not specific to IPv6, and the GROW
...