RFC7346: IPv6 Multicast Address Scopes¶

August 2014
Category: Standards Track
Updates: 4007, 4291

Abstract¶

This document updates the definitions of IPv6 multicast scopes and therefore updates RFCs 4007 and 4291.

1. Introduction¶

Add a new scope: “3| Realm-Local scope”
The multicast protocol specification in [MPL] desires to use multicast scop 3 to transport multicast traffic scoped to a network of nodes connected in a mesh.
This scop value is used to accommodate a multicast scope that is greater than Link-Local but is also automatically determined by the network architecture.

2. Definition of IPv6 Multicast Address Scopes (Updates RFC 4291)¶

更新RFC 4291的scope值(增加scope=3的定义):

+------+--------------------------+
| scop | NAME                     |
+------+--------------------------+
|  0   | Reserved                 |
|  1   | Interface-Local scope    |
|  2   | Link-Local scope         |
|  3   | Realm-Local scope        |
|  4   | Admin-Local scope        |
|  5   | Site-Local scope         |
|  6   | Unassigned               |
|  7   | Unassigned               |
|  8   | Organization-Local scope |
|  9   | Unassigned               |
|  A   | Unassigned               |
|  B   | Unassigned               |
|  C   | Unassigned               |
|  D   | Unassigned               |
|  E   | Global scope             |
|  F   | Reserved                 |
+------+--------------------------+

Interface-Local, Link-Local, and Realm-Local scope boundaries are automatically derived from physical connectivity or other non-multicast-related configurations.
Global scope has no boundary.
The boundaries of all other non-reserved scopes of Admin-Local or larger are administratively configured.
For reserved scopes, the way of configuring their boundaries will be defined when the semantics of the scope are defined.

3. Definition of Realm-Local Scopes¶

The definition of any Realm-Local scope for a particular network technology should be published in an RFC.
Realm-Local Scopes are designed to support multicast communication within specific administrative realms or domains, and provides guidelines for their use and management.

5. Definition of Realm-Local Scope for IEEE 802.15.4¶

When used in an IP-over-IEEE802.15.4 network, scop 3 is defined to include all interfaces sharing a Personal Area Network Identifier (PAN ID).

参考¶

https://www.rfc-editor.org/rfc/rfc7346.html