RFC 2770 (rfc2770) - Page 2 of 5
GLOP Addressing in 233/8
Alternative Format: Original Text Document
RFC 2770 GLOP Addressing in 233/8 February 2000
The MALLOC working group is looking at a specific strategy for global
multicast address allocation [MADCAP, MASC]. This experiment will
proceed in parallel. MADCAP may be employed within AS's, if so
desired.
This document proposes an experimental method of statically
allocating multicast addresses with global scope. This experiment
will last for a period of one year, but may be extended as described
in section 6.
2. Address Space
For purposes of the experiment described here, the IANA has allocated
233/8. The remaining 24 bits will be administered in a manner similar
to that described in RFC 1797:
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 233 | 16 bits AS | local bits |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2.1. Example
Consider, for example, AS 5662. Written in binary, left padded with
0s, we get 0001011000011110. Mapping the high order octet to the
second octet of the address, and the low order octet to the third
octet, we get 233.22.30/24.
3. Allocation
As mentioned above, the allocation proposed here follows the RFC 1797
(case 1) allocation scheme, modified as follows: the high order octet
has the value 233, and the next 16 bits are a previously assigned
Autonomous System number (AS), as registered by a network registry
and listed in the RWhois database system. This allows a single /24
per AS.
As was the case with RFC 1797, using the AS number in this way allows
the experiment to get underway quickly in that it automatically
allocates some addresses to each service provider and does not
require a registration step.
3.1. Private AS Space
The address space mapped to the private AS space [RFC 1930] is
reserved for future allocation.
Meyer & Lothberg Experimental