19
CONFIDENTIAL
26-Jan-04
© 2002 Procket Networks, Inc. All rights reserved.
Multicast Addressing
•Administratively Scoped Addresses – rfc2365
•239.0.0.0–239.255.255.255
•Private address space
•Similar to RFC1918 unicast addresses
•Not used for global Internet traffic
•Used to limit “scope” of multicast traffic
•Same addresses may be in use at different locations for different multicast sessions
•Examples
•Site-local scope: 239.253.0.0/16
•Organization-local scope: 239.192.0.0/14
IANA Reserved Addresses
   IANA is the responsible Authority for the assignment of reserved class D addresses.  Other interesting reserved addresses are:
    224.0.0.2   - PIMv1   (ALL-ROUTERS - due to transport in IGMPv1)
    224.0.0.5   - OSPF ALL ROUTERS      (RFC1583)
    224.0.0.6   - OSPF DESIGNATED ROUTERS    (RFC1583)
    224.0.0.9   - RIP2   Routers
    224.0.0.13 - PIMv2
    224.0.1.39 - CISCO-RP-ANNOUNCE     (Auto-RP)
    224.0.1.40 - CISCO-RP-DISCOVERY     (Auto-RP)

“ftp://ftp.isi.edu/in-notes/iana/assignments/multicast-addresses” is the authoritative source for reserved multicast addresses.


Additional Information
   "Administratively Scoped IP Multicast", June 1997, has a good discussion on scoped addresses.  This document is available at:

       “draft-ietf-mboned-admin-ip-space-03.txt”