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'IANA' ** Downref: Normative reference to an Experimental RFC: RFC 1797 ** Obsolete normative reference: RFC 2374 (Obsoleted by RFC 3587) -- Possible downref: Normative reference to a draft: ref. 'SAP' -- Possible downref: Non-RFC (?) normative reference: ref. 'SS' Summary: 12 errors (**), 0 flaws (~~), 7 warnings (==), 5 comments (--). Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 1 MBONED Working Group David Meyer 2 Internet Draft Cisco Systems 3 Peter Lothberg 4 Sprint 5 Category Experimental 6 draft-ietf-mboned-glop-addressing-00.txt October, 1999 8 GLOP Addressing in 233/8 10 1. Status of this Memo 12 This document is an Internet-Draft and is in full conformance with 13 all provisions of Section 10 of RFC 2026. 15 Internet-Drafts are working documents of the Internet Engineering 16 Task Force (IETF), its areas, and its working groups. Note that 17 other groups may also distribute working documents as Internet- 18 Drafts. 20 Internet-Drafts are draft documents valid for a maximum of six months 21 and may be updated, replaced, or obsoleted by other documents at any 22 time. It is inappropriate to use Internet- Drafts as reference 23 material or to cite them other than as "work in progress." 25 The list of current Internet-Drafts can be accessed at 26 http://www.ietf.org/ietf/1id-abstracts.txt. 28 The list of Internet-Draft Shadow Directories can be accessed at 29 http://www.ietf.org/shadow.html. 31 2. Abstract 33 This describes an experimental policy for use of the class D address 34 space using 233/8 as the experimental statically assigned subset of 35 the class D address space. This new experimental allocation is in 36 addition to those described on [IANA] (e.g. [RFC2365]). 38 This memo is a product of the Multicast Deployment Working Group 39 (MBONED) in the Operations and Management Area of the Internet 40 Engineering Task Force. Submit comments to or 41 the authors. 43 3. Copyright Notice 45 Copyright (C) The Internet Society (1999). All Rights Reserved. 47 4. Problem Statement 49 Multicast addresses have traditionally been allocated by a dynamic 50 mechanism such as SDR [SAP]. However, many current multicast 51 deployment models are not amenable to dynamic allocation. For 52 example, many content aggregators require group addresses which are 53 fixed on a time scale which is not amenable to allocation by a 54 mechanism such as described in [SAP]. Perhaps more seriously, since 55 there isn't general consensus by providers, content aggregators, or 56 application writers as to the allocation mechanism, the Internet is 57 left without a coherent multicast address allocation scheme. 59 The MALLOC working group is looking at a specific strategy for global 60 multicast address allocation [MADCAP, MASC]. This experiment will 61 proceed in parallel. MADCAP may be employed within AS's, if so 62 desired. 64 This document proposes an experimental method of statically 65 allocating multicast addresses with global scope. This experiment 66 will last for a period of one year, but may be extended as described 67 in section 8. 69 5. Address Space 71 For purposes of the experiment described here, the IANA should 72 allocate 233/8. The remaining 24 bits will be administered in a 73 manner similar to that described in RFC1797: 75 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 76 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 77 | 233 | 16 bits AS | local bits | 78 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 80 5.1. Example 82 Consider, for example, AS 5662. Written in binary, left padded with 83 0s, we get 0001011000011110. Mapping the high order octet to the 84 second octet of the address, and the low order octet to the third 85 octet, we get 233.22.30/24. 87 6. Allocation 89 As mentioned above, the allocation proposed here follows the RFC1797 90 (case 1) allocation scheme, modified as follows: the high order octet 91 has the value 233, and the next 16 bits are a previously assigned 92 Autonomous System number (AS), as registered by a network registry 93 and listed in the RWhois database system. This allows a single /24 94 per AS. 96 As was the case with RFC1797, using the AS number in this way allows 97 the experiment to get underway quickly in that it automatically 98 allocates some addresses to each service provider and does not 99 require a registration step. 101 6.1. Private AS Space 103 The address space mapped to the private AS space [RFC1930] is 104 reserved for future allocation. 106 7. Using GLOP Addressing in the Single Source Address Space 108 232/8 has been assigned for use by single source applications [SS]. 109 The AS-based assignment scheme described here can also be used in 110 this space. Note that a site using GLOP assignments in 232/8 should 111 take care when advertising those sources over an inter-domain source 112 advertisement protocol such as MSDP [MSDP]. In particular, the 113 decision to advertise these sources via MSDP can result in visibility 114 via traditional means (e.g., via a shared tree). 116 8. Transition from GLOP to Other Address Allocation Schemes 118 It may not be necessary to transition from the address allocation 119 scheme described here to a more dynamic approach (see, e.g., [MASC]). 120 The reasoning here is that the statically assigned addresses taken 121 from 233/8 may be sufficient for those applications which must have 122 static addressing, and any other addressing can come from either a 123 dynamic mechanism such as [MASC], the administratively scoped address 124 space [RFC2365], or the Single-source address space [SS]. 126 9. Security Considerations 128 The approach described here may have the effect of reduced exposure 129 to denial of space attacks based on dynamic allocation. Further, 130 since dynamic assignment does not cross domain boundaries, well known 131 intra-domain security techniques can be applied. 133 10. IANA Considerations 135 IANA should allocate 233/8 for experimental assignments. This 136 assignment should timeout one year after the assignment is made. The 137 assignment may be renewed at that time. It should be noted that the 138 experiment described here is in the same spirit the experiment 139 described in [RFC1797]. 141 11. Acknowledgments 143 This idea originated with Peter Lothberg's idea that we use the same 144 allocation (AS based) as described in RFC 1797 in the class D address 145 space. Randy Bush and Mark Handley contributed many insightful 146 comments. 148 12. References 150 [MADCAP] B. Patel, et. al., "Multicast Address Dynamic Client 151 Allocation Protocol (MADCAP)", 152 draft-ietf-malloc-madcap-04.txt, Feburay, 1999. 154 [MASC] D. Estrin, et. al., "The Multicast Address-Set Claim 155 (MASC) Protocol", draft-ietf-malloc-masc-01.txt, August, 156 1998. 158 [MSDP] D. Farinacci et. al., "Multicast Source Discovery 159 Protocol (MSDP)" draft-ietf-msdp-spec-01.txt, 1999. 161 [IANA] www.isi.edu/in-notes/iana/assignments/multicast-addresses 163 [RFC1797] IANA, "Class A Subnet Experiment", RFC 1797, April, 164 1995. 166 [RFC1930] J. Hawkinson, et. al., "Guidelines for creation, 167 selection, and registration of an Autonomous System 168 (AS)", RFC1930, March, 1996. 170 [RFC2365] David Meyer, "Administratively Scoped IP Multicast", 171 July, 1998. 173 [RFC2374] R. Hinden, et. al., "An IPv6 Aggregatable Global Unicast 174 Address Format", July, 1998. 176 [SAP] Handley, Mark, "SAP: Session Announcement Protocol", 177 draft-ietf-mmusic-sap-00.txt, November, 1996. 179 [SS] www.isi.edu/in-notes/iana/assignments/single-source-multicast 181 13. Author's Address 183 David Meyer 184 Cisco Systems, Inc. 185 170 W. Tasman Drive 186 San Jose, CA 95134-1706 187 United States 188 EMail: dmm@cisco.com 190 Peter Lothberg 191 Sprint 192 VARESA0104 193 12502 Sunrise Valley Drive 194 Reston VA, 20196 195 Email: roll@sprint.net