draft-ietf-mboned-glop-addressing-01.txt   rfc2770.txt 
MBONED Working Group David Meyer
Internet Draft Cisco Systems
Peter Lothberg
Sprint
Category Experimental
draft-ietf-mboned-glop-addressing-01.txt November, 1999
GLOP Addressing in 233/8 Network Working Group D. Meyer
Request for Comments: 2770 Cisco Systems
1. Status of this Memo Category: Experimental P. Lothberg
Sprint
February 2000
This document is an Internet-Draft and is in full conformance with GLOP Addressing in 233/8
all provisions of Section 10 of RFC 2026.
Internet-Drafts are working documents of the Internet Engineering Status of this Memo
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
Internet-Drafts are draft documents valid for a maximum of six months This memo defines an Experimental Protocol for the Internet
and may be updated, replaced, or obsoleted by other documents at any community. It does not specify an Internet standard of any kind.
time. It is inappropriate to use Internet- Drafts as reference Discussion and suggestions for improvement are requested.
material or to cite them other than as "work in progress." Distribution of this memo is unlimited.
The list of current Internet-Drafts can be accessed at Copyright Notice
http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at Copyright (C) The Internet Society (2000). All Rights Reserved.
http://www.ietf.org/shadow.html.
2. Abstract Abstract
This describes an experimental policy for use of the class D address This describes an experimental policy for use of the class D address
space using 233/8 as the experimental statically assigned subset of space using 233/8 as the experimental statically assigned subset of
the class D address space. This new experimental allocation is in the class D address space. This new experimental allocation is in
addition to those described on [IANA] (e.g. [RFC2365]). addition to those described on [IANA] (e.g. [RFC2365]).
This memo is a product of the Multicast Deployment Working Group This memo is a product of the Multicast Deployment Working Group
(MBONED) in the Operations and Management Area of the Internet (MBONED) in the Operations and Management Area of the Internet
Engineering Task Force. Submit comments to <mboned@ns.uoregon.edu> or Engineering Task Force. Submit comments to <mboned@ns.uoregon.edu> or
the authors. the authors.
3. Copyright Notice 1. Problem Statement
Copyright (C) The Internet Society (1999). All Rights Reserved.
4. Problem Statement
Multicast addresses have traditionally been allocated by a dynamic Multicast addresses have traditionally been allocated by a dynamic
mechanism such as SDR [SAP]. However, many current multicast mechanism such as SDR [SAP]. However, many current multicast
deployment models are not amenable to dynamic allocation. For deployment models are not amenable to dynamic allocation. For
example, many content aggregators require group addresses which are example, many content aggregators require group addresses which are
fixed on a time scale which is not amenable to allocation by a fixed on a time scale which is not amenable to allocation by a
mechanism such as described in [SAP]. Perhaps more seriously, since mechanism such as described in [SAP]. Perhaps more seriously, since
there isn't general consensus by providers, content aggregators, or there isn't general consensus by providers, content aggregators, or
application writers as to the allocation mechanism, the Internet is application writers as to the allocation mechanism, the Internet is
left without a coherent multicast address allocation scheme. left without a coherent multicast address allocation scheme.
The MALLOC working group is looking at a specific strategy for global The MALLOC working group is looking at a specific strategy for global
multicast address allocation [MADCAP, MASC]. This experiment will multicast address allocation [MADCAP, MASC]. This experiment will
proceed in parallel. MADCAP may be employed within AS's, if so proceed in parallel. MADCAP may be employed within AS's, if so
desired. desired.
This document proposes an experimental method of statically This document proposes an experimental method of statically
allocating multicast addresses with global scope. This experiment allocating multicast addresses with global scope. This experiment
will last for a period of one year, but may be extended as described will last for a period of one year, but may be extended as described
in section 8. in section 6.
5. Address Space 2. Address Space
For purposes of the experiment described here, the IANA should For purposes of the experiment described here, the IANA has allocated
allocate 233/8. The remaining 24 bits will be administered in a 233/8. The remaining 24 bits will be administered in a manner similar
manner similar to that described in RFC1797: 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 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 | | 233 | 16 bits AS | local bits |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5.1. Example 2.1. Example
Consider, for example, AS 5662. Written in binary, left padded with Consider, for example, AS 5662. Written in binary, left padded with
0s, we get 0001011000011110. Mapping the high order octet to the 0s, we get 0001011000011110. Mapping the high order octet to the
second octet of the address, and the low order octet to the third second octet of the address, and the low order octet to the third
octet, we get 233.22.30/24. octet, we get 233.22.30/24.
6. Allocation 3. Allocation
As mentioned above, the allocation proposed here follows the RFC1797 As mentioned above, the allocation proposed here follows the RFC 1797
(case 1) allocation scheme, modified as follows: the high order octet (case 1) allocation scheme, modified as follows: the high order octet
has the value 233, and the next 16 bits are a previously assigned has the value 233, and the next 16 bits are a previously assigned
Autonomous System number (AS), as registered by a network registry Autonomous System number (AS), as registered by a network registry
and listed in the RWhois database system. This allows a single /24 and listed in the RWhois database system. This allows a single /24
per AS. per AS.
As was the case with RFC1797, using the AS number in this way allows 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 the experiment to get underway quickly in that it automatically
allocates some addresses to each service provider and does not allocates some addresses to each service provider and does not
require a registration step. require a registration step.
6.1. Private AS Space 3.1. Private AS Space
The address space mapped to the private AS space [RFC1930] is The address space mapped to the private AS space [RFC1930] is
reserved for future allocation. reserved for future allocation.
7. Using GLOP Addressing in the Single Source Address Space 4. Transition from GLOP to Other Address Allocation Schemes
232/8 has been assigned for use by single source applications [SS].
The AS-based assignment scheme described here can also be used in
this space. Note that a site using GLOP assignments in 232/8 should
take care when advertising those sources over an inter-domain source
advertisement protocol such as MSDP [MSDP]. In particular, the
decision to advertise these sources via MSDP can result in visibility
via traditional means (e.g., via a shared tree).
8. Transition from GLOP to Other Address Allocation Schemes
It may not be necessary to transition from the address allocation It may not be necessary to transition from the address allocation
scheme described here to a more dynamic approach (see, e.g., [MASC]). scheme described here to a more dynamic approach (see, e.g., [MASC]).
The reasoning here is that the statically assigned addresses taken The reasoning here is that the statically assigned addresses taken
from 233/8 may be sufficient for those applications which must have from 233/8 may be sufficient for those applications which must have
static addressing, and any other addressing can come from either a static addressing, and any other addressing can come from either a
dynamic mechanism such as [MASC], the administratively scoped address dynamic mechanism such as [MASC], the administratively scoped address
space [RFC2365], or the Single-source address space [SS]. space [RFC2365], or the Single-source address space [SS].
9. Security Considerations 5. Security Considerations
The approach described here may have the effect of reduced exposure The approach described here may have the effect of reduced exposure
to denial of space attacks based on dynamic allocation. Further, to denial of space attacks based on dynamic allocation. Further,
since dynamic assignment does not cross domain boundaries, well known since dynamic assignment does not cross domain boundaries, well known
intra-domain security techniques can be applied. intra-domain security techniques can be applied.
10. IANA Considerations 6. IANA Considerations
IANA should allocate 233/8 for experimental assignments. This IANA has allocated 233/8 for experimental assignments. This
assignment should timeout one year after the assignment is made. The assignment should timeout one year after the assignment is made. The
assignment may be renewed at that time. It should be noted that the assignment may be renewed at that time. It should be noted that the
experiment described here is in the same spirit the experiment experiment described here is in the same spirit the experiment
described in [RFC1797]. described in [RFC1797].
11. Acknowledgments 7. Acknowledgments
This idea originated with Peter Lothberg's idea that we use the same This idea originated with Peter Lothberg's idea that we use the same
allocation (AS based) as described in RFC 1797 in the class D address allocation (AS based) as described in RFC 1797 in the class D address
space. Randy Bush and Mark Handley contributed many insightful space. Randy Bush and Mark Handley contributed many insightful
comments. comments.
12. References 8. References
[MADCAP] B. Patel, et. al., "Multicast Address Dynamic Client [RFC2730] Hanna, S., Patel, B. and M. Shah, "Multicast Address
Allocation Protocol (MADCAP)", Dynamic Client Allocation Protocol (MADCAP)", RFC 2730,
draft-ietf-malloc-madcap-04.txt, Feburay, 1999. December 1999.
[MASC] D. Estrin, et. al., "The Multicast Address-Set Claim [MASC] D. Estrin, et al., "The Multicast Address-Set Claim (MASC)
(MASC) Protocol", draft-ietf-malloc-masc-01.txt, August, Protocol", Work in Progress.
1998.
[MSDP] D. Farinacci et. al., "Multicast Source Discovery [MSDP] D. Farinacci et al., "Multicast Source Discovery Protocol
Protocol (MSDP)" draft-ietf-msdp-spec-01.txt, 1999. (MSDP)", Work in Progress.
[IANA] www.isi.edu/in-notes/iana/assignments/multicast-addresses [IANA] www.isi.edu/in-notes/iana/assignments/multicast-addresses
[RFC1797] IANA, "Class A Subnet Experiment", RFC 1797, April, [RFC1797] IANA, "Class A Subnet Experiment", RFC 1797, April 1995.
1995.
[RFC1930] J. Hawkinson, et. al., "Guidelines for creation, [RFC1930] Hawkinson, J. and T. Bates, "Guidelines for creation,
selection, and registration of an Autonomous System selection, and registration of an Autonomous System (AS)",
(AS)", RFC1930, March, 1996. RFC 1930, March 1996.
[RFC2365] David Meyer, "Administratively Scoped IP Multicast", [RFC2365] Meyer, D., "Administratively Scoped IP Multicast", RFC
July, 1998. 2365, July 1998.
[RFC2374] R. Hinden, et. al., "An IPv6 Aggregatable Global Unicast [RFC2374] Hinden, R., O'Dell, M. and S. Deering, "An IPv6
Address Format", July, 1998. Aggregatable Global Unicast Address Format", RFC 2374, July
1998.
[SAP] Handley, Mark, "SAP: Session Announcement Protocol", [SAP] Handley, M., "SAP: Session Announcement Protocol", Work in
draft-ietf-mmusic-sap-00.txt, November, 1996. Progress.
[SS] www.isi.edu/in-notes/iana/assignments/single-source- [SS] www.isi.edu/in-notes/iana/assignments/single-source-
multicast multicast
13. Author's Address 9. Authors' Addresses
David Meyer David Meyer
Cisco Systems, Inc. Cisco Systems, Inc.
170 W. Tasman Drive 170 W. Tasman Drive
San Jose, CA 95134-1706 San Jose, CA 95134-1706
United States United States
EMail: dmm@cisco.com EMail: dmm@cisco.com
Peter Lothberg Peter Lothberg
Sprint Sprint
VARESA0104 VARESA0104
12502 Sunrise Valley Drive 12502 Sunrise Valley Drive
Reston VA, 20196 Reston VA, 20196
Email: roll@sprint.net
EMail: roll@sprint.net
10. Full Copyright Statement
Copyright (C) The Internet Society (2000). All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
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included on all such copies and derivative works. However, this
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the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
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English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an
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TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
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Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
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