Network Working Group Yakov Rekhter (Juniper Networks) Internet Draft Expiration Date: March 2007 IPv6 Address Specific BGP Extended Communities Attribute draft-rekhter-v6-ext-communities-00.txt Status of this Memo Internet-Drafts are working documents of the Internet Engineering 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 and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress". The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. IPR Disclosure Acknowledgement By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Abstract Current specifications of BGP Extended Communities [BGP-EXTCOMM] support IPv4 Address Specific Extended Community, but do not support IPv6 Address Specific Extended Community. The lack of IPv6 Address Specific Extended Community may be a problem when an application uses IPv4 Address Specific Extended Community, and one wants to use this application in a pure IPv6 environment. This document defines a new BGP attribute, IPv6 Address Specific Extended Community that addresses this problem. The IPv6 Address Specific Extended Community is similar to the IPv4 Address Specific Extended Community, except that it carries an IPv6 address rather than an IPv4 address. Specification of Requirements The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 1. Introduction Current specifications of BGP Extended Communities [BGP-EXTCOMM] support IPv4 Addres Specific Extended Community, but do not support IPv6 Address Specific Extended Community. The lack of IPv6 Address Specific Extended Community may be a problem when an application uses IPv4 Address Specific Extended Community, and one wants to use this application in a pure IPv6 environment. Because the BGP Extended Community attribute defines each BGP Extended Community as being 8 octets long, it is not possible to define the IPv6 Specific Extended Community using the existing BGP Extended Community attribute [BGP-EXTCOMM]. Therefore this document defines a new BGP attribute, IPv6 Address Specific Extended Community that has structure similar to the IPv4 Address Specific Extended Community, and thus could be used in a pure IPv6 environment as a replacement of the IPv4 Address Specific Extended Community. 2. IPv6 Address Specific BGP Extended Communities Attribute The IPv6 Address Specific Extended Communities Attribute is a transitive optional BGP attribute. The attribute consists of a set of "IPv6 Address Specific extended communities". All routes with the IPv6 Address Specific Extended Communities attribute belong to the communities listed in the attribute. Just like all other BGP extended communities, the IPv6 Address Specific extended community supports multiple Sub-types. Each IPv6 Address Specific extended community is encoded as a twenty octets quantity, as follows: 0 1 2 3 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | 0x00 or 0x40 | Sub-Type | Global Administrator | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Global Administrator (cont.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Global Administrator (cont.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Global Administrator (cont.) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Global Administrator (cont.) | Local Administrator | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ The first high-order octet indicates whether a particular Sub-type of this community is transitive across ASes (0x00), or not (0x40). The second high-order octet of this extended type is used to indicate Sub-types. The Sub-types are the same as for IPv4 Address Specific extended community. Global Administrator field: 16 octets This field contains an IPv6 unicast address assigned by one of the Internet registries. Local Administrator: 2 octets The organization which has been assigned the IPv6 address in the Global Administrator field, can encode any information in this field. The format and meaning of this value encoded in this field should be defined by the sub-type of the community. 3. IANA Considerations This document defines a new BGP attribute, called IPv6 Address Specific Extended Community. This document defines a class of extended communities called IPv6 Address Specific extended community for which the IANA is to create and maintain a registry entitled "IPv6 Address Specific Extended Community". Future assignment are to be made using the "First Come First Served" policy defined in [RFC2434]. The Sub-type values for the transitive communities of the IPv6 Address Specific Extended Community class are 0x0100-0x01ff, and for the non-transitive communities of that class are 0x4100-0x41ff. Assignments consist of a name and the value. This document makes the following assignments for the IPv6 Address Specific extended community types: Name Sub-type Value ---- -------------- IPv6 address specific Route Target 0x0002 IPv6 address specific Route Origin 0x0003 4. Security Considerations All the security considerations for BGP Extended Communities apply here. 5. Intellectual Property Considerations This section is taken from Section 5 of RFC 3668. The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf- ipr@ietf.org. 6. Copyright Notice Copyright (C) The Internet Society (2006). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 7. Acknowledgements 8. Normative References [BGP-4] Rekhter, Y., and T. Li, "A Border Gateway Protocol 4 (BGP-4)", RFC 1771, March 1995. [RFC1997] Chandra, R., Traina, P., Li, T., "BGP Communities Attribute", RFC1997, August 1996. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [BGP-EXTCOMM] Sangli, S., Tappan, D., and Y. Rekhter, "BGP Extended Communities Attribute", RFC 4360, February 2006. 9. 10. Author Information Yakov Rekhter Juniper Networks, Inc. e-mail: yakov@juniper.net