ROLL P. Thubert, Ed. Internet-Draft Cisco Systems Updates: 6550 (if approved) May 23, 2019 Intended status: Standards Track Expires: November 24, 2019 Configuration option for RFC 8138 draft-thubert-roll-turnon-rfc8138-00 Abstract This document complements RFC 8138 and dedicates a bit in the RPL configuration option to indicate whether RFC 8138 compression should be used within the RPL instance. When the bit is not set, source nodes that support RFC 8138 should refrain from using the compression unless the information is superseded by configuration. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. 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." This Internet-Draft will expire on November 24, 2019. Copyright Notice Copyright (c) 2019 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of Thubert Expires November 24, 2019 [Page 1] Internet-Draft Enabling RFC 8138 May 2019 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. BCP 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. Updating RFC 6550 . . . . . . . . . . . . . . . . . . . . . . 2 4. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 6. Security Considerations . . . . . . . . . . . . . . . . . . . 3 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 3 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 3 8.1. Normative References . . . . . . . . . . . . . . . . . . 3 8.2. Informative References . . . . . . . . . . . . . . . . . 4 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction The transition to [RFC8138] in a network can only be done when all nodes support the specification. In a mixed case with both RFC8138-capable and non-capable nodes, the compression should be turned off. This document complements RFC 8138 and dedicates a bit in the RPL configuration option to indicate whether RFC 8138 compression should be used within the RPL instance. When the bit is not set, source nodes that support RFC 8138 should refrain from using the compression unless the information is superseded by configuration. 2. BCP 14 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119][RFC8174] when, and only when, they appear in all capitals, as shown here. 3. Updating RFC 6550 RPL defines a configuration option that is registered to IANA in section 20.14. of [RFC6550]. This specification defines a new flag "Enable RFC8138 Compression" (T) that is encoded in one of the reserved control bits in the option. The new flag is set to turn on the use of the compression of RPL artifacts with RFC 8138. Thubert Expires November 24, 2019 [Page 2] Internet-Draft Enabling RFC 8138 May 2019 4. Operation A node that supports this specification SHOULD source packets in the compressed form using [RFC8138] if the new T flag is set in the RPL configuration option from its parents. Failure to do so will result in larger packets, yields higher risks of loss and may cause a fragmentation. A node that supports this specification SHOULD refrain from sourcing packets in the compressed form using [RFC8138] if the T flag is reset. This behaviour can be overridden by a configuration of the node in order to cope with intermediate implementations of the root that support [RFC8138] but not this specification and cannot set the T flag. Regardless of the setting of the bit, the node MUST forward a packet in the form it was received, compressed or uncompressed. 5. IANA Considerations This specification updates the "Registry for the DODAG Configuration Option Flags" that was created for [RFC6550] as follows: +---------------+---------------------------------+-------------+ | Bit number | Suggested value | Defined in | +---------------+---------------------------------+-------------+ | 2 (suggested) | Turn on RFC8138 Compression (T) | This RFC | +---------------+---------------------------------+-------------+ Table 1: New DODAG Configuration Option Flag 6. Security Considerations No specific threat was identified with this specification. 7. Acknowledgments 8. References 8.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . Thubert Expires November 24, 2019 [Page 3] Internet-Draft Enabling RFC 8138 May 2019 [RFC6550] Winter, T., Ed., Thubert, P., Ed., Brandt, A., Hui, J., Kelsey, R., Levis, P., Pister, K., Struik, R., Vasseur, JP., and R. Alexander, "RPL: IPv6 Routing Protocol for Low-Power and Lossy Networks", RFC 6550, DOI 10.17487/RFC6550, March 2012, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . 8.2. Informative References [RFC8138] Thubert, P., Ed., Bormann, C., Toutain, L., and R. Cragie, "IPv6 over Low-Power Wireless Personal Area Network (6LoWPAN) Routing Header", RFC 8138, DOI 10.17487/RFC8138, April 2017, . Author's Address Pascal Thubert (editor) Cisco Systems, Inc Building D 45 Allee des Ormes - BP1200 MOUGINS - Sophia Antipolis 06254 FRANCE Phone: +33 497 23 26 34 Email: pthubert@cisco.com Thubert Expires November 24, 2019 [Page 4]