NVO3 K. Singh Internet-Draft P. Jain Intended status: Standards Track F. Balus Expires: September 4, 2014 Nuage Networks. W. Henderickx Alcatel-Lucent, Inc. March 03, 2014 VxLAN Router Alert Option draft-singh-nvo3-vxlan-router-alert-01 Abstract This proposal describes a new option to achieve a mechanism which alerts VxLAN terminating VTEP to more closely examine the contents of the packet encapsulated under VxLAN header. This option is useful for case(s) where a given frame encapsulated within a given VXLAN segment responsible for carrying data between two different End Systems contains some control information (e.g OAM information) that may require special handling/processing by terminating VTEP. 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 http://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 September 4, 2014. Copyright Notice Copyright (c) 2014 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 (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents Singh, et al. Expires September 4, 2014 [Page 1] Internet-Draft VxLAN Router Alert Option March 2014 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 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.1. Originating VTEP Procedure . . . . . . . . . . . . . . . . 6 3.2. Terminating VTEP Procedure . . . . . . . . . . . . . . . . 6 4. Management Considerations . . . . . . . . . . . . . . . . . . 7 5. Security Considerations . . . . . . . . . . . . . . . . . . . 8 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 9 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8.1. Normative References . . . . . . . . . . . . . . . . . . . 11 8.2. Informative References . . . . . . . . . . . . . . . . . . 11 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12 Singh, et al. Expires September 4, 2014 [Page 2] Internet-Draft VxLAN Router Alert Option March 2014 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 RFC2119 [RFC2119]. When used in lower case, these words convey their typical use in common language, and are not to be interpreted as described in RFC2119 [RFC2119]. Singh, et al. Expires September 4, 2014 [Page 3] Internet-Draft VxLAN Router Alert Option March 2014 1. Introduction VXLAN [I-D.draft-mahalingam-dutt-dcops-vxlan]is a tunneling mechanism to overlay Layer 2 networks on top of Layer 3 networks. In most cases the end point of the tunnel (VTEP) is intended to be at the edge of the network, typically connecting an access switch to an IP transport network. The access switch could be a physical or a virtual switch located within the hypervisor on the server which is connected to End System which is a VM. VXLAN segment encapsulates End System data at Originating VTEP and carries it over L3 network to the Terminating VTEP, where VXLAN header is interpreted, removed and data is passed on to the End System. There could be some scenarios like for case of OAM, where the network element at originating VTEP needs to encapsulate some control information for a given VXLAN segment, and this control information needs to be analyzed and processed at the terminating VTEP for that VXLAN segment. This document defines a mechanism whereby Originating VTEP can add additional information to the VXLAN header, based upon which the Terminating VTEP can decide to analyze the payload under VXLAN packet, rather then forwarding it to the destination End System. Singh, et al. Expires September 4, 2014 [Page 4] Internet-Draft VxLAN Router Alert Option March 2014 2. Terminology Terminology used in this document: VXLAN: Virtual eXtensible Local Area Network. VTEP: VXLAN Tunnel End Point. VM: Virtual Machine. End System: Could be VM etc. - System whose data is expected to go over VXLAN Segment. OAM: Operations, Administration, and Maintenance Other terminologies are as defined in [I-D.draft-mahalingam-dutt-dcops-vxlan]. Singh, et al. Expires September 4, 2014 [Page 5] Internet-Draft VxLAN Router Alert Option March 2014 3. Approach If the Originating VTEP decides to generate control informtaion, which needs to go over a given VXLAN segment and if the Terminating VTEP needs to analyze and process it, then following procedures have to be followed at Originating and Terminating VTEP(s):- 3.1. Originating VTEP Procedure When creating the VXLAN header for a given VXLAN segment, the Originating VTEP MUST set Router Alert Bit in the Flag bits in VXLAN header. The VNI for this frame MUST be the same as for the given VXLAN segment which carries the data traffic of the End System. VXLAN Header: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |R|R|R|R|I|R|R|RA| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | VXLAN Network Identifier (VNI) | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ RA: Router Alter Bit (Proposed) 3.2. Terminating VTEP Procedure On receiving VXLAN frame, the Terminating VTEP would do the usual VXLAN processing as defined in [I-D.draft-mahalingam-dutt-dcops-vxlan], but if the RA Bit in Flags is Set it MUST send the rest of the inner frame for further processing to the above application. The details of the applications and how it would process the inner frame is outside the scope of this document. This frame MUST not be sent to the target End System. Singh, et al. Expires September 4, 2014 [Page 6] Internet-Draft VxLAN Router Alert Option March 2014 4. Management Considerations None Singh, et al. Expires September 4, 2014 [Page 7] Internet-Draft VxLAN Router Alert Option March 2014 5. Security Considerations TBD Singh, et al. Expires September 4, 2014 [Page 8] Internet-Draft VxLAN Router Alert Option March 2014 6. Acknowledgements The authors want to thank Krishna Ram Kuttuva Jeyaram, Diego Garcia Del Rio and Suresh Boddapati of Nuage Networks for significant contribution and feedback. Singh, et al. Expires September 4, 2014 [Page 9] Internet-Draft VxLAN Router Alert Option March 2014 7. IANA Considerations Router Alter Bit (RA): IANA is request to assing 1 Bit in Flags field of VXLAN Header to communicate VXLAN Router Alert information. Singh, et al. Expires September 4, 2014 [Page 10] Internet-Draft VxLAN Router Alert Option March 2014 8. References 8.1. Normative References [I-D.draft-lasserre-nvo3-framework] Lasserre, M., Balus, F., Morin, T., Bitar, N., and Y. Rekhter, "Framework for DC Network Virtualization", September 2011. [I-D.draft-mahalingam-dutt-dcops-vxlan] Mahalingam, M., Dutt, D., Agarwal, P., Kreeger, L., Sridhar, T., Bursell, M., and C. Wright, "VXLAN: A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks", May 2013. 8.2. Informative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. Singh, et al. Expires September 4, 2014 [Page 11] Internet-Draft VxLAN Router Alert Option March 2014 Authors' Addresses Kanwar Singh Nuage Networks. 755 Ravendale Drive Mountain View, CA 94043 USA Email: kanwar@nuagenetworks.net Pradeep Jain Nuage Networks. 755 Ravendale Drive Mountain View, CA 94043 USA Email: pradeep@nuagenetworks.net Florin Balus Nuage Networks. 755 Ravendale Drive Mountain View, CA 94043 USA Email: florin@nuagenetworks.net Wim Henderickx Alcatel-Lucent, Inc. Copernicuslaan 50, 2018 ANTWERP 2018 BELGIUM Email: Wim.Henderickx@alcatel-lucent.com Singh, et al. Expires September 4, 2014 [Page 12]