NVO3                                                            K. Singh
Internet-Draft                                                   P. Jain
Intended status: Standards Track                       D. Garcia del Rio
Expires: March 24, 2016                                  Nuage Networks.
                                                           W. Henderickx
                                                    Alcatel-Lucent, Inc.
                                                              R. Shekhar
                                                        Juniper Networks
                                                               R. Rahman
                                                           Cisco Systems
                                                      September 21, 2015


                       VxLAN Router Alert Option
                 draft-singh-nvo3-vxlan-router-alert-02

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, any
   control plane protocol packet etc.) 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
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   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 March 24, 2016.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.



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   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
   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.  Conventions Used in This Document  . . . . . . . . . . . . . .  3

   2.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4

   3.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  5

   4.  Approach . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     4.1.  Originating VTEP Procedure . . . . . . . . . . . . . . . .  6
     4.2.  Terminating VTEP Procedure . . . . . . . . . . . . . . . .  6

   5.  Management Considerations  . . . . . . . . . . . . . . . . . .  7

   6.  Security Considerations  . . . . . . . . . . . . . . . . . . .  8

   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  9

   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10

   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 11
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 11

   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12















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1.  Conventions Used in This Document

   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].










































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2.  Introduction

   VXLAN [RFC7348]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, where the network element at
   originating VTEP needs to encapsulate some control information in a
   given VXLAN segment, and this control information needs to be
   analysed and processed at the terminating VTEP for that VXLAN
   segment.  There could be various examples of such control information
   e.g OAM, and protocol control packets encapsulated in 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 analyse the payload under VXLAN packet
   and handle it to slow-path, rather then forwarding it to the
   destination End System.
























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3.  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 [RFC7348].



































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4.  Approach

   If the Originating VTEP decides to generate control information,
   which needs to go over a given VXLAN segment and if the Terminating
   VTEP needs to analyse and process it, then following procedures have
   to be followed at Originating and Terminating VTEP(s):-

4.1.  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 Alert Bit (Proposed)

4.2.  Terminating VTEP Procedure

   On receiving VXLAN frame, the Terminating VTEP would do the usual
   VXLAN processing as defined in [RFC7348], 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.



















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5.  Management Considerations

   None
















































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6.  Security Considerations

   For wide range, security requirements for VxLAN Packets with Route
   Alert (RA) bit set is no different from how IP Router Alert Option is
   handled in Network End Points.

   The most common potential attack could be Denial-of-Service attacks
   by sending VxLAN Packets with Router Alert Bit Set at aggressive
   rate, causing potential high resource utilization.  For such
   scenarios its recommended that implementations regulate sending of
   such packets to control plane via rate limiting.








































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7.  Acknowledgements

   The authors want to thank Krishna Ram Kuttuva Jeyaram, and Suresh
   Boddapati of Nuage Networks for significant contribution and
   feedback.














































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8.  IANA Considerations

   Router Alert Bit (RA): IANA is request to asigh 1 Bit in Flags field
   of VXLAN Header to communicate VXLAN Router Alert information.















































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9.  References

9.1.  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.

   [RFC7348]  Mahalingam, M., Dutt, D., Duda, K., Agarwal, P., Kreeger,
              L., Sridhar, T., Bursell, M., and C. Wright, "Virtual
              eXtensible Local Area Network (VXLAN): A Framework for
              Overlaying Virtualized Layer 2 Networks over Layer 3
              Networks", RFC 7348, DOI 10.17487/RFC7348, August 2014,
              <http://www.rfc-editor.org/info/rfc7348>.

9.2.  Informative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/
              RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.





























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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


   Diego
   Nuage Networks.
   755 Ravendale Drive
   Mountain View, CA  94043
   USA

   Email: diego@nuagenetworks.net


   Wim Henderickx
   Alcatel-Lucent, Inc.
   Copernicuslaan 50, 2018
   ANTWERP  2018
   BELGIUM

   Email: Wim.Henderickx@alcatel-lucent.com


   Ravi Shekhar
   Juniper Networks
   1194 North Mathilda Ave.
   Sunnyvale, CA  94089
   USA

   Email: rshekhar@juniper.net






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   Reshad Rahman
   Cisco Systems
   2000 Innovation Drive
   Kanata, ON  K2K 3E8
   USA

   Email: rrahman@cisco.com












































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