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+Network Working Group P. Quinn
+Internet-Draft Cisco Systems, Inc.
+Intended status: Experimental P. Agarwal
+Expires: January 4, 2015 Broadcom
+ R. Fernando
+ L. Kreeger
+ D. Lewis
+ F. Maino
+ M. Smith
+ N. Yadav
+ Cisco Systems, Inc.
+ L. Yong
+ Huawei USA
+ X. Xu
+ Huawei Technologies
+ U. Elzur
+ Intel
+ P. Garg
+ Microsoft
+ July 3, 2014
+
+
+ Generic Protocol Extension for VXLAN
+ draft-quinn-vxlan-gpe-03.txt
+
+Abstract
+
+ This draft describes extending Virtual eXtensible Local Area Network
+ (VXLAN), via changes to the VXLAN header, with three new
+ capabilities: support for multi-protocol encapsulation, operations,
+ administration and management (OAM) signaling and explicit
+ versioning.
+
+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."
+
+
+
+
+Quinn, et al. Expires January 4, 2015 [Page 1]
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+Internet-Draft Generic Protocol Extension for VXLAN July 2014
+
+
+ This Internet-Draft will expire on January 4, 2015.
+
+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
+ 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.
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+Quinn, et al. Expires January 4, 2015 [Page 2]
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+Internet-Draft Generic Protocol Extension for VXLAN July 2014
+
+
+Table of Contents
+
+ 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
+ 2. VXLAN Without Protocol Extension . . . . . . . . . . . . . . . 5
+ 3. Generic Protocol Extension VXLAN (VXLAN-gpe) . . . . . . . . . 6
+ 3.1. Multi Protocol Support . . . . . . . . . . . . . . . . . . 6
+ 3.2. OAM Support . . . . . . . . . . . . . . . . . . . . . . . 7
+ 3.3. Version Bits . . . . . . . . . . . . . . . . . . . . . . . 7
+ 4. Backward Compatibility . . . . . . . . . . . . . . . . . . . . 8
+ 4.1. VXLAN VTEP to VXLAN-gpe VTEP . . . . . . . . . . . . . . . 8
+ 4.2. VXLAN-gpe VTEP to VXLAN VTEP . . . . . . . . . . . . . . . 8
+ 4.3. VXLAN-gpe UDP Ports . . . . . . . . . . . . . . . . . . . 8
+ 4.4. VXLAN-gpe and Encapsulated IP Header Fields . . . . . . . 8
+ 5. VXLAN-gpe Examples . . . . . . . . . . . . . . . . . . . . . . 9
+ 6. Security Considerations . . . . . . . . . . . . . . . . . . . 11
+ 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 12
+ 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
+ 8.1. UDP Port . . . . . . . . . . . . . . . . . . . . . . . . . 13
+ 8.2. VXLAN-gpe Next Protocol . . . . . . . . . . . . . . . . . 13
+ 8.3. VXLAN-gpe Reserved Bits . . . . . . . . . . . . . . . . . 13
+ 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
+ 9.1. Normative References . . . . . . . . . . . . . . . . . . . 14
+ 9.2. Informative References . . . . . . . . . . . . . . . . . . 14
+ Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15
+
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+Internet-Draft Generic Protocol Extension for VXLAN July 2014
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+
+1. Introduction
+
+ Virtual eXtensible Local Area Network [VXLAN] defines an
+ encapsulation format that encapsulates Ethernet frames in an outer
+ UDP/IP transport. As data centers evolve, the need to carry other
+ protocols encapsulated in an IP packet is required, as well as the
+ need to provide increased visibility and diagnostic capabilities
+ within the overlay. The VXLAN header does not specify the protocol
+ being encapsulated and therefore is currently limited to
+ encapsulating only Ethernet frame payload, nor does it provide the
+ ability to define OAM protocols. Rather than defining yet another
+ encapsulation, VXLAN is extended to provide protocol typing and OAM
+ capabilities.
+
+ This document describes extending VXLAN via the following changes:
+
+ Next Protocol Bit (P bit): A reserved flag bit is allocated, and set
+ in the VXLAN-gpe header to indicate that a next protocol field is
+ present.
+
+ OAM Flag Bit (O bit): A reserved flag bit is allocated, and set in
+ the VXLAN-gpe header, to indicate that the packet is an OAM
+ packet.
+
+ Version: Two reserved bits are allocated, and set in the VXLAN-gpe
+ header, to indicate VXLAN-gpe protocol version.
+
+ Next Protocol: A 8 bit next protocol field is present in the VXLAN-
+ gpe header.
+
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+2. VXLAN Without Protocol Extension
+
+ As described in the introduction, the VXLAN header has no protocol
+ identifier that indicates the type of payload being carried by VXLAN.
+ Because of this, VXLAN is limited to an Ethernet payload.
+ Furthermore, the VXLAN header has no mechanism to signal OAM packets.
+
+ The VXLAN header defines bits 0-7 as flags (some defined, some
+ reserved), the VXLAN network identifier (VNI) field and several
+ reserved bits. The flags provide flexibility to define how the
+ reserved bits can be used to change the definition of the VXLAN
+ header.
+
+
+
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |R|R|R|R|I|R|R|R| Reserved |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | VXLAN Network Identifier (VNI) | Reserved |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+
+ Figure 1: VXLAN Header
+
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+Internet-Draft Generic Protocol Extension for VXLAN July 2014
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+3. Generic Protocol Extension VXLAN (VXLAN-gpe)
+
+3.1. Multi Protocol Support
+
+ This draft defines the following two changes to the VXLAN header in
+ order to support multi-protocol encapsulation:
+
+ P Bit: Flag bit 5 is defined as the Next Protocol bit. The P bit
+ MUST be set to 1 to indicate the presence of the 8 bit next
+ protocol field.
+
+ P = 0 indicates that the payload MUST conform to VXLAN as defined
+ in [VXLAN].
+
+ Flag bit 5 was chosen as the P bit because this flag bit is
+ currently reserved in VXLAN.
+
+ Next Protocol Field: The lower 8 bits of the first word are used to
+ carry a next protocol. This next protocol field contains the
+ protocol of the encapsulated payload packet. A new protocol
+ registry will be requested from IANA.
+
+ This draft defines the following Next Protocol values:
+
+ 0x1 : IPv4
+ 0x2 : IPv6
+ 0x3 : Ethernet
+ 0x4 : Network Service Header [NSH]
+
+
+
+
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |R|R|R|R|I|P|R|R| Reserved |Next Protocol |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | VXLAN Network Identifier (VNI) | Reserved |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+
+
+ Figure 2: VXLAN-gpe Next Protocol
+
+
+
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+Quinn, et al. Expires January 4, 2015 [Page 6]
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+3.2. OAM Support
+
+ Flag bit 7 is defined as the O bit. When the O bit is set to 1, the
+ packet is an OAM packet and OAM processing MUST occur. The OAM
+ protocol details are out of scope for this document. As with the
+ P-bit, bit 7 is currently a reserved flag in VXLAN.
+
+
+
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |R|R|R|R|I|P|R|O| Reserved |Next Protocol |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | VXLAN Network Identifier (VNI) | Reserved |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+
+
+ Figure 3: VXLAN-gpe OAM Bit
+
+3.3. Version Bits
+
+ VXLAN-gpe bits 8 and 9 are defined as version bits. These bits are
+ reserved in VXLAN. The version field is used to ensure backward
+ compatibility going forward with future VXLAN-gpe updates.
+
+ The initial version for VXLAN-gpe is 0.
+
+
+
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |R|R|R|R|I|P|R|O|Ver| Reserved |Next Protocol |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | VXLAN Network Identifier (VNI) | Reserved |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+
+
+
+
+ Figure 4: VXLAN-gpe Version Bits
+
+
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+4. Backward Compatibility
+
+4.1. VXLAN VTEP to VXLAN-gpe VTEP
+
+ As per VXLAN, reserved bits 5 and 7, VXLAN-gpe P and O-bits
+ respectively must be set to zero. The remaining reserved bits must
+ be zero, including the VXLAN-gpe version field, bits 8 and 9. The
+ encapsulated payload MUST be Ethernet.
+
+4.2. VXLAN-gpe VTEP to VXLAN VTEP
+
+ A VXLAN-gpe VTEP MUST NOT encapsulate non-Ethernet frames to a VXLAN
+ VTEP. When encapsulating Ethernet frames to a VXLAN VTEP, the VXLAN-
+ gpe VTEP will set the P bit to 0, the Next Protocol to 0 and use UDP
+ destination port 4789. A VXLAN-gpe VTEP MUST also set O = 0 and Ver
+ = 0 when encapsulating Ethernet frames to VXLAN VTEP. The receiving
+ VXLAN VTEP will threat this packet as a VXLAN packet.
+
+ A method for determining the capabilities of a VXLAN VTEP (gpe or
+ non-gpe) is out of the scope of this draft.
+
+4.3. VXLAN-gpe UDP Ports
+
+ VXLAN-gpe uses a new UDP destination port (to be assigned by IANA)
+ when sending traffic to VXLAN-gpe VTEPs.
+
+4.4. VXLAN-gpe and Encapsulated IP Header Fields
+
+ When encapsulating and decapsulating IPv4 and IPv6 packets, certain
+ fields, such as IPv4 Time to Live (TTL) from the inner IP header need
+ to be considered. VXLAN-gpe IP encapsulation and decapsulation
+ utilizes the techniques described in [RFC6830], section 5.3.
+
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+5. VXLAN-gpe Examples
+
+ This section provides three examples of protocols encapsulated using
+ the Generic Protocol Extension for VXLAN described in this document.
+
+
+
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |R|R|R|R|I|1|R|0|0|0| Reserved | NP = IPv4 |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | VXLAN Network Identifier (VNI) | Reserved |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Original IPv4 Packet |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+
+
+ Figure 5: IPv4 and VXLAN-gpe
+
+
+
+
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |R|R|R|R|I|1|R|0|0|0| Reserved | NP = IPv6 |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | VXLAN Network Identifier (VNI) | Reserved |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Original IPv6 Packet |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+
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+ Figure 6: IPv6 and VXLAN-gpe
+
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+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |R|R|R|R|I|1|R|0|0|0| Reserved |NP = Ethernet |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | VXLAN Network Identifier (VNI) | Reserved |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Original Ethernet Frame |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
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+ Figure 7: Ethernet and VXLAN-gpe
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+Internet-Draft Generic Protocol Extension for VXLAN July 2014
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+
+6. Security Considerations
+
+ VXLAN's security is focused on issues around L2 encapsulation into
+ L3. With VXLAN-gpe, issues such as spoofing, flooding, and traffic
+ redirection are dependent on the particular protocol payload
+ encapsulated.
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+Internet-Draft Generic Protocol Extension for VXLAN July 2014
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+
+7. Acknowledgments
+
+ A special thank you goes to Dino Farinacci for his guidance and
+ detailed review.
+
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+Internet-Draft Generic Protocol Extension for VXLAN July 2014
+
+
+8. IANA Considerations
+
+8.1. UDP Port
+
+ A new UDP port will be requested from IANA.
+
+8.2. VXLAN-gpe Next Protocol
+
+ IANA is requested to set up a registry of "Next Protocol". These are
+ 8-bit values. Next Protocol values 0, 1, 2, 3 and 4 are defined in
+ this draft. New values are assigned via Standards Action [RFC5226].
+
+ +---------------+-------------+---------------+
+ | Next Protocol | Description | Reference |
+ +---------------+-------------+---------------+
+ | 0 | Reserved | This document |
+ | | | |
+ | 1 | IPv4 | This document |
+ | | | |
+ | 2 | IPv6 | This document |
+ | | | |
+ | 3 | Ethernet | This document |
+ | | | |
+ | 4 | NSH | This document |
+ | | | |
+ | 5..253 | Unassigned | |
+ +---------------+-------------+---------------+
+
+ Table 1
+
+8.3. VXLAN-gpe Reserved Bits
+
+ There are ten bits at the beginning of the VXLAN-gpe header. New
+ bits are assigned via Standards Action [RFC5226].
+
+ Bits 0-3 - Reserved
+ Bit 4 - Instance ID (I bit)
+ Bit 5 - Next Protocol (P bit)
+ Bit 6 - Reserved
+ Bit 7 - OAM (O bit)
+ Bits 8-9 - Version
+
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+Quinn, et al. Expires January 4, 2015 [Page 13]
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+Internet-Draft Generic Protocol Extension for VXLAN July 2014
+
+
+9. References
+
+9.1. Normative References
+
+ [RFC0768] Postel, J., "User Datagram Protocol", STD 6, RFC 768,
+ August 1980.
+
+ [RFC0791] Postel, J., "Internet Protocol", STD 5, RFC 791,
+ September 1981.
+
+ [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
+ Requirement Levels", BCP 14, RFC 2119, March 1997.
+
+ [RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
+ IANA Considerations Section in RFCs", BCP 26, RFC 5226,
+ May 2008.
+
+9.2. Informative References
+
+ [NSH] Quinn, P. and et al. , "Network Service Header", 2014.
+
+ [RFC1700] Reynolds, J. and J. Postel, "Assigned Numbers", RFC 1700,
+ October 1994.
+
+ [RFC6830] Farinacci, D., Fuller, V., Meyer, D., and D. Lewis, "The
+ Locator/ID Separation Protocol (LISP)", RFC 6830,
+ January 2013.
+
+ [VXLAN] Dutt, D., Mahalingam, M., Duda, K., Agarwal, P., Kreeger,
+ L., Sridhar, T., Bursell, M., and C. Wright, "VXLAN: A
+ Framework for Overlaying Virtualized Layer 2 Networks over
+ Layer 3 Networks", 2013.
+
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+Quinn, et al. Expires January 4, 2015 [Page 14]
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+Internet-Draft Generic Protocol Extension for VXLAN July 2014
+
+
+Authors' Addresses
+
+ Paul Quinn
+ Cisco Systems, Inc.
+
+ Email: paulq@cisco.com
+
+
+ Puneet Agarwal
+ Broadcom
+
+ Email: pagarwal@broadcom.com
+
+
+ Rex Fernando
+ Cisco Systems, Inc.
+
+ Email: rex@cisco.com
+
+
+ Larry Kreeger
+ Cisco Systems, Inc.
+
+ Email: kreeger@cisco.com
+
+
+ Darrel Lewis
+ Cisco Systems, Inc.
+
+ Email: darlewis@cisco.com
+
+
+ Fabio Maino
+ Cisco Systems, Inc.
+
+ Email: kreeger@cisco.com
+
+
+ Michael Smith
+ Cisco Systems, Inc.
+
+ Email: michsmit@cisco.com
+
+
+
+
+
+
+
+
+
+Quinn, et al. Expires January 4, 2015 [Page 15]
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+Internet-Draft Generic Protocol Extension for VXLAN July 2014
+
+
+ Navindra Yadav
+ Cisco Systems, Inc.
+
+ Email: nyadav@cisco.com
+
+
+ Lucy Yong
+ Huawei USA
+
+ Email: lucy.yong@huawei.com
+
+
+ Xiaohu Xu
+ Huawei Technologies
+
+ Email: xuxiaohu@huawei.com
+
+
+ Uri Elzur
+ Intel
+
+ Email: uri.elzur@intel.com
+
+
+ Pankaj Garg
+ Microsoft
+
+ Email: Garg.Pankaj@microsoft.com