Internet Engineering Task Force J. Lemon, Ed.
Internet-Draft Broadcom
Intended status: Informational F. Maino
Expires: April 28, 2018 M. Smith
Cisco
October 25, 2017

Group Policy Encoding with VXLAN-GPE
draft-lemon-vxlan-gpe-gbp-00

Abstract

This document defines a header companion for the Generic Protocol Extension for Virtual eXtensible Local Area Network (VXLAN-GPE) that is used to carry a Group Policy Identifier for the purposes of policy enforcement.

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

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Copyright Notice

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Table of Contents

1. Introduction

This document defines the group-based policy (GBP) sub-header for VXLAN-GPE [I-D.ietf-nvo3-vxlan-gpe]. The GBP sub-header carries a 16-bit group policy ID that is semantically equivalent to the 16-bit group policy ID defined in [I-D.smith-vxlan-group-policy].

1.1. Conventions

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.

1.2. Abbreviations used in this document

GBP:
Group-Based Policy
VXLAN-GPE:
Virtual eXtensible Local Area Network, Generic Protocol Extension [I-D.ietf-nvo3-vxlan-gpe]

2. Group Based Policy Sub-header

The Group-Based Policy (GBP) Sub-header follows the VXLAN-GPE header, or another VXLAN-GPE subheader.

2.1. Header Format

The format of the GBP sub-header is as shown below:

       
    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |      Group Policy ID          | Res |E|A|D|Ver| Next Protocol |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

           

An example frame format is as shown below:

       
 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                    Outer Ethernet Header                      |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                        Outer IP Header                        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                       Outer UDP Header                        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
|R|R|Ver|I|P|R|O|          Reserved             | NP = GBP      |  |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ GPE
|     Virtual Network Identifier (VNI)          | Reserved      |  |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
|      Group Policy ID          | Res |E|A|D|Ver| Next Protocol | GBP
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
|                                                               |
:                        Next Protocol                          :
|                                                               |
+---------------------------------------------------------------+

           

3. IANA Considerations

IANA is requested to add a new value to registry of "Next Protocol", which is defined in [I-D.ietf-nvo3-vxlan-gpe]. The new value of 6 will signify a GBP sub-header as the next protocol.

4. Security Considerations

The same security considerations applied to [I-D.ietf-nvo3-vxlan-gpe] and to [I-D.smith-vxlan-group-policy] apply to this document.

Additionally, the security policy value carried in the GBP header impacts security directly. There is a risk that this identifier could be altered. Accordingly, the network should be designed such that this header can be inserted only by trusted entities, and can not be altered before reaching the destination. This can be mitigated through physical security of the network and/or by encryption or validation of the entire packet, including the GBP.

5. Normative References

[I-D.ietf-nvo3-vxlan-gpe] Maino, F., Kreeger, L. and U. Elzur, "Generic Protocol Extension for VXLAN", Internet-Draft draft-ietf-nvo3-vxlan-gpe-04, April 2017.
[I-D.smith-vxlan-group-policy] Smith, M. and L. Kreeger, "VXLAN Group Policy Option", Internet-Draft draft-smith-vxlan-group-policy-04, October 2017.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997.

Authors' Addresses

John Lemon (editor) Broadcom Limited 3151 Zanker Road San Jose, CA 95134 USA EMail: john.lemon@broadcom.com
Fabio Maino Cisco Systems EMail: fmaino@cisco.com
Michael Smith Cisco Systems EMail: michsmit@cisco.com