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.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Conventions . . . . . . . . . . . . . . . . . . . . . . . 2
1.2. Abbreviations used in this document . . . . . . . . . . . 2
2. Group Based Policy Sub-header . . . . . . . . . . . . . . . . 2
2.1. Header Format . . . . . . . . . . . . . . . . . . . . . . 2
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. Normative References . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
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 [RFC2119].
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:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Group Policy ID | Res |E|A|D|Ver| Next Protocol |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
o Group Policy ID: 16 bit identifier that indicates the Group Policy
ID being encapsulated by this GBP sub-header. The allocation of
Group Policy ID values is outside the scope of this document.
o Reserved (Res): the 3 bit field MUST be set to zero on
transmission and ignored on receipt.
o End Destination bit (E bit): The E bit is set to 0 to represent
the Group Policy ID associated with the sender of the packet. The
E bit is set to 1 to represent the Group Policy ID associated with
the end destination of the packet. Note that if the packet
carryies a destination group sub-header, it MUST also carry a
source group sub-header.
o Policy Applied bit (A bit): The A bit is set to 0 to indicate that
the group policy has not (yet) been applied to this packet. Group
policies MUST be applied by devices when the A bit is set to 0 and
the destination Group has been determined. Devices that apply the
group policy MUST set the A bit to 1 after the policy has been
applied. The A bit is set to 1 to indicate that the group policy
has already been applied to this packet. Policies that redirect
the packet MUST NOT be applied by devices when the A bit is set.
Policies that cause the packet to be dropped MAY be applied.
o Don't Learn bit (D bit): The D bit is set to 0 to indicate that
the egress VTEP MUST NOT learn the source address of the
encapsulated frame.
o Version (Ver): indicates the Version of the Group Policy VXLAN-GPE
sub-header. The initial version is 0.
o Next Protocol: This 8 bit field indicates the protocol header
immediately following this VXLAN GPE sub-header. Next Protocol
types are encoded as specified in [I-D.ietf-nvo3-vxlan-gpe].
An example frame format is as shown below:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 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", draft-ietf-nvo3-vxlan-gpe-04 (work
in progress), April 2017.
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[I-D.smith-vxlan-group-policy]
Smith, M. and L. Kreeger, "VXLAN Group Policy Option",
draft-smith-vxlan-group-policy-04 (work in progress),
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,
<https://www.rfc-editor.org/info/rfc2119>.
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
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