The Scalable Address Resolution Protocol (SARP) for Large Data Centers
RFC 7586
| Document | Type |
RFC - Experimental
(June 2015; No errata)
Was draft-nachum-sarp (individual)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | ISE | ||
| Formats | plain text pdf html bibtex | ||
| IETF conflict review | conflict-review-nachum-sarp | ||
| Stream | ISE state | Published RFC | |
| Consensus Boilerplate | Unknown | ||
| Document shepherd | Nevil Brownlee | ||
| Shepherd write-up | Show (last changed 2015-03-02) | ||
| IESG | IESG state | RFC 7586 (Experimental) | |
| Telechat date | |||
| Responsible AD | (None) | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | No IC | ||
Independent Submission Y. Nachum
Request for Comments: 7586
Category: Experimental L. Dunbar
ISSN: 2070-1721 Huawei
I. Yerushalmi
T. Mizrahi
Marvell
June 2015
The Scalable Address Resolution Protocol (SARP)
for Large Data Centers
Abstract
This document introduces the Scalable Address Resolution Protocol
(SARP), an architecture that uses proxy gateways to scale large data
center networks. SARP is based on fast proxies that significantly
reduce switches' Filtering Database (FDB) table sizes and reduce
impact of ARP and Neighbor Discovery (ND) on network elements in an
environment where hosts within one subnet (or VLAN) can spread over
various locations. SARP is targeted for massive data centers with a
significant number of Virtual Machines (VMs) that can move across
various physical locations.
Independent Submissions Editor Note
This is an Experimental document; that experiment will end two years
after the RFC is published. At that point, the RFC authors will
attempt to determine how widely SARP has been implemented and used.
IESG Note
The IESG notes that the problems described in RFC 6820 can already be
addressed through the simple combination of existing standardized or
other published techniques including Layer 2 VPN (RFC 4664), proxy
ARP (RFC 925), proxy Neighbor Discovery (RFC 4389), IGMP and MLD
snooping (RFC 4541), and ARP mediation for IP interworking of Layer 2
VPNs (RFC 6575).
Nachum, et al. Experimental [Page 1]
RFC 7586 SARP June 2015
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for examination, experimental implementation, and
evaluation.
This document defines an Experimental Protocol for the Internet
community. This is a contribution to the RFC Series, independently
of any other RFC stream. The RFC Editor has chosen to publish this
document at its discretion and makes no statement about its value for
implementation or deployment. Documents approved for publication by
the RFC Editor are not a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7586.
Copyright Notice
Copyright (c) 2015 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.
Nachum, et al. Experimental [Page 2]
RFC 7586 SARP June 2015
Table of Contents
1. Introduction ....................................................3
1.1. SARP Motivation ............................................4
1.2. SARP Overview ..............................................7
1.3. SARP Deployment Options ....................................8
1.4. Comparison with Existing Solutions .........................9
2. Terms and Abbreviations Used in This Document ..................10
3. SARP: Theory of Operation ......................................11
3.1. Control Plane: ARP/ND .....................................11
3.1.1. ARP/NS Request for a Local VM ......................11
3.1.2. ARP/NS Request for a Remote VM .....................12
3.1.3. Gratuitous ARP and Unsolicited Neighbor
Advertisement (UNA) ................................13
3.2. Data Plane: Packet Transmission ...........................13
3.2.1. Local Packet Transmission ..........................13
3.2.2. Packet Transmission between Sites ..................13
3.3. VM Migration ..............................................14
3.3.1. VM Local Migration .................................14
3.3.2. VM Migration from One Site to Another ..............14
3.3.2.1. Impact on IP-to-MAC Mapping Cache
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