Practices for scaling ARP and ND for Large Data Centers
draft-dunbar-armd-arp-nd-scaling-practices-02

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Document Type Active Internet-Draft (individual in ops area)
Last updated 2012-08-31
Stream IETF
Intended RFC status Informational
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Send notices to ldunbar@huawei.com, warren@kumari.net, draft-dunbar-armd-arp-nd-scaling-practices@tools.ietf.org
ARMD                                                       L. Dunbar
Internet Draft                                                Huawei
Intended status: Informational                             W. Kumari
Expires: February 2013                                        Google
                                                      Igor Gashinsky
                                                                Yahoo
                                                      August 31, 2012

          Practices for scaling ARP and ND for Large Data Centers

               draft-dunbar-armd-arp-nd-scaling-practices-02

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                     Expires February 31, 2013               [Page 1]
Internet-Draft   Pratices to scale ARP/ND in large DC

Abstract

   This draft documents some simple practices that scale ARP/ND in data
   center environments.

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 RFC-2119 [RFC2119].

Table of Contents

   1. Introduction ................................................ 3
   2. Terminology ................................................. 3
   3. Common DC network Designs.................................... 4
   4. Layer 3 to Access Switches................................... 4
   5. Layer 2 practices to scale ARP/ND............................ 5
      5.1. Practices to alleviate APR/ND burden on L2/L3 boundary
      routers ..................................................... 5
         5.1.1. Station communicating with an external pe.......... 5
         5.1.2. L2/L3 boundary router processing of inbound traffic.. 6
         5.1.3. Inter subnets communications .........................6
      5.2. Static ARP/ND entries on switches ....................... 7
      5.3. ARP/ND Proxy approaches ................................. 7
   6. Practices to scale ARP/ND in Overlay models .................. 8
   7. Summary and Recommendations .................................. 8
   8. Security Considerations ...................................... 9
   9. IANA Considerations ......................................... 9
   10. Acknowledgements ........................................... 9
   11. References ................................................. 9
      11.1. Normative References................................... 9
      11.2. Informative References................................. 9
   Authors' Addresses ............................................ 10

Dunbar-Kumari-Gashinsky    Expires February 31, 2013           [Page 2]
Internet-Draft   Pratices to scale ARP/ND in large DC

1. Introduction

   As described in [ARMD-Problems], the increasing trend of rapid
   workload shifting and server virtualization in modern data centers
   requires servers to be loaded (or re-loaded) with different VMs or
   applications at different times. Different VMs residing on one
   physical server may have different IP addresses, or may even be in
   different IP subnets.

   In order to allow a physical server to be loaded with VMs in
   different subnets, or VMs to be moved to different server racks
   without IP address re-configuration, the corresponding networks need
   to enable multiple broadcast domains (many VLANs) on the interfaces
   of L2/L3 boundary routers and ToR switches. Unfortunately, when the
   combined number of VMs (or hosts) in all those subnets is large,
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