Practices for scaling ARP and ND for large data centers
draft-dunbar-armd-arp-nd-scaling-practices-05

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Document Type Active Internet-Draft (individual in ops area)
Last updated 2013-02-01 (latest revision 2013-01-31)
Stream IETF
Intended RFC status Informational
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IETF conflict review conflict-review-dunbar-armd-arp-nd-scaling-practices
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IESG IESG state AD Evaluation::Revised I-D Needed
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Responsible AD Ron Bonica
Send notices to ldunbar@huawei.com, warren@kumari.net, draft-dunbar-armd-arp-nd-scaling-practices@tools.ietf.org
L. Dunbar
    Internet Draft                                        Huawei
    Intended status: Informational                     W. Kumari
    Expires: July 2013                                    Google
                                                  Igor Gashinsky 
                                                           Yahoo
                                                January 31, 2013

          Practices for scaling ARP and ND for large data centers

               draft-dunbar-armd-arp-nd-scaling-practices-05

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

    Abstract

       This draft documents some operational practices that allow
       ARP/ND to scale in data center environments.

    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 peer........ 5
             5.1.2. L2/L3 boundary router processing of inbound
             traffic .................................................. 6
             5.1.3. Inter subnets communications ...................... 7
          5.2. Static ARP/ND entries on switches ...................... 7
          5.3. ARP/ND Proxy approaches ................................ 8
       6. Practices to scale ARP/ND in Overlay models ................. 8
       7. Summary and Recommendations ................................. 9
       8. Security Considerations ..................................... 9
       9. IANA Considerations ........................................ 10
       10. Acknowledgements .......................................... 10
       11. References ................................................ 10
          11.1. Normative References.................................. 10
          11.2. Informative References................................ 10
       Authors' Addresses ............................................ 11

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

    1. Introduction

       This draft documents some operational practices that allow
       ARP/ND to scale in data center environments.

       As described in [ARMD-Problem], 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 networks need
       to enable multiple broadcast domains (many VLANs) on the
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