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Practices for scaling ARP and ND for large data centers
draft-dunbar-armd-arp-nd-scaling-practices-07

Document type: Active Internet-Draft (individual)
Document stream: ISE
Last updated: 2014-04-14 (latest revision 2013-03-13)
Intended RFC status: Informational
Other versions: plain text, pdf, html
IETF Conflict Review: conflict-review-dunbar-armd-arp-nd-scaling-practices

ISE State: In IESG Review
Document shepherd: Nevil Brownlee
Shepherd Write-Up: Last changed 2014-03-13

IESG State: AD Evaluation
IANA Review State: IANA OK - No Actions Needed
IANA Action State: None
Responsible AD: (None)
Send notices to: rfc-ise@rfc-editor.org, ldunbar@huawei.com, warren@kumari.net, draft-dunbar-armd-arp-nd-scaling-practices@tools.ietf.org

Network working Group                                L. Dunbar
Internet Draft                                          Huawei
Intended status: Informational                       W. Kumari
Expires: September 2013                                 Google
                                               Igor Gashinsky
                                                        Yahoo
                                                March 13, 2013

         Practices for scaling ARP and ND for large data centers

              draft-dunbar-armd-arp-nd-scaling-practices-07

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   This Internet-Draft is submitted to IETF in full conformance with
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   This Internet-Draft will expire on September 13, 2013.

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Dunbar-Kumari-Gashinsky  Expires September 13, 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 ................................................. 4
   3. Common DC network Designs.................................... 5
   4. Layer 3 to Access Switches................................... 5
   5. Layer 2 practices to scale ARP/ND............................ 6
      5.1. Practices to alleviate APR/ND burden on L2/L3 boundary
      routers ..................................................... 6
      5.1.1. Communicating with a peer in a different subnet....... 6
      5.1.2. L2/L3 boundary router processing of inbound traffic .. 7
      5.1.3. Inter subnets communications ......................... 8
      5.2. Static ARP/ND entries on switches ...................... 8
      5.3. ARP/ND Proxy approaches................................. 9
      5.4. Multicast Scaling Issues .............................. 10
   6. Practices to scale ARP/ND in Overlay models ................ 10
   7. Summary and Recommendations ................................ 11
   8. Security Considerations .................................... 11
   9. IANA Considerations ........................................ 11
   10. Acknowledgements .......................................... 12
   11. References ................................................ 12
      11.1. Normative References.................................. 12
      11.2. Informative References................................ 13
   Authors' Addresses ............................................ 13

Dunbar-Kumari-Gashinsky   Expires September 13, 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 [RFC6820], 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 interfaces of L2/L3
   boundary routers and ToR switches and allow some subnets to span
   across multiple router ports.

   Note: The L2/L3 boundary routers in this draft are capable of

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