Practices for scaling ARP and ND for large data centers
draft-dunbar-armd-arp-nd-scaling-practices-04
The information below is for an old version of the document |
Document |
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Active Internet-Draft (individual in ops area)
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Author |
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Linda Dunbar
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Last updated |
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2012-12-11
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IETF
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Intended RFC status |
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Informational
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pdf
htmlized (tools)
htmlized
bibtex
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Reviews |
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IETF conflict review |
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conflict-review-dunbar-armd-arp-nd-scaling-practices |
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WG state
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(None)
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Document shepherd |
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None
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IESG |
IESG state |
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AD Evaluation::AD Followup
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Ron Bonica
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Send notices to |
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ldunbar@huawei.com, warren@kumari.net, draft-dunbar-armd-arp-nd-scaling-practices@tools.ietf.org
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ARMD L. Dunbar
Internet Draft Huawei
Intended status: Informational W. Kumari
Expires: June 2013 Google
Igor Gashinsky
Yahoo
December 11, 2012
Practices for scaling ARP and ND for large data centers
draft-dunbar-armd-arp-nd-scaling-practices-04
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This Internet-Draft will expire on June 11, 2013.
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Expires June 11, 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.
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 ......................................... 9
10. Acknowledgements .......................................... 10
11. References ................................................ 10
11.1. Normative References.................................. 10
11.2. Informative References................................ 10
Authors' Addresses ............................................ 11
Dunbar-Kumari-Gashinsky Expires June 11, 2013 [Page 2]
Internet-Draft Pratices to scale ARP/ND in large DC
1. Introduction
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 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, this can lead to
address resolution scaling issues, especially on the L2/L3
boundary routers.
This draft documents some simple practices which can scale
ARP/ND in data center environment.
2. Terminology
This document reuses much of terminology from [ARMD-
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