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Use of BGP for routing in large-scale data centers
draft-lapukhov-bgp-routing-large-dc-07

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Last updated: 2014-02-06
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Network Working Group                                        P. Lapukhov
Internet-Draft                                                  Facebook
Intended status: Informational                                 A. Premji
Expires: August 10, 2014                                 Arista Networks
                                                        J. Mitchell, Ed.
                                                   Microsoft Corporation
                                                        February 6, 2014

           Use of BGP for routing in large-scale data centers
                 draft-lapukhov-bgp-routing-large-dc-07

Abstract

   Some network operators build and operate data centers that support
   over one hundred thousand servers.  In this document, such data
   centers are referred to as "large-scale" to differentiate them from
   smaller infrastructures.  Environments of this scale have a unique
   set of network requirements with an emphasis on operational
   simplicity and network stability.  This document summarizes
   operational experience in designing and operating large-scale data
   centers using BGP as the only routing protocol.  The intent is to
   report on a proven and stable routing design that could be leveraged
   by others in the industry.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on August 10, 2014.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Lapukhov, et al.         Expires August 10, 2014                [Page 1]
Internet-Draft     draft-lapukhov-bgp-routing-large-dc     February 2014

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Network Design Requirements . . . . . . . . . . . . . . . . .   4
     2.1.  Bandwidth and Traffic Patterns  . . . . . . . . . . . . .   4
     2.2.  CAPEX Minimization  . . . . . . . . . . . . . . . . . . .   4
     2.3.  OPEX Minimization . . . . . . . . . . . . . . . . . . . .   5
     2.4.  Traffic Engineering . . . . . . . . . . . . . . . . . . .   5
     2.5.  Summarized Requirements . . . . . . . . . . . . . . . . .   5
   3.  Data Center Topologies Overview . . . . . . . . . . . . . . .   6
     3.1.  Traditional DC Topology . . . . . . . . . . . . . . . . .   6
     3.2.  Clos Network topology . . . . . . . . . . . . . . . . . .   7
       3.2.1.  Overview  . . . . . . . . . . . . . . . . . . . . . .   7
       3.2.2.  Clos Topology Properties  . . . . . . . . . . . . . .   8
       3.2.3.  Scaling the Clos topology . . . . . . . . . . . . . .   9
       3.2.4.  Managing the Size of Clos Topology Tiers  . . . . . .  10
   4.  Data Center Routing Overview  . . . . . . . . . . . . . . . .  10
     4.1.  Layer 2 Only Designs  . . . . . . . . . . . . . . . . . .  11
     4.2.  Hybrid L2/L3 Designs  . . . . . . . . . . . . . . . . . .  11
     4.3.  Layer 3 Only Designs  . . . . . . . . . . . . . . . . . .  12
   5.  Routing Protocol Selection and Design . . . . . . . . . . . .  12
     5.1.  Choosing EBGP as the Routing Protocol . . . . . . . . . .  13
     5.2.  EBGP Configuration for Clos topology  . . . . . . . . . .  14
       5.2.1.  Example ASN Scheme  . . . . . . . . . . . . . . . . .  14
       5.2.2.  Private Use BGP ASNs  . . . . . . . . . . . . . . . .  15
       5.2.3.  Prefix Advertisement  . . . . . . . . . . . . . . . .  16
       5.2.4.  External Connectivity . . . . . . . . . . . . . . . .  17
       5.2.5.  Route Summarization at the Edge . . . . . . . . . . .  18
   6.  ECMP Considerations . . . . . . . . . . . . . . . . . . . . .  19

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