Routing Design for Large Scale Data Centers: [PDF]
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Routing Design for Large Scale Data Centers: [PDF]
Page 1. Global Networking Services Team, Global Foundation Services, Microsoft Corporation. Routing Design for ... Aware of the network. Explicit parallelism.
Routing Design for Large Scale Data Centers:
Global Networking Services Team, Global Foundation Services, Microsoft Corporation
2
Problem Statement
3
100’s thousands of servers 10G NICs Aware of the network Explicit parallelism Example: Web Index computation
4
Query Background
Query
Background
5
The simpler the better
Single protocol Simple behavior Wide vendor support
6
What We Started With
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Folded on diagram
ECMP Based 8
9
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Why BGP over IGP
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Better vendor interoperability Less state-machines, data-structures etc Use for unequal-cost Anycast load-balancing solution
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BGP RIB structure is simpler compared to link-state LSDB Clear picture of what sent where (RIBIn, RIBOut)
E.g. link failures have limited propagation scope More stability due to reduced event “flooding” domains
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Not a problem with automated configuration generation
Is not our primary goal anyways, few seconds are OK Practical convergence in less than a second
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The New Approach
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Broadcast storms Hard to troubleshoot
Bandwidths scales up, and not out 16
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No need to buy higher-radix boxes Cheaper infrastructure
No interworking/redistributions etc
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Details and Design Choices
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We rely on ECMP for routing Needed for Anycast prefixes
Simplifies path hiding at WAN edge (remove private AS) Simplifies route-filtering at WAN edge (single regexp)
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Allow AS in
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AS_PATH Multipath Relax Allow AS In Fast eBGP Fall-over Remove Private AS
