Multipath routing through equal cost multipath Data centers often connect layer

Multipath routing through equal cost multipath data

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Multipath routing through equal-cost multipath Data centers often connect layer-2 islands by IP routers 7 CSE 222A – Lecture 8: Data Center Networks
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Advantages of Layer 2 Certain monitoring apps require server with same role to be on the same VLAN Using same IP on dual homed servers Allows organic growth of server farms VM migration is easier 8 CSE 222A – Lecture 8: Data Center Networks
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Layer 2 Pods w/L3 Backbone CR CR AR AR AR AR . . . S S DC-Layer 3 Internet S S A A A S S A A A . . . DC-Layer 2 Key CR = Core Router (L3) AR = Access Router (L3) S = Ethernet Switch (L2) A = Rack of app. servers ~ 1,000 servers/pod == IP subnet S S S S S S 9 CSE 222A – Lecture 8: Data Center Networks
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FAT Tree - Based Solution An all Layer-3 solution Connect end-host together using a “fat-tree” topology u Infrastructure consist of cheap devices » Each port supports same speed as endhost u All devices can transmit at line speed if packets are distributed along existing paths u A k-port fat tree can support k 3 /4 hosts 10 CSE 222A – Lecture 8: Data Center Networks
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“Fat - Tree” Topology 11 CSE 222A – Lecture 8: Data Center Networks
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Fat - Tree Challenges Layer 3 will only use one of the existing equal cost paths Packet re-ordering occurs if layer 3 blindly takes advantage of path diversity u E.g., ECMP 12 CSE 222A – Lecture 8: Data Center Networks
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  • Fall '08
  • Vahdat,A
  • IP address, Router, Network switch, Subnetwork

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