Supporting VLANs on the end host u Supporting multiple groups at the router 5

Supporting vlans on the end host u supporting

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Supporting VLANs on the end host u Supporting multiple groups at the router 5 CSE 222A – Lecture 9: L2 in the Data Center
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Complex Configuration Host address assignment u Wasting IP addresses u Complex host address assignment u E.g., doesn’t work with Wednesday’s idea Spanning tree computation u Limitation of automated trunk configuration u Enabling extra links to survive failures u Distributing load over the root bridges 6 CSE 222A – Lecture 9: L2 in the Data Center
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PortLand Discussion What are the challenges? How might you address them? What does PortLand do? What’s left? 7 CSE 222A – Lecture 9: L2 in the Data Center
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The Case for Optics 8 Electrical Packet Switch $400/port 10 Gb/s fixed rate 12 W/port Requires transceivers Per-packet switching For bursty , uniform traffic Optical Circuit Switch $400/port Rate free 240 mW/port No transceivers 1-ms switching time For stable, pair-wise traffic CSE 222A – Lecture 9: L2 in the Data Center
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For Next Class… Read Helios paper Work on project proposals u Details available on Project page in course Website 9 CSE 222A – Lecture 9: L2 in the Data Center
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  • Fall '08
  • Vahdat,A
  • IP address

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