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Need to Build a CLOS (Leaf and Spine) for Hadoop Cluster

Have a vendor that is proposing a very robust architceture to support our Hadoop cluster project of 3,000 servers. It is a leaf and spine architecture that uses high-density fixed configuration switches with routed links between leaf and spine - no L2. Think of a CLOS built with pizza box switches. Its a 3:1 os ratio between leaf and spine - every leaf has a routed uplink to every spine.

What does Cisco have to counter that?? I was thinking of FEXs to stay cheap, but they cant be used because they dont scale out like that anyway, plus its L2 between the FEX and parent Nexus. The Nexus 3064 is way too expensive and purpose built for ultra low latency anway.

All I can think of are 5596s at the leaf and spine with the L3 module of course - that would give 80 ports: 60 going south for the servers and 20 north toward the spines.

Any alternatives???

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