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gigabit network design

I have a gigabit networking design question.  In a top-of-rack 48-port gigabit switch design, does the gigabit fiber uplink to the core switch become a bottleneck for the servers in that rack? Should the uplink be 10G?  The servers are file, print, backup, and email servers.
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Yes. Any uplink that is the same speed as all the other interfaces will become a bottleneck.
A switch full of 10/100 interfaces should have a gigabit uplink
a switch full of gigabit interfaces should have a 10G uplink
You really need to know your traffic.  As a rule of them, lrmoore is correct.  If you really need gigabit connections to your severs, then you need to have more that a gigabit uplink.

However, you might be able to get by with four 1 Gbps connections in "Cisco like Etherchannel".  This would give you just about 4 Gbps and redundency.  It depends on what your peak network traffic needs are.

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