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Balancing oversubscription on the access layer

Posted on 2007-10-09
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So, the situation is that we have about 240 users (max, no further expansion to this figure in the future) on each floor of a building, spanning across 10 floors. As I understood from the basic calculation, for every 240 users @ 100/1000, I need to deploy five, 48 port stacked switches within each IDF on each floor) (5x48) will share 2x1GigE uplinks(etherchannel) terminated into two different cores with a redundant 2x1G uplink (passive).

Someone tells me that this will result in an oversubscription ratio of 120:1 in the best case scenario when we, ever fully utilize both 2x1G uplinks in an active/active setup. Is this ratio unacceptable at access layer?

Should I consider dual 10GigE uplinks from the access layer (IDF) to core, to start with, irrespective?

I currently am working with 1G uplinks and don't see any major hassles. My applications though utilise 3D and CAD drawings but I still feel that 2-4Gig uplink would be more than sufficient for me as I can link aggregate further upto 8Gigs using Cisco Cat 3750E.

Should we go for 10Gig uplink straightway?
Your thoughts!!
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Question by:Petrofac_ITlogmein
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Freya28 earned 1500 total points
ID: 20044082
i would stay with the current configuration.  240 users over those switches is suffice.  IF you do start to see performance issues, first run a protocol anaylzer like wireshark, formerly etherreal, to determine what traffic is traversing the network.  at the very worst you can always upgrade the uplinks later as long as those switches support 10 gig GBIC.  but i highly doubt that in your situation yyou would need to run that.
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