Balancing oversubscription on the access layer
Posted on 2007-10-09
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?