Balancing oversubscription on the access layer

Posted on 2007-10-09
Medium Priority
Last Modified: 2008-02-01
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!!
Question by:Petrofac_ITlogmein
1 Comment
LVL 12

Accepted Solution

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.

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Data center, now-a-days, is referred as the home of all the advanced technologies. In-fact, most of the businesses are now establishing their entire organizational structure around the IT capabilities.
This article will show how Aten was able to supply easy management and control for Artear's video walls and wide range display configurations of their newsroom.
There's a multitude of different network monitoring solutions out there, and you're probably wondering what makes NetCrunch so special. It's completely agentless, but does let you create an agent, if you desire. It offers powerful scalability …
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…
Suggested Courses

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question