As I sit here considering products to further implement into my company's network and looking into new designs I have to take into consideration bandwidth utilization averages of our current switches. I say I must consider this because the price of Cisco products go much higher when talking about gigabit technology as opposed to 10/100 Mbps switches.
What I want to specifically speak on are Access Layer switches, or end user switches. As I study more and more into Cisco, I begin to think back on some of the purchases I made on behalf of my company and I kinda begin to see where I may have went wrong; for example, purchasing a 24-port 3560G for users who won't ever use half that bandwidth, especially when most of the traffic transmitted and received is out of one VLAN on one switch. What I mean is, I have a about 100 people across 7 locations accessing one server VLAN most of the time. I understand why I would need gigabit trunks, but for end users that may access the servers sporadically, gigabit ports don't make much sense. I see where I could have gotten away with using a 10/100 switch using gigabit uplink ports for end users.
Who are these end users and what type of applications or network setup would have to be put in place to justify purchasing a gigabit switch at the access layer?
I feel like for most flat networks, especially at the access layer, 10/100 would suffice for most people.
On one of my 48 port 3560G switches, which has the servers and some users on it and is fully populated, when I issue the "show controllers utilization" command, I see "0" all across the board.
Another test I performed to measure bandwidth utilization a port that connects to our busiest server, I did as follows.
"clear controllers utilization"
waited 8 seconds
"show controllers utilization"
What I got in the total transmit column was 19622194 Bytes which translates to roughly 150 megabits transmitted over 8 seconds. if I divde that by 8, I get roughly 18 megabits per second, nowhere close to full capacity of a port on a 10/100 switch.
I'm not sure if I'm going at this the wrong way, or if my measurements are off, but I hope I can get some good feedback from some of you guys regarding the implementation of gigabit switching. It could definitely save people a lot of money.
Thanks for listening, everyone.