VLANs on L2 switches?

Question

linux

Hello everyone)
I have such a network in my office (gigabit)

[COLOR="Blue"]Managers
[COLOR="Red"]Architects\Designers
[COLOR="Green"]Call centers
Online 70+ PCs\laptops\tablets
Very simplified of course.
There is also ip-telephony, its own PBX, CD, a duplicate CD on which virtual machines with Apaches and other stray.
VPNs were forwarded from the router to CD, RDP, etc.
It is necessary to separate VLANs Architects\Designers Managers and Call Centers from each other but (!) so that they can ping i.e. scatter them into different octets of the same network through Vlan and then glue the whole thing on the router so that they can exchange packets in different Vlans.
Question: Will it increase productivity for different departments.
Those. Will the channel reduce the load? the call center clogs the network with calls, architects / designers throw off constantly large files, visit the File Dump, will they stop interfering with each other? : Olen ': file dump (aka CD) it's natural to put one vlan from Architects\Designers, and ATC-ku, for example, to Vlan to the call center
If necessary, I can draw a full-fledged network with all "stupid" switches and routers that work in "only wifi mode" and severers

Answer 1

Those. Will the channel reduce the load? the call center clogs the network with calls, architects / designers throw off constantly large files, visit the File Dump, will they stop interfering with each other?

- No. physically, the route to the PBX/file dump will remain the same.
Now, if you stick the same file dump into the designer's switch, then they will clog the common channel less. Well, it will be so without vlans.
I would say that VLANs will even increase the load on the network - because. all data flows between subnets will go through the router (i.e. through 1 of its interfaces)

Answer 2

Question: Will it increase productivity for different departments. - possibly.
But it will be possible to configure qos on the router - this will increase stability. Well, control of broadcast messages, which increases the bandwidth available to the user.
How many operators do you have that clog the Gb channel via VOIP?
And the network is 100Mb! Uplink-1Gb on switches.