Requirement for router in VLAN'd network

I am upgrading my school's computer network to enable telephony on the network.  I have upgraded my three switches to Cisco SG-220-50p to give me PoE and better management.  I am implementing VLANs (public, staff, students, voice)  to segregate traffic, provide QoS, etc.  An IT consultant advised me to purchase these L2 switches and that I would not need a router on my network because I have no need for inter-VLAN connectivity.

That consultant has moved on and I am in the process of configuring the network with the aid of another consultant.  This one is telling me that I need a router or L3 switch to allow each of the VLANs to access the gateway.  So, I am looking at the Cisco SG300-10.

If it matters to this question I also have a Sonicwall NSA-220.

I am looking for advice on which direction is right.

Thanks in advance
Ken HerrIT DirectorAsked:
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Juan OcasioApplication DeveloperCommented:
We have a similar setup at my office, but use C2960x switches and the work great.  We have three VLANs: Private network, guest, and voice
Ken HerrIT DirectorAuthor Commented:
jocasio, do you have a router or not?
Juan OcasioApplication DeveloperCommented:
Yes, sorry. We have a C1941 router. We had a sonic wall, but got rid of it. We have many remote sites still using the sonicwall, but are slowly moving away from them
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Most routers allow you to create sub-interfaces where each sub-interface will have IP addressed assigned for each of your VLANs and will allow you to router between VLANs.  If your router doesn't support it then you would require a layer-3 switch to do the routing for you.   Any Cisco router should do.
Ken HerrIT DirectorAuthor Commented:
We don't have a router or L3 switch.  The first IT consultant said the he could configure our L2 'smart switches' so that we didn't need a router (unless we were doing inter-VLAN).
SonicWALL X0 interface can be configured as subinterfaces to InterVLAN routing for you what we call "Router-on-a-stick".
I have them running on 20+ sites. If you require, I can provide step by step instructions.
Ken HerrIT DirectorAuthor Commented:
I would be very interested in seeing the instructions.
kherr at quakertownchristian dot org
This example network has following devices connected.
•      Switch - SG200-26P 26-Port
•      Router – SonicWALL TZ210
DiagramSonicWALL X3 interface connects to the GE1 interface of the switch.
The switch port GE1 that connects to SonicWALL is configured Untagged for Data VLAN and Tagged for Voice VLAN. For me, it looks like (1UP, 10T)
SwitchOn the SonicWALL, X3 interface, we configure virtual interfaces like below.
SonicWALL LAN InterfacePlease let me know if you need more info.

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Ken HerrIT DirectorAuthor Commented:
If I could give triple points, I would.  Thank you to an expert who fully read, understood the question, and answered it spot-on.  Thank you
Thank you for the points.
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