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Router & Cisco catalyst 2950 managed by the ISP: can I use VLANs with a SG300 switch?

Hello,

Our router is located at the ISP level. In our server room, we have a cisco catalyst 2950 switch that is also managed by our ISP (we don't have access to it).

Our project is to create 2 VLANs. I already set up a test environment with

- a windows server that is acting as DHCP server

- a SG300-52 switch with 2 VLANs

- a second cisco SG200-52 for the second VLAN

In my test environment, everything is working fine. I also tested with a third VLAN and can get IPs from the windows DHCP server.

I also have access to the internet by using a router that is apart of our LAN, that purpose is to give from time to time wifi access to guests. It is a simple zyxel router butI had to configure static routes on it for each VLAN (I don't understand why).

I have 2 questions about this setup:

1) do we need access to the router and switch provided by our ISP to use VLANs or plugin our SG300 switch (configured with VLAN, routing, as I already did) into the ISP switch will be enough? How should I do and why?

2) I didn't understood why I had on my test environment to set back routes on the zyxel router to get access to internet as intervlan is working on the SG 300: I though that the zyxel router would only forward the traffic to the SG300 switch and that this switch, with routing working, would do the job alone.

Thank you

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