Setting up VLANs

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    Finally getting around to breaking up our flat network into some VLANs and have a question on what (if anything) I need to do to allow clients to use our router to access the Internet.

    Current config is a flat network, every device is on the same subnet (, and every client has our router setup as the default gateway.

    Proposed is to implement VLANs, give each VLAN it’s own subnet (,, etc), and use our core Layer 3 switch to route traffic between the VLANs. Clients would use the corresponding VLAN IP of the core switch as their gateway.

    Since we have a fairly large network we plan on implementing the VLANs gradually, which means keeping the old around until all VLANs and IP changes are done. Do we need to add a something on the router or another route on the core switch?

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