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Re-Design Network with InterVLAN Routing

Hey guys,

i have a question more about designing a VLAN network.

Our customer has a /16 network with roundabout 1500 devices and 90 Cisco switches. All devices are in VLAN 1 in subnet 192.168.0.0/16.

Now its my part to Re-Design this network in different VLANS

Now my question how would you do it, which method is the best?

I thought the core stack switch WS-C3850-48P activate IP Routing and handle Inter VLAN routing. For all devices actually is Sophos UTM SG 430 the default Gateway 192.168.1.1 

This IP will give the new core switch to handle requests. Then configure Sophos UTM as Gateway for core switch

In first step we can disregard security reason, ACL´s and security come in next step between VLAN´s

What do you think about this method?

Regards Marco