In your setup, you dont need a subinterface. The baseline is: You need a layer3 device for communication between different vlans.
If you have a Layer2 switch with multiple vlan and a single router connected, you need sub interfaces with dot1q encapsulation.
For EX: A switch have vlan 1 and vlan 2 configured with trunk port connecting to router. On the router side, 2 subinterface (for each vlan) will be configured with respective ip address from the vlan subnet.
When the switch receives a frame from VLAN 1 destinated to VLAN2, it will flood the same as the destination is unknown. The router on receiving it, will look into the destination address and will encapsulate with vlan details(VLAN2 in this case) in layer 2 header and forward the same to switch.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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