Can I make several VLANs in a typical Catalyst (for instance, Cisco C3640) that share the same addressing? For example: vlan 1 -> address in Fa0/0.1: vlan 2 -> address in Fa0/0.2:


  • Can you explain more about what you're trying to do? We might be able to find a way to accomplish your goal.
    – Ron Trunk
    Dec 9, 2016 at 12:42
  • I know it's just for an example, but avoid using Vlan 1 on Catalysts.
    – rnxrx
    Dec 9, 2016 at 14:04

2 Answers 2


If you want to use same adressing that means it will be one network you can not separate it two vlan.

  • ok, and is it possible to have two VLANs with just one subnet, and translating the tags in the switch without using IPs in the switch interfaces? Dec 9, 2016 at 11:39
  • 1
    The router is needed to the 2VLANs can communicate. One VLAN can use one subnet. 2 VLANs can't use the same subnet at the same time.
    – horasz
    Dec 9, 2016 at 11:46
  • run out of subnets? or what is your biggest problem with that network?
    – horasz
    Dec 9, 2016 at 11:47
  • Other people explained that they can do this in a machine equivalent to a Catalyst, but I couldn´t find the way to do it. I´ll ask them for a detailed explanation, and I´ll post it here again :) Dec 9, 2016 at 11:49
  • I learned about vlans from ccna routing and switching and i never seen same like that. Why it would be good? When you create 2 vlans, you do it because you want to separate two LANs from each other.
    – horasz
    Dec 9, 2016 at 11:54

You can not create saparate Vlans with same subnet , it is not feasible ..

To accomplish your requirement Configure different Vlans with different networks subnets .

And to ensure communication among this different VLANs Layer3 device is required to enable routing between different Vlans .

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