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 '16 at 12:42
  • I know it's just for an example, but avoid using Vlan 1 on Catalysts.
    – rnxrx
    Dec 9 '16 at 14:04

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 '16 at 11:39
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    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 '16 at 11:46
  • run out of subnets? or what is your biggest problem with that network?
    – horasz
    Dec 9 '16 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 '16 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 '16 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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