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Overlapping VLANs?

  • LAN
  • Networking
Last response: in Networking
September 21, 2012 8:40:33 PM

I'm working with a 3com baseline switch2948-sfp plus switch and I'm wondering if it is even possible to create overlapping VLANs.

Its setup page just has untagged, tagged, and not a member selections.

Certain departments only need to see 1 of the 4 fileservers to work from, but some of the management needs to see all 4 of them.

Is it possible to have a setup like this

Users are Ports 1-20 Servers are Ports 21-25

1,2,3,4 21, 25

5,6,7,8 22, 23, 25

9, 10, 21, 22, 23, 24, 25

11, 12 21, 24, 25

As you can see everyone needs server 25 and there is overlapping for the rest.

More about : overlapping vlans

September 21, 2012 10:00:11 PM

If you were to define your servers with tagged ports and define multiple virtual interfaces you could do this. You would for example create 4 interfaces for server 25.

Not a recommended design it tends to be pain to keep straight.

The more common design is to place all the servers in a different vlan and then use rules to restrict the traffic.

September 24, 2012 5:00:55 AM

I will have to try that. Thanks

There are only 4 servers actually. and 15 users so it it won't be confusing.