What is a Tagged or Untagged port on 3COM 4200G

Posted on 2009-04-17
Last Modified: 2013-11-16
i'm a junior system administrator, I have to configure 2 vlans in a 3COM 4200G of 48 ports, I have already set ip address for vlan interf.1 and created vlan2 with its ip interface. One network is and other is, also in Vlna1 , port 1 is the uplink to a cisco router. The thig is what is a tagged port or untagged port, i want to communicate pcs from vlan 1 with vlan2 but if i set ports to tagged the pc cannot ping. Sumarizing what do i have to do? And whats a tagged port for?
Thanks in advance.
Question by:Deivishome
    LVL 9

    Accepted Solution

    A tagged port (in most cases) is utilized to encapsulate or trunk VLAN traffic.  For instance - if your switch were connected to another switch say in a different building.  And if you wanted to have your 2 VLAN's in both building.  On the link that connected the 2 switches you would configure as tagged in both VLAN's.  All the other ports connecting to PC's and such would be untagged.  So in essence you would be "tunneling" both VLAN's over a common link.  The tags are then stripped when the data egresses an untagged port.

    In your case all ports should be untagged.

    Expert Comment

    But if you keep all ports of the VLAN untagged on both switches, and you make 2 connections between the switches (one between each untagged VLAN), should it work?

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