What is the difference between untagged and tagged port ?

Posted on 2013-09-02
Medium Priority
Last Modified: 2013-09-02
Hi there,
Please, What is the difference between untagged and tagged port ?
Question by:simlip
LVL 15

Expert Comment

ID: 39458438
A untagged ethernet interface is a interface for untagged traffic i.e. a printer or workstation

A tagged port can accept tags form the connected hardware i.e. a uplink (trunk) to another switch with more vlans.

A tagged port can be a memer of more vlan's
A untagged port can be only a member of 1 vlan.

I hope this clears thing up....

Taken from:

LVL 17

Expert Comment

ID: 39458447
In  short, a tagged port is a trunk port. It actually tags all the passing traffic so that traffic pertaining to a particular vlan is never lost. As you know, trunk port carries traffic from different vlans, so they need tagging to be identified at the remote end so that they are segregated properly.

A switch port, which belong to a single vlan is untagged port, because it will pass traffic for one and only one vlan only. Hence no tagging required. So untagged.

LVL 24

Accepted Solution

aadih earned 2000 total points
ID: 39458454
Generally, a tagged port is a trunk port, that is, multiple VLANS exist on that port. Each VLAN gets an ID (tag) when there are multiple VLANs on a port to separate traffic from these VLANS. The ports that belong to only one VLAN, there is no need for tagging, hence they are called untagged ports.

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