What is the difference between an untagged port and a tagged port?

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What is the difference between an untagged port and a tagged port ? when can I using them & what is the benefit?
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MUNIR ENG

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Posted 3 years ago

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David Coglianese, Embassador

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Vlans should be tagged on switch to switch links. 

Untagged will determine the dhcp address you get back from the server.

Tagged is also good for your elrp vlan. We tend to run a vlan called No_loop on tagged on all ports and use it for our elrp config.
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Drew C., Community Manager

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MUNIR ENG

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thank you
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Ryan Mathews, Alum

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MUNIR ENG

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great , just i need know What is the function untagged, with what use, witch the benefit ? 
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David Coglianese, Embassador

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End user devices will need to be on an untagged vlan to get to the internet.
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Bruce Garlock

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I think you also need to 'untag' the native vlan (not default vlan) on any trunk ports.
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Erik Auerswald, Embassador

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Using a "native VLAN" on a trunk means not tagging this VLAN. This is not needed for Extreme EOS nor ExtremeXOS. I would recommend to tag every VLAN on any inter-switch-link. Note that some special configurations (e.g. RSTP on EXOS) do require a native VLAN, but those situations can usually be avoided (e.g. using MSTP instead of RSTP).
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Rodrigo Azevedo

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thanks o/
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Drew C., Community Manager

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hafiz

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this is what I actually do:

Tagged = T = trunk for VLAN
Untagged = U = untrunk = switchport for VLAN
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Bin, Employee

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Hi,

Another post for Tag and Untag
What are tagged and untagged ports?
https://gtacknowledge.extremenetworks.com/articles/Q_A/What-are-tagged-and-untagged-ports/?q=tag+vla...

Best regards,