tagged vs. untagged VLAN

Brandon Kim brandon.kim at brandontek.com
Wed Sep 29 01:51:10 UTC 2010

I'd think that going with two tagged VLAN's is the better route. You will then be forcing the customer
to adhere to the VLAN's that you have specified and reserved for them.

It's also a security advantage because if you go with untagged, who knows if someone might be able
to vlan hop/double tag their way into someone elses network....

> Date: Tue, 28 Sep 2010 21:27:32 -0400
> Subject: tagged vs. untagged VLAN
> From: zeusdadog at gmail.com
> To: nanog at nanog.org
> In a SP environment, you need to hand off two VLANs to a customer, is
> there any advantage or disadvantage in doing the following two setups?
> - One untagged and one tagged VLAN
> - Two tagged VLAN and no untagged VLAN
> I can't think of anything other than some equipment may not let you
> have no untagged VLAN.  But it's bugging me that something could go
> wrong by not having untagged native VLAN that I can't think of.

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