Tagged VLANS

Posted on 2011-10-28
Last Modified: 2012-05-12
Hi All,

I am relatively new to VLANS although I have a good understanding of how they work.

However I don't know anything about VLAN tagging.

There are some ports here that are tagged to treat traffic from VOIP devices differently to that for "Data", this has been done on Extreme X450 switches, can anyone tell me how the switch determines which traffc is from which device.

Most PC's are "piggybacked" from the phones but the switches know that the PC  is on one VLAN and and Phone on another....

Question by:techmiss
    LVL 26

    Accepted Solution

    In most cases the phone is tagging its traffice and the pc port is not tagged. Thus the switch knows which device belongs to which vlan. The interface on the switch is essentially a dot1q trunk.

    Author Closing Comment

    Yes, found the VLAN ID set on the phone.

    Many thanks

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    New My Cloud Pro Series - organize everything!

    With space to keep virtually everything, the My Cloud Pro Series offers your team the network storage to edit, save and share production files from anywhere with an internet connection. Compatible with both Mac and PC, you're able to protect your content regardless of OS.

    Outsource Your Fax Infrastructure to the Cloud (And come out looking like an IT Hero!) Relative to the many demands on today’s IT teams, spending capital, time and resources to maintain physical fax servers and infrastructure is not a high priority.
    Data center, now-a-days, is referred as the home of all the advanced technologies. In-fact, most of the businesses are now establishing their entire organizational structure around the IT capabilities.
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
    Here's a very brief overview of the methods PRTG Network Monitor ( offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

    758 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    13 Experts available now in Live!

    Get 1:1 Help Now