From: Andrew B. Caslow (abcaslow@netmasterclass.net)
Date: Mon Jul 12 2004 - 13:49:05 GMT-3
Tiun,
Here is a NetMasterClass Tech-Note describing the purpose and application of
the Voice VLAN:
http://www.netmasterclass.net/site/articles/Voice%20VLAN,%20dot1q%20and%20do
t1p%20encapsulations.pdf
For other CCIE level Tech-Notes, check out:
http://www.netmasterclass.net/site/lib.php
HTH,
-Bruce Caslow CCIE #3139
NetMasterClass, LLC
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of TiuN
Hong Leng
Sent: Monday, July 12, 2004 12:16 PM
To: ccielab@groupstudy.com
Subject: Purpose of voice VLAN
Hi,
Could somebody kindly explain the purpose of Voice VLAN for me?
When a IP phone attatch to a switch port, this port should be trunk port.
Therefore, the voice traffic comming from the IP phone should be tagged
in 802.1q frames. Then why we still need a voice VLAN?
Is it for overriding the "VLAN ID"?
And then, why is there a command "switchport voice vlan dot1p"? What
does switch actually do when we enter this command?
These confused me for a long time, hope somebody can help me to clarify.
Thanks a lot!
H.L. Chang
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