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Truth = f(t)<br>
<br>
Originally switches required the interface be configured as a trunk.
This is the only way the switch would allow tagged packets over the
interface. Later on switch code was changed to allow untagged data and
tagged voice on a interface this was not defined as a trunk.<br>
<br>
So most everyone is right, depending on which version of switch code
you are on.<br>
<br>
/Wes<br>
<br>
Jonathan Charles wrote:
<blockquote
cite="mid5d093f9a0603310808s5efc2a8awd19d1fd1c80fcbd3@mail.gmail.com"
type="cite">
<pre wrap="">Wow.
This is kind of surprising that so many voip engineers are making this mistake.
The voice vlan is NOT supported (and does not work correctly) on ports
configured as trunks.
For the 3560:
<a class="moz-txt-link-freetext" href="http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12225see/scg/swvoip.htm">http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12225see/scg/swvoip.htm</a>
"Voice VLAN is only supported on access ports and not on trunk ports,
even though the configuration is allowed."
For the 3750:
<a class="moz-txt-link-freetext" href="http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12225see/scg/swvoip.htm">http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12225see/scg/swvoip.htm</a>
"Voice VLAN is only supported on access ports and not on trunk ports,
even though the configuration is allowed."
While you may have gotten it to work, it is not consistent...
Jonathan
On 3/31/06, Rupp Christian <a class="moz-txt-link-rfc2396E" href="mailto:Christian.Rupp@etavis.ch"><Christian.Rupp@etavis.ch></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi Peter!
We use this configuration that works:
interface FastEthernet0/3
switchport trunk encapsulation dot1q
switchport trunk native vlan yy
switchport voice vlan xx
!
Is the DHCP Server for the voice vlan the same like the PC vlan?
Maybe you have to configure a helper-address?
Regards,
Christian
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