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<TITLE>Re: [cisco-voip] Simple VOIP question: Switch related</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Do you have CDP enabled on the switch? Cisco phones use CDP voice vlan functionality.<BR>
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Matt<BR>
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On 7/22/08 1:00 PM, "Jeff Cartier" <<a href="jcartier@acs.on.ca">jcartier@acs.on.ca</a>> wrote:<BR>
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I’m having the worst time trying to figure out a problem.<BR>
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The issue is that a 7912 phone seems to be getting an IP address in the data subnet. We’ve tried two configurations on the switchport level and neither are working…<BR>
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Interface fa0/1<BR>
switchport mode access<BR>
switchport voice vlan 2<BR>
srr-queue bandwidth share 10 10 60 20<BR>
priority-queue out<BR>
mls qos trust cos<BR>
auto qos voip trust<BR>
spanning-tree portfast<BR>
<BR>
AND/OR<BR>
<BR>
Interface fa0/1<BR>
Switchport mode trunk<BR>
switchport trunk encapsulation dot1q<BR>
switchport voice vlan 2<BR>
srr-queue bandwidth share 10 10 60 20<BR>
priority-queue out<BR>
mls qos trust cos<BR>
auto qos voip trust<BR>
spanning-tree portfast<BR>
<BR>
And yet the phone keeps receiving an IP address in the data subnet.<BR>
<BR>
We’ve verified the following:<BR>
- helper-address on the router<BR>
- correct DHCP scope<BR>
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<BR>
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