A Cisco IP Phone (794X/796X/707X, etc.) plugged into a newer Catalyst switch will automatically (via CDP) negotiate the dot1Q trunk (it is doing it in the background, so you will not see it).<br><br>We have noticed with the 7935 and 7936 conference phones (built by Polycom) that sometimes (depending on firmware version) they cannot do a trunk (since they don't have an access port, there really is no need), so it is easier just to nail them in as access ports on the voice vlan.
<br><br>I would recommend your first option, just to match with the SRND. The second option is really for non-Cisco IP phones (which cannot negotiate the trunk).<br><br><br><br>Jonathan<br><br><div><span class="gmail_quote">
On 11/24/06, <b class="gmail_sendername">Ruben Montes (Europe)</b> <<a href="mailto:Ruben.Montes@eu.didata.com">Ruben.Montes@eu.didata.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>
<p>Hello,</p>
<p>I have always configured the switch IOS ports where IP phones are connected
this way:</p>
<p>int fa0/1</p>
<p>switchport access vlan DATA</p>
<p>switchport voice vlan VOICE</p>
<p>switchport mode access</p>
<p>spanning-tree portfast</p>
<p> </p>
<p>But I've seen in the CCVP courses that the configuration is
different:</p><font face="Helv" size="2">
<p>interface fastethernet 0/1</p>
<p>switchport trunk encapsulation dot1q</p>
<p>switchport trunk native vlan DATA</p>
<p>switchport mode trunk</p>
<p>switchport voice vlan VOICE</p>
<p>spanning-tree portfast</p>
<p>Can anybody explain me the differences between them and if any of them
have any advantage respect the other one? I prefer the first one rather than the
second, I don't like to configure a trunk to connect a phone, but I want to
understand why Cisco recommends the second configuration respect the first
one?</p>
<p>Thanks in advance,</p>
<p>Ruben</p></font></div>
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