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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Actually, layer 2 QoS (a.k.a CoS settings)
are in the 802.1q header. Layer 3, (DSCP or PHB bits), are the 5 in the IP
Precedence field. If your not using 802.1q, your not using layer 2 CoS.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The reason you see switch configs that are
not set for full trunking and instead have command sets like:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Interface fa0/1<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> switchport dynamic desirable
</span></font><font size=2 color=navy face=Wingdings><span style='font-size:
10.0pt;font-family:Wingdings;color:navy'>ß</span></font><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> negotiates a quasi-trunk<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> switchport voice vlan 100<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> switchport access vlan 200<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> spanning-tree portfast<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Is because the newer voice enabled
switches are smart enough to understand the voice vlan information and respect
the tags coming down from the phone, and there are still 802.1q tags, even
though you have not configured a true trunk. As I said, the phone does
insert an 802.1q header and tags appropriately, but the port is not in a true
trunking mode. The reason for this, is the new config keeps a lot of
trunking management protocols off the port and frees it up for voip traffic = efficiency.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Older switches were configured as full
trunks and you might still see that out there.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>interface FastEthernet0/1 </span></font><font
size=2 color=navy face=Wingdings><span style='font-size:10.0pt;font-family:
Wingdings;color:navy'>ß</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> true trunking config<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> switchport trunk encapsulation dot1q<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> switchport trunk native vlan 100
</span></font><font size=2 color=navy face=Wingdings><span style='font-size:
10.0pt;font-family:Wingdings;color:navy'>ß</span></font><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> data and untagged vlan<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> switchport mode trunk<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> switchport voice vlan 200 </span></font><font
size=2 color=navy face=Wingdings><span style='font-size:10.0pt;font-family:
Wingdings;color:navy'>ß</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> tagged 802.1q header with
the phone inserting layer 2 CoS and layer 3 DSCP tags<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> spanning-tree portfast<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>These configs accomplish the same thing,
but the “newer” switches config is much more efficient.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Joe<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b><span
style='font-weight:bold'>On Behalf Of </span></b>ash AD<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, June 06, 2006 5:07
PM<br>
<b><span style='font-weight:bold'>To:</span></b> Wydra, Jason;
cisco-voip@puck.nether.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [cisco-voip] General
QOS question</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Jason, <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> Trunking is not required to set QoS DSCP or <st1:place
w:st="on">COS</st1:place> settings. Those markings are not found in the ISL or
802.1q header; they are found in the ToS byte of the IP header. When
Cisco IP phones encapsulate the voice bearer traffic within the IP
packet they set the ToS byte by default to the EF QoS value. Most people
allow Cisco switches to trust this value and not remark the VoIP packet. <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Peter<br>
<br>
<b><i><span style='font-weight:bold;font-style:italic'>"Wydra, Jason"
<jwydra@Burwood.com></span></i></b> wrote:<o:p></o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>If you don’t turn on trunking for an IP phone switch
interface, then how is COS set and/or recognized on ingress?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><strong><b><font size=3 color=green face="Times New Roman"><span
style='font-size:12.0pt;color:green'>Jason Wydra</span></font></b></strong><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><strong><b><font size=1 color=green face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:green'>Consultant</span></font></b></strong><strong><b><font
size=1 color=green face="Times New Roman"><span style='font-size:8.0pt;
color:green'><o:p></o:p></span></font></b></strong></p>
</div>
<div>
<p class=MsoNormal><strong><b><font size=1 color=green face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:green'>burwood</span></font></b></strong><font
size=1 face=Arial><span style='font-size:9.0pt;font-family:Arial'> <strong><b><font
face=Arial><span style='font-family:Arial'>group, inc.</span></font></b></strong></span></font><font
size=1><span style='font-size:9.0pt'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><strong><b><font size=1 face=Arial><span style='font-size:
8.0pt;font-family:Arial'>Phone: (312) 327-4677</span></font></b></strong><strong><b><font
size=1 face="Times New Roman"><span style='font-size:8.0pt'><o:p></o:p></span></font></b></strong></p>
</div>
<div>
<p class=MsoNormal><strong><b><font size=1 face=Arial><span style='font-size:
8.0pt;font-family:Arial'>Cell: (312) 493-2834</span></font></b></strong><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt'><a href="mailto:jwydra@burwood.com">jwydra@burwood.com</a><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>_______________________________________________<br>
cisco-voip mailing list<br>
cisco-voip@puck.nether.net<br>
https://puck.nether.net/mailman/listinfo/cisco-voip<o:p></o:p></span></font></p>
</blockquote>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=1 width="100%" align=center>
</span></font></div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>New Yahoo! Messenger with Voice. <a
href="http://us.rd.yahoo.com/mail_us/taglines/postman5/*http:/us.rd.yahoo.com/evt=39666/*http:/messenger.yahoo.com">Call
regular phones from your PC</a> and save big.<o:p></o:p></span></font></p>
</div>
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