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what does 'if QoS was enabled' mean?<br>
cisco hardphones: set DSCP according to CM config barring a few defects<br>
cm: QoS is configurable depending on customer policy<br>
voice gateways: QoS configurable depending on customer policy<br>
what method of CAC is in use? GK, CM Locations, RSVP?<br>
switches: may or may not trust phones, but are you doing dot1q or dot1p
tagging to take advantage of L2 QoS? Are you trusting phone QoS?<br>
network: do the devices even support any type of QoS? 1q2T 2q2T.... are
their priority output queues? is it such high bandwith with such low
utilization that QoS is N/A? are firewalls, Border Elements, or
Proxies in use? Do those preserve ip prec or DSCP?<br>
what is the standard for QoS in the network? ip prec or DSCP? what QoS
classes are in use on the network? there are recommended defaults but
those do not have to be followed.<br>
are there soft clients in use? how is QoS designed and deployed for
those?<br>
<br>
The net is that QoS is 7 parts technical and 3 parts policy.<br>
<br>
Proper QoS depends on agreement between the policy and the
configuration of devices. <br>
<br>
the simple question unfortunately is not so simple.<br>
<br>
/wes<br>
<br>
On Tuesday, January 06, 2009 3:12:51 PM, Sean Walberg
<a class="moz-txt-link-rfc2396E" href="mailto:swalberg@gmail.com"><swalberg@gmail.com></a> wrote:<br>
<blockquote
cite="mid:cc43a8f80901061212k64d5950fydd1bd9a0929ba13b@mail.gmail.com"
type="cite">To be fair, he only asked how he could find out if QoS was
enabled or not. It pretty clearly is not, so he might be able to pass
the buck off to someone else :)
<div><br>
</div>
<div>Sean<br>
<br>
<div class="gmail_quote">On Tue, Jan 6, 2009 at 2:05 PM, Wes Sisk <span
dir="ltr"><<a moz-do-not-send="true" href="mailto:wsisk@cisco.com">wsisk@cisco.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000">
Hi John,<br>
<br>
There are many facets to QoS. I recommend you grab a six pack of
caffeine, a quiet room, and the QoS SRND.<br>
<br>
Regards,<br>
Wes<br>
<br>
On Tuesday, January 06, 2009 10:28:37 AM, Weigand, John V.
<a moz-do-not-send="true"
href="mailto:jvw@medicineforthedefense.com" target="_blank"><jvw@medicineforthedefense.com></a>
wrote:<br>
<blockquote type="cite">
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<p align="left"><img moz-do-not-send="true"
alt="Litigation Management" align="left" border="0" height="54"
hspace="0" width="279"></p>
</td>
<td height="90" width="36%">
<p align="right"><font color="navy" face="Verdana"><a
moz-do-not-send="true" href="http://www.medicineforthedefense.com/"
target="_blank"><font color="olive" face="Arial" size="2">Serious
Medicine for the Defense ®</font></a></font><font color="olive"
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<div>
<p><span
style="font-size: 11pt; color: rgb(31, 73, 125);"><font color="navy"
face="Verdana"><font color="black" size="2">Thanks so
much for everyone's input, it's very much
appreciated!</font></font></span></p>
<p><span
style="font-size: 11pt; color: rgb(31, 73, 125);"><font color="navy"
face="Verdana"><font color="black" size="2"> </font></font></span></p>
<p><span
style="font-size: 11pt; color: rgb(31, 73, 125);"><font color="navy"
face="Verdana"><font color="black" size="2">"show
policy-map" on both our voice and data routers
is returning with nothing, so I'm taking that to mean we don't have
any policies applied on those.</font></font></span></p>
<div class="Ih2E3d">
<p><span
style="font-size: 11pt; color: rgb(31, 73, 125);"><font color="navy"
face="Verdana"><font color="black" size="2"> </font></font></span></p>
<p><span
style="font-size: 11pt; color: rgb(31, 73, 125);"><font color="navy"
face="Verdana"><font color="black" size="2">I was able to
get the packet capture into Wireshark, and the RTP
packets are showing the following:</font></font></span></p>
<p><span
style="font-size: 11pt; color: rgb(31, 73, 125);"><font color="navy"
face="Verdana"><font color="black" size="2"> </font></font></span></p>
</div>
<p><span
style="font-size: 11pt; color: rgb(31, 73, 125);"><font color="navy"
face="Verdana"><font color="black" size="2">Differentiated
Services Field: 0xb8 (DSCP 0x2e: Expedited
Forwarding; ECN: 0x00)</font></font></span></p>
<p><span
style="font-size: 11pt; color: rgb(31, 73, 125);"><font color="navy"
face="Verdana"><font color="black" size="2">
1011
10.. = Differentiated Services Codepoint: Expedited Forward (0x2e)</font></font></span></p>
<p><span
style="font-size: 11pt; color: rgb(31, 73, 125);"><font color="navy"
face="Verdana"><font color="black" size="2"> </font></font></span></p>
<p><span
style="font-size: 11pt; color: rgb(31, 73, 125);"><font color="navy"
face="Verdana"><font color="black" size="2">Based on my
very limited knowledge, that does look like we're
applying QoS somewhere? If that is the case, would it be applied at the
switchports?</font></font></span></p>
<p><span
style="font-size: 11pt; color: rgb(31, 73, 125);"><font color="navy"
face="Verdana"><font color="black" size="2"> </font></font></span></p>
<font color="navy" face="Verdana"><font color="black"
size="2"><br>
</font></font></div>
</td>
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<td width="4%"><br>
</td>
<td valign="top" width="45%"><font face="Verdana"
size="2"><font color="navy"><strong>John V. Weigand</strong><br>
</font><font color="black" size="1"><font color="navy">Help
Desk Support/Executive Support<br>
</font><br>
Litigation Management, Inc.<br>
300 Allen-Bradley Drive<br>
Suite 200<br>
Mayfield Heights, OH 44124<br>
<br>
</font></font></td>
<td valign="top" width="51%">
<p><font face="Verdana" size="2"><font color="navy"><font
size="1"><font color="black"><br>
<br>
<font size="3"><br>
</font>Tel:</font> 440-484-2000</font><br>
</font><font size="1"><font color="black">Fax:
440-484-2009<br>
Cell: <br>
email: <a moz-do-not-send="true"
href="mailto:jvw@medicineforthedefense.com" target="_blank">jvw@medicineforthedefense.com</a>
<br>
</font></font></font></p>
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<p><font color="black"><font face="Verdana" size="2"><b><span
style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;">
Sean
Walberg
[<a moz-do-not-send="true" href="mailto:swalberg@gmail.com"
target="_blank">mailto:swalberg@gmail.com</a>] <br>
<b>Sent:</b> Monday, January 05, 2009 5:37 PM<br>
<b>To:</b> James Buchanan<br>
<b>Cc:</b> Weigand, John V.; <a moz-do-not-send="true"
href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br>
<b>Subject:</b> Re: [cisco-voip] How to check for QoS?</span></font></font></p>
<p><font color="black"><font face="Verdana" size="2"> </font></font></p>
<p style="margin-bottom: 12pt;"><font color="black"><font
face="Verdana" size="2">If you get the packet capture
into Wireshark, you can (in addition to checking for the DSCP == EF)
measure
the latency to see if QoS is doing its job.<br>
<br>
>From a router, though, you can check your policy maps with "show
policy-map" or "show policy-map interface", it will tell you if
a policy is applied and what it's doing. You're looking for a priority
queue.<br>
<br>
The Cisco QoS SRND is a good way to understand QoS. It's hefty, but
most
of the details are duplicated for every model of switch.<br>
<br>
Sean</font></font></p>
<div>
<p><font color="black"><font face="Verdana" size="2">On
Mon, Jan 5, 2009 at 4:07 PM, James Buchanan <<a
moz-do-not-send="true" href="mailto:jbuchanan@ctiusa.com"
target="_blank">jbuchanan@ctiusa.com</a>>
wrote:</font></font></p>
<div>
<div>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2">Hi John,</font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2"> </font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2">The biggest thing you are looking for is that
the voice traffic is being marked and that the marking is being
recognized
throughout the network. A packet capture is the quickest way to
determine
this. In the packet capture, you will see a field for Differentiated
Services.
For traffic that is the actual audio payload, you should see the
Differentiated
Services field as Expedited Forwarding. You will want to check packets
going in
each direction. </font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2"> </font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2">On the switches, for ports that have a phone
plugged in you should see that the switchport is configured to trust
cos and is
configured to trust based on the device being a cisco phone (mls qos
trust cos
and mls qos trust cisco-phone). What these commands look like can vary
according to the model of switch. </font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2"> </font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2">For any connection that is a voice server or
voice gateway, the switchport should trust the dscp value (mls qos
trust dscp).
This should also be true on uplinks from switch to switch and from
switch to
WAN router.</font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2"> </font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2">On the WAN router, depending upon the speed of
your connection you should be using some sort of low latency queuing
and/or
traffic shaping.</font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2"> </font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2">Thanks,</font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2"> </font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2">James</font></font></span></p>
<p><span style="color: rgb(31, 73, 125);"><font color="black"><font
face="Verdana" size="2"> </font></font></span></p>
<div>
<div
style="border-style: solid none none; border-color: -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p><font color="black"><font face="Verdana" size="2"><b><span
style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;">
<a moz-do-not-send="true"
href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>
[mailto:<a moz-do-not-send="true"
href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>]
<b>On Behalf Of </b>Weigand, John V.<br>
<b>Sent:</b> Monday, January 05, 2009 4:02 PM<br>
<b>To:</b> <a moz-do-not-send="true"
href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br>
<b>Subject:</b> [cisco-voip] How to check for QoS?</span></font></font></p>
</div>
</div>
<div>
<div>
<p><font color="black"><font face="Verdana" size="2"> </font></font></p>
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href="http://www.medicineforthedefense.com/" target="_blank"><span
style="font-size: 10pt; color: olive;">Serious Medicine for the
Defense ®</span></a></span><span style="font-size: 10pt; color: olive;">
</span></p>
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valign="top" width="100%">
<p><span style="color: black;">I've been tasked with
checking to see if our VAR ever setup any QoS at all, and if so, what
type and how it's set. Unfortunately, although I've become fairly
proficient at CallManager itself, I'm pretty new to the inner workings
of everything at the actual network level.</span></p>
<p><span style="color: black;"> </span></p>
<p><span style="color: black;">I know there's a few
different ways to set it all up, and I've tried poking around, but I'm
not really even sure where to begin looking. Does anyone have any
pointers as to how I might be able to track down some of this info? Is
there anything I can tell from a packet capture of a call from between
two of our sites? I do also have read only access to the
switches/routers on the network. </span></p>
<p><span style="color: black;"> </span></p>
<p><span style="color: black;">Thanks in advance!</span></p>
<p><span style="color: navy;"> </span></p>
</td>
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</td>
<td style="padding: 0.75pt; width: 45%;" valign="top"
width="45%">
<p style="margin-bottom: 12pt;"><b><span
style="font-size: 10pt; color: navy;">John V. Weigand</span></b><span
style="font-size: 10pt; color: navy;"><br>
</span><span style="font-size: 7.5pt; color: navy;">Help
Desk Support/Executive Support<br>
</span><span style="font-size: 7.5pt; color: black;"><br>
Litigation Management, Inc.<br>
300 Allen-Bradley Drive<br>
Suite 200<br>
Mayfield Heights, OH 44124</span></p>
</td>
<td style="padding: 0.75pt; width: 51%;" valign="top"
width="51%">
<p><span style="font-size: 7.5pt; color: black;"><br>
<br>
</span><span style="color: black;"><br>
</span><span style="font-size: 7.5pt; color: black;">Tel:</span><span
style="font-size: 7.5pt; color: navy;"> 440-484-2000</span><span
style="font-size: 10pt; color: navy;"><br>
</span><span style="font-size: 7.5pt; color: black;">Fax:
440-484-2009<br>
Cell: <br>
email: <a moz-do-not-send="true"
href="mailto:jvw@medicineforthedefense.com" target="_blank">jvw@medicineforthedefense.com</a>
</span></p>
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<br clear="all">
<br>
-- <br>
Sean Walberg <<a moz-do-not-send="true" href="mailto:sean@ertw.com"
target="_blank">sean@ertw.com</a>>
<a moz-do-not-send="true" href="http://ertw.com/" target="_blank">http://ertw.com/</a></font></font></p>
<pre><hr size="4" width="90%">_______________________________________________
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<br>
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