<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">fully agreed with everything stated here. in addition ttcp can be a useful tool for generating traffic to verify QoS functionality and performance. When all implemented properly you should be able to slam links with traffic and maintain signaling (no or nominal delay offhook to dialtone) and media (good voice quality with no or nominal packet jitter and loss)<div><br></div><div>regards,</div><div>wes</div><div><br><div><div>On Jan 5, 2009, at 5:36 PM, Sean Walberg wrote:</div><br class="Apple-interchange-newline">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<br><br><div class="gmail_quote">On Mon, Jan 5, 2009 at 4:07 PM, James Buchanan <span dir="ltr"><<a href="mailto:jbuchanan@ctiusa.com" target="_blank">jbuchanan@ctiusa.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 link="blue" vlink="purple" lang="EN-US"> <div><p><span style="color: rgb(31, 73, 125);">Hi John,</span></p><div><span style="color: rgb(31, 73, 125);"> </span><br class="webkit-block-placeholder"></div><p><span style="color: rgb(31, 73, 125);">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. </span></p><div><span style="color: rgb(31, 73, 125);"> </span><br class="webkit-block-placeholder"></div><p><span style="color: rgb(31, 73, 125);">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. </span></p><div><span style="color: rgb(31, 73, 125);"> </span><br class="webkit-block-placeholder"></div><p><span style="color: rgb(31, 73, 125);">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.</span></p><div><span style="color: rgb(31, 73, 125);"> </span><br class="webkit-block-placeholder"></div><p><span style="color: rgb(31, 73, 125);">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.</span></p><div><span style="color: rgb(31, 73, 125);"> </span><br class="webkit-block-placeholder"></div><p><span style="color: rgb(31, 73, 125);">Thanks,</span></p><div><span style="color: rgb(31, 73, 125);"> </span><br class="webkit-block-placeholder"></div><p><span style="color: rgb(31, 73, 125);">James</span></p><div><span style="color: rgb(31, 73, 125);"> </span><br class="webkit-block-placeholder"></div> <div> <div style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;"><p><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> <a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a> [mailto:<a 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 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></p> </div> </div><div><div></div><div><div> <br class="webkit-block-placeholder"></div> <table style="border: medium none ; width: 494.25pt; border-collapse: collapse;" width="659" border="1" cellpadding="0" cellspacing="0"> <tbody><tr style="height: 67.5pt;"> <td style="border-style: solid none none solid; border-width: 1pt medium medium 1pt; padding: 0in; width: 4%; height: 67.5pt;" width="4%"> </td> <td style="border-style: solid none none; border-color: rgb(102, 102, 102) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 0in; width: 59%; height: 67.5pt;" width="59%"><p><img alt="Litigation Management" width="279" align="left" height="54"><span style="font-size: 12pt; font-family: "Times New Roman","serif";"></span></p> </td> <td style="border-style: solid none none; border-color: rgb(102, 102, 102) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 0in; width: 36%; height: 67.5pt;" width="36%"><p style="text-align: right;" align="right"><span style="color: navy;"><a 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> </td> <td style="border-style: solid solid none none; border-color: rgb(102, 102, 102) silver -moz-use-text-color -moz-use-text-color; border-width: 1pt 2.25pt medium medium; padding: 0in; width: 1%; height: 67.5pt;" width="1%"> </td> </tr> <tr style="height: 104.25pt;"> <td colspan="3" style="border-style: none none solid solid; border-color: -moz-use-text-color -moz-use-text-color silver rgb(102, 102, 102); border-width: medium medium 2.25pt 1pt; padding: 0in; width: 100%; height: 104.25pt;" width="100%"> <table style="width: 99%;" width="99%" border="0" cellpadding="0"> <tbody><tr> <td style="padding: 0.75pt; width: 4%;" width="4%"></td> <td colspan="2" style="padding: 0.75pt; width: 100%;" 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><div><span style="color: black;"> </span><br class="webkit-block-placeholder"></div><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><div><span style="color: black;"> </span><br class="webkit-block-placeholder"></div><p><span style="color: black;">Thanks in advance!</span></p><div><span style="font-size: 12pt; color: navy;"> </span><br class="webkit-block-placeholder"></div> </td> </tr> <tr> <td style="padding: 0.75pt; width: 4%;" width="4%"></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><span style="font-size: 12pt; font-family: "Times New Roman","serif";"></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 href="mailto:jvw@medicineforthedefense.com" target="_blank">jvw@medicineforthedefense.com</a> </span></p> </td> </tr> </tbody></table> </td> <td style="border-style: none solid solid none; border-color: -moz-use-text-color silver silver -moz-use-text-color; border-width: medium 2.25pt 2.25pt medium; padding: 0in; height: 104.25pt;"></td> </tr> </tbody></table><p style="margin-bottom: 12pt;"><span style="font-size: 7.5pt; color: gray;"><br> PRIVILEGE AND CONFIDENTIALITY NOTICE <br> <br> The information in this electronic mail is intended for the named recipients only. It may contain privileged and confidential material and may be protected under law by the Health Insurance Portability and Accountability Act. Any use of this information by anyone other than the intended receiver is prohibited. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution, copying, or other use of this message or its attachments is strictly prohibited. If you have received this message in error, please notify the sender immediately by replying to this electronic e-mail or by calling (800) 778-5424. Please delete it from your computer. Thank you.</span><span style="font-size: 12pt; font-family: "Times New Roman","serif";"></span></p> </div></div><p><span style="font-size: 10pt;">No virus found in this incoming message.<br> Checked by AVG - <a href="http://www.avg.com" target="_blank">http://www.avg.com</a><br> Version: 8.0.176 / Virus Database: 270.10.1/1869 - Release Date: 1/5/2009 9:44 AM</span></p> </div> </div> <br>_______________________________________________<br> cisco-voip mailing list<br> <a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br> <a href="https://puck.nether.net/mailman/listinfo/cisco-voip" target="_blank">https://puck.nether.net/mailman/listinfo/cisco-voip</a><br> <br></blockquote></div><br><br clear="all"><br>-- <br>Sean Walberg <<a href="mailto:sean@ertw.com" target="_blank">sean@ertw.com</a>> <a href="http://ertw.com/" target="_blank">http://ertw.com/</a><br> _______________________________________________<br>cisco-voip mailing list<br><a href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a><br>https://puck.nether.net/mailman/listinfo/cisco-voip<br></div><br></div></body></html>