QOS Setup Guide - Revision history

Drew Harrell at 22:24, 25 April 2013

2013-04-25T22:24:18Z

Paul Falanga at 18:51, 9 November 2012

2012-11-09T18:51:32Z

Paul Falanga at 15:11, 26 October 2012

2012-10-26T15:11:41Z

Paul Falanga at 19:07, 3 October 2012

2012-10-03T19:07:30Z

Paul Falanga at 18:48, 3 October 2012

2012-10-03T18:48:39Z

Drew Harrell at 19:04, 7 September 2012

2012-09-07T19:04:54Z

Drew Harrell at 19:03, 7 September 2012

2012-09-07T19:03:30Z

Paul Falanga at 16:13, 8 August 2012

2012-08-08T16:13:00Z

Paul Falanga at 15:18, 8 August 2012

2012-08-08T15:18:37Z

Paul Falanga at 15:14, 8 August 2012

2012-08-08T15:14:06Z

← Older revision		Revision as of 22:24, 25 April 2013
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	That's it! QOS is now set on this switch to prioritize voice traffic over non-voice traffic.		That's it! QOS is now set on this switch to prioritize voice traffic over non-voice traffic.
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		+	[[Category: Troubleshooting\|QoS Setup]]

← Older revision		Revision as of 18:51, 9 November 2012
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	The Netgear FS728TP product specs are available at: [http://www.netgear.com/business/products/switches/smart-switches/FS728TP.aspx http://www.netgear.com/business/products/switches/smart-switches/FS728TP.aspx]		The Netgear FS728TP product specs are available at: [http://www.netgear.com/business/products/switches/smart-switches/FS728TP.aspx http://www.netgear.com/business/products/switches/smart-switches/FS728TP.aspx]
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		+	This is a concise description of how QOS is implemented(by Netgear): [http://www.ipitomy.com/images/email_resource/QoS_on_Netgear_Switches.pdf http://][http://www.ipitomy.com/images/email_resource/QoS_on_Netgear_Switches.pdf www.ipitomy.com/images/email_resource/QoS_on_Netgear_Switches.pdf]
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	We like the switch because it is cost-effective and efficiently performs the tasks required to optimize a network for voice traffic.		We like the switch because it is cost-effective and efficiently performs the tasks required to optimize a network for voice traffic.

← Older revision		Revision as of 15:11, 26 October 2012
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	First let me state that if already understand QoS and are just looking for where you set the DSCP value, Navigate to PBXSetup->SIP and under advanced go to SIP TOS and RTP TOS.  Set these to any of the available class selector values, then set the selected class to be high priority in your switch.		First let me state that if already understand QoS and are just looking for where you set the DSCP value, Navigate to PBXSetup->SIP and under advanced go to SIP TOS and RTP TOS.  Set these to any of the available class selector values, then set the selected class to be high priority in your switch.
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		+	[http://www.ipitomy.com/images/email_resource/qos_flash.swf Click here for brief illustration of how QOS works] (press the browser BACK button to return here)
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	If you have an unmanaged switch that supports QoS, you will need to consult the documentation but you can probably set CS5-7 and the switch should prioritize you over most traffic.		If you have an unmanaged switch that supports QoS, you will need to consult the documentation but you can probably set CS5-7 and the switch should prioritize you over most traffic.

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 The type of service (TOS) field in the IPv4 header has had various purposes over the years, and has been defined in different ways by five RFCs[1]. The modern redefinition of the TOS field is a six-bit Differentiated Services Field (DS field)[2] field and a two-bit Explicit Congestion Notification (ECN) field.[3] While Differentiated Services is somewhat backwards compatible with TOS, ECN is not. (Source: Wikipedia [http://en.wikipedia.org/wiki/Type_of_Service http://en.wikipedia.org/wiki/Type_of_Service])
-More DiffServ information:&nbsp;[http://en.wikipedia.org/wiki/Differentiated_Services_Code_Point http://en.wikipedia.org/wiki/Differentiated_Services_Code_Point]
+Other VERY helpful information:
 ;Step 1.

@@ Line 1: / Line 1: @@
 QOS will enhance the function of Voice on the network in most cases. There are cases where the use of managed switches will likely not impact the performance of voice over the network but these are exceptions and IPitomy recommends using a Managed Switch on all commercially deployed implementations of voice products.
 First let me state that if already understand QoS and are just looking for where you set the DSCP value, Navigate to PBXSetup->SIP and under advanced go to SIP TOS and RTP TOS.&nbsp; Set these to any of the available class selector values, then set the selected class to be high priority in your switch.&nbsp;
 If you have an unmanaged switch that supports QoS, you will need to consult the documentation but you can probably set CS5-7 and the switch should prioritize you over most traffic.
@@ Line 121: / Line 121: @@
 The type of service (TOS) field in the IPv4 header has had various purposes over the years, and has been defined in different ways by five RFCs[1]. The modern redefinition of the TOS field is a six-bit Differentiated Services Field (DS field)[2] field and a two-bit Explicit Congestion Notification (ECN) field.[3] While Differentiated Services is somewhat backwards compatible with TOS, ECN is not. (Source: Wikipedia [http://en.wikipedia.org/wiki/Type_of_Service http://en.wikipedia.org/wiki/Type_of_Service])
 ;Step 1.

@@ Line 1: / Line 1: @@
 QOS will enhance the function of Voice on the network in most cases. There are cases where the use of managed switches will likely not impact the performance of voice over the network but these are exceptions and IPitomy recommends using a Managed Switch on all commercially deployed implementations of voice products.
-First let me state that if you know what you are doing, Navigate to PBXSetup->SIP and under advanced go to SIP TOS and RTP TOS.&nbsp; Set these to any of the available class selector values, then set the selected class to be high priority in your switch.&nbsp; If you have an unmanaged switch that supports QoS, you will need to consult the documentation but you can probably set CS5-7 and the switch should prioritize you over most traffic.
+First let me state that if already understand QoS and are just looking for where you set the DSCP value, Navigate to PBXSetup->SIP and under advanced go to SIP TOS and RTP TOS.&nbsp; Set these to any of the available class selector values, then set the selected class to be high priority in your switch.&nbsp;
 IPitomy performs QoS by tagging packets with DSCP values.&nbsp; DSCP refers to a field that is reserved for tags in every packet sent.&nbsp; This field has a value from 0-63.&nbsp; And manufacturers use many different names for the values in this field.&nbsp; One of the most prominent names for values are the "Class Selector" values.&nbsp; Their names start with "CS".&nbsp; But their decimal and binary values are below:
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 The important thing with configuring QoS is understanding how a switch "sees" your packets and how a priority is used in your particular equipment.&nbsp;
 For the first part:&nbsp; Does the switch trust the values you set on packets or does it just wipe them out and put another value?&nbsp; This is often defened as a DSCP "Trust" Mode.&nbsp; Does the switch trust what it sees or does it set the value everything on port x to a hard-coded value?

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-QOS will enhance the function of Voice on the network in most cases.
+QOS will enhance the function of Voice on the network in most cases. There are cases where the use of managed switches will likely not impact the performance of voice over the network but these are exceptions and IPitomy recommends using a Managed Switch on all commercially deployed implementations of voice products.
 There are cases where the use of managed switches will likely not impact the performance of voice over the network but these are exceptions and IPitomy recommends using a Managed Switch on all commercially deployed implementations of voice products.
 The implementation of QOS varies greatly from one switch manufacturer to another and therefore we have decided to post this guide for one of the switches for which we have experience, the Netgear FS728TP. '''(Note: many switch manufacturers set CS3 {IPitomy Default} to Low or Normal Priority. When the switch manufacturer states "QOS is ON at default" do not assume you can just plug it in and it'll do what you hope it will do.)'''
-The Netgear FS728TP product specs are available at: http://www.netgear.com/business/products/switches/smart-switches/FS728TP.aspx
+The Netgear FS728TP product specs are available at: [http://www.netgear.com/business/products/switches/smart-switches/FS728TP.aspx http://www.netgear.com/business/products/switches/smart-switches/FS728TP.aspx]
 We like the switch because it is cost-effective and efficiently performs the tasks required to optimize a network for voice traffic.
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 For reference only the QOS setting in the PBX is shown:
-<blockquote>[[file:PBX GUI - SIP Advanced.gif]]</blockquote>
+The type of service (TOS) field in the IPv4 header has had various purposes over the years, and has been defined in different ways by five RFCs[1]. The modern redefinition of the TOS field is a six-bit Differentiated Services Field (DS field)[2] field and a two-bit Explicit Congestion Notification (ECN) field.[3] While Differentiated Services is somewhat backwards compatible with TOS, ECN is not. (Source: Wikipedia [http://en.wikipedia.org/wiki/Type_of_Service http://en.wikipedia.org/wiki/Type_of_Service])
 ;Step 1.
-: Navigate to the switch (we recommend setting the switch or switches to Static IP Address assignments since these are infrastructure devices that must be maintained and often require remote access. (The setting of Static IP Addressing for the switch is not covered in this guide but is very easily done under the heading of System - Management - IP Configuration.)<br/>[[file:Netgear_Loging_Screen.gif]]
+:Navigate to the switch (we recommend setting the switch or switches to Static IP Address assignments since these are infrastructure devices that must be maintained and often require remote access. (The setting of Static IP Addressing for the switch is not covered in this guide but is very easily done under the heading of System - Management - IP Configuration.)<br/>[[File:Netgear Loging Screen.gif]]
 ;Step 2.
-: Input the password ("password' at default)
+:Input the password ("password' at default)
 ;Step 3.
-: Navigate to the QOS tab
+:Navigate to the QOS tab
 ;Step 4.
-: Navigate to Basic - CoS Global Configuration
+:Navigate to Basic - CoS Global Configuration
 ;Step 5.
-: Enable QoS
+:Enable QoS
 ;Step 6.
-: Set the trust mode to DSCP (Differentiated Services Code Point)<br/>[[file:Netgear_QOS_Screen.gif]]
+:Set the trust mode to DSCP (Differentiated Services Code Point)<br/>[[File:Netgear QOS Screen.gif]]
 ;Step 7.
-: Navigate to Advanced - DSCP to Queue Mapping<br/>[[file:Netgear_DSCP_to_Queue_Mapping.gif]]
+:Navigate to Advanced - DSCP to Queue Mapping<br/>[[File:Netgear DSCP to Queue Mapping.gif]]
 ;Step 8.
-: Under Class Selector (CS) PHB select the queue priority High from the list for CS3
+:Under Class Selector (CS) PHB select the queue priority High from the list for CS3
 ;Step 9.
-: Select Apply
+:Select Apply
 That's it! QOS is now set on this switch to prioritize voice traffic over non-voice traffic.