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Can NPM monitoring traffic be set to a specific DSCP value within the app?

nathanvetter

We are wondering if we can define the DSCP value from NPM and trust dscp from the switchport to give it certain priority in the network. This is more critical when the primary circuit between data centers goes down and we are running on an under sized backup circuit. We were hoping not to need to create a policy-map for the traffic. I am unable to find any such options.

THANKS

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Accepted answers

ecklerwr1

Also here's some GP info:

QoS Group Policy Settings and Registry Entries

The following Group Policy settings and registry entries are associated with QoS. Each registry setting has a corresponding Group Policy setting. The registry settings appear at four locations in the registry; most of the settings are repeated in three of those locations. The registry structure matches the structure of the Computer Configuration Group Policy settings under Administrative Templates in the Group Policy tool. Each of the tables in this section describes the Group Policy settings and the registry entries in one of those four locations.

The information here is provided as a reference for use in troubleshooting or verifying that the required settings are applied. It is recommended that you do not directly edit the registry unless there is no other alternative. Modifications to the registry are not validated by the registry editor or by Windows before they are applied, and as a result, incorrect values can be stored. This can result in unrecoverable errors in the system. When possible, use Group Policy or other Windows tools, such as Microsoft Management Console (MMC), to accomplish tasks rather than editing the registry directly. If you must edit the registry, use extreme caution.

The registry entries are associated with Windows 2000, Windows XP, and Windows Server 2003. For more information about these registry entries, see the Group Policy Settings Reference for Windows Server 2003.

The following table describes three of the Group Policy settings that are associated with the QoS Packet Scheduler that do not set alternative Differentiated Services Code Point (DSCP) values. These Group Policy settings are located in Computer Configuration Group Policy at Administrative Templates\Network\QoS Packet Scheduler; they control registry entries located under HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Psched.

Group Policy Settings Associated with QoS Packet Scheduler

Group Policy Setting	Description	Registry Entry
Limit outstanding packets	Specifies the maximum number of outstanding packets permitted on the system. When the number of outstanding packets reaches this limit, the QoS Packet Scheduler postpones all submissions to network adapters until the number falls below this limit.	MaxOutstandingSends
Limit reservable bandwidth	Specifies the maximum, total percentage of link bandwidth that all QoS-aware applications on this computer can reserve. If no QoS-aware application reserves any bandwidth, then this setting has no effect and all bandwidth is available for use by other applications. If a QoS-aware application reserves more bandwidth than it uses, then the unused, reserved bandwidth is available for use by other applications. The reservation does not ensure that the bandwidth will be available to the QoS-aware application because applications that are not QoS-aware might consume too much bandwidth. For example, the default value of the registry entry reserves 80 percent of the bandwidth for QoS-aware applications, but this does not prevent other applications from using more than the remaining 20 percent of the bandwidth.	NonBestEffortLimit
Set timer resolution	Determines the smallest unit of time, in microseconds, used by the QoS Packet Scheduler when scheduling packets for transmission. The QoS Packet Scheduler cannot schedule packets for transmission more frequently than permitted by the value of this entry.	TimerResolution

The following table describes Group Policy settings that are associated with QoS and that set alternative DSCP values for packets that conform to the QoS traffic flow specification. You can use these Group Policy settings to specify alternative Layer-3 DSCP values, which are used by Layer 3 network devices to identify each of five service types. These Group Policy settings are located in Computer Configuration Group Policy at Administrative Templates\Network\QoS Packet Scheduler\DSCP value of conforming packets; they control registry entries located under HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Psched\DiffservByteMappingConforming.

Group Policy Settings Associated with DSCP Values of Conforming Packets

Group Policy Setting	Description	Registry Entry
Best effort service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the best effort service type.	ServiceTypeBest Effort
Controlled load service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the controlled load service type.	ServiceTypeControlledLoad
Guaranteed service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the guaranteed service type.	ServiceTypeGuaranteed
Network control service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the network control service type.	ServiceTypeNetworkControl
Qualitative service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the qualitative service type.	ServiceTypeQualitative

The following table describes Group Policy settings that are associated with QoS and that set alternative DSCP values for packets that do not conform to the QoS traffic flow specification. You can use these Group Policy settings to specify alternative Layer-3 DSCP values, which are used by Layer 3 network devices to identify each of five service types. These Group Policy settings are located in Computer Configuration Group Policy at Administrative Templates\Network\QoS Packet Scheduler\DSCP value of non-conforming packets; they control registry entries located under HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Psched\DiffservByteMappingNonConforming.

Group Policy Settings Associated with DSCP Values of Non-conforming Packets

Group Policy Setting	Description	Registry Entry
Best effort service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the best effort service type.	ServiceTypeBestEffort
Controlled load service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the controlled load service type.	ServiceTypeControlledLoad
Guaranteed service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the guaranteed service type.	ServiceTypeGuaranteed
Network control service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the network control service type.	ServiceTypeNetworkControl
Qualitative service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the qualitative service type.	ServiceTypeQualitative

The following table describes Group Policy settings that are associated with QoS and that set alternative Layer-2 priority values. You can use these Group Policy settings to specify alternative Layer-2 priority values, which Layer 2 network devices use to identify each of five service types. These Group Policy settings are located in Group Policy at Administrative Templates\Network\QoS Packet Scheduler\Layer-2 priority value; they control registry entries located under HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Psched\UserPriorityMapping.

Group Policy Settings Associated with Layer-2 Priority Values

Group Policy Setting	Description	Registry Entry
Non-conforming packets	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets that do not conform to the flow specification.	ServiceTypeNonConforming
Best effort service type	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets to request the best effort service type.	ServiceTypeBestEffort
Controlled load service type	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets to request the controlled load service type.	ServiceTypeControlledLoad
Guaranteed service type	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets to request the guaranteed service type.	ServiceTypeGuaranteed
Network control service type	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets to request the network control service type.	ServiceTypeNetworkControl
Qualitative service type	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets to request the qualitative service type.	ServiceTypeQualitative

All comments

mcbridea

If I read you right you want to set QoS policies. I believe this is only possible via CLI.

nathanvetter

Well it is for QOS but we are wondering if we can set a DSCP value via the application to use that we can trust on the network port to the server to be classified into a network monitoring class instead of the default class on a WAN policy-map. Some video conferncing gear lets us set a DSCP value and then we just trust it and we don't have to worry about tagging it ourselves. If we can't tag the traffic from the server / app then we will have to create a policy-map and link it to the server switch port instead of simply trusting dscp.

ecklerwr1

This doesn't need to be done via the application. Since NPM in on windows server there's a couple step involved depending on what kind of QOS you want to use. Here's a good article on how to enable and use it... probably easier than me trying to explain it :}

technet.microsoft.com/.../2007.02.cableguy.aspx

ecklerwr1

Also here's some GP info:

QoS Group Policy Settings and Registry Entries

Group Policy Settings Associated with QoS Packet Scheduler

Group Policy Setting	Description	Registry Entry
Limit outstanding packets	Specifies the maximum number of outstanding packets permitted on the system. When the number of outstanding packets reaches this limit, the QoS Packet Scheduler postpones all submissions to network adapters until the number falls below this limit.	MaxOutstandingSends
Limit reservable bandwidth	Specifies the maximum, total percentage of link bandwidth that all QoS-aware applications on this computer can reserve. If no QoS-aware application reserves any bandwidth, then this setting has no effect and all bandwidth is available for use by other applications. If a QoS-aware application reserves more bandwidth than it uses, then the unused, reserved bandwidth is available for use by other applications. The reservation does not ensure that the bandwidth will be available to the QoS-aware application because applications that are not QoS-aware might consume too much bandwidth. For example, the default value of the registry entry reserves 80 percent of the bandwidth for QoS-aware applications, but this does not prevent other applications from using more than the remaining 20 percent of the bandwidth.	NonBestEffortLimit
Set timer resolution	Determines the smallest unit of time, in microseconds, used by the QoS Packet Scheduler when scheduling packets for transmission. The QoS Packet Scheduler cannot schedule packets for transmission more frequently than permitted by the value of this entry.	TimerResolution

Group Policy Settings Associated with DSCP Values of Conforming Packets

Group Policy Setting	Description	Registry Entry
Best effort service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the best effort service type.	ServiceTypeBest Effort
Controlled load service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the controlled load service type.	ServiceTypeControlledLoad
Guaranteed service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the guaranteed service type.	ServiceTypeGuaranteed
Network control service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the network control service type.	ServiceTypeNetworkControl
Qualitative service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the qualitative service type.	ServiceTypeQualitative

Group Policy Settings Associated with DSCP Values of Non-conforming Packets

Group Policy Setting	Description	Registry Entry
Best effort service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the best effort service type.	ServiceTypeBestEffort
Controlled load service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the controlled load service type.	ServiceTypeControlledLoad
Guaranteed service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the guaranteed service type.	ServiceTypeGuaranteed
Network control service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the network control service type.	ServiceTypeNetworkControl
Qualitative service type	Defines the DSCP value that the QoS Packet Scheduler inserts into packets to request the qualitative service type.	ServiceTypeQualitative

Group Policy Settings Associated with Layer-2 Priority Values

Group Policy Setting	Description	Registry Entry
Non-conforming packets	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets that do not conform to the flow specification.	ServiceTypeNonConforming
Best effort service type	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets to request the best effort service type.	ServiceTypeBestEffort
Controlled load service type	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets to request the controlled load service type.	ServiceTypeControlledLoad
Guaranteed service type	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets to request the guaranteed service type.	ServiceTypeGuaranteed
Network control service type	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets to request the network control service type.	ServiceTypeNetworkControl
Qualitative service type	Defines the priority value that the QoS Packet Scheduler inserts into the Layer-2 header of packets to request the qualitative service type.	ServiceTypeQualitative