Article ID: 329704 - View products that this article applies to.
This article was previously published under Q329704
Differentiated Services Code Point (DSCP) enables packets that pass through network devices that operate on Layer 3 information (such as routers) to have their relative priorities differentiated from one another.
You establish DSCP by setting the first six bits of the Type of Service (TOS) field in the IP header. DSCP determines IP precedence, but maintains backward compatibility. With DSCP marking, Layer 3 devices can establish aggregated precedence-based queues and provide better service to packets that have a higher relative priority. This is helpful when packet services are subject to queuing, such as when there are significant network traffic loads associated with streaming media presentations and other real-time data streams. For DSCP to be effective, Layer 3 devices must be DSCP-enabled.
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986Warning This article contains information about editing the namespace. Before you edit the namespace, verify that you have a backup copy that you can restore if a problem occurs. If you edit the namespace incorrectly, you can cause serious problems that may require you to reinstall any product that uses the namespace. Microsoft cannot guarantee that problems that result if you incorrectly edit the namespace can be solved. Edit the namespace at your own risk.
(http://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
You can set the Type of Service (TOS) bits in the IP header by editing the registry, and by editing the properties section of the WMS Unicast Data Writer plug-in in the ServerNamespace.xml file. To edit the ServerNamespace.xml file that the server uses, follow these steps:
You can change the value from 0x00 to the appropriate setting for the IP TOS field. TOS is an 8-bit field. The 6 bits that are least significant are used for the TOS setting, and the 2 bits that are most significant are used for early congestion notification (ECN enabled and ECN reported).
Note the following:
Article ID: 329704 - Last Review: October 11, 2004 - Revision: 4.1
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