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Windows Vista and Windows 7 include a new implementation of the QoS
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component in the pacer.sys NDIS 6.0 lightweight filter driver, located in %SystemRoot% \System32\Drivers. pacer.sys replaces psched.sys, which is used in the Windows Server 2003 and Windows Xp operating systems. It continues to support the Generic QoS (GQoS) and Traffic Control (TC) application programming interfaces (apIs) provided by Microsoft Windows 2000, Windows Xp, and Windows Server 2003. Therefore, existing applications that use QoS will work with Windows Vista and Windows 7. For more information about these apIs, see The MS QoS Components at http://technet.microsoft.com/en-us/library /bb742475.aspx.
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CHapTER 25 Configuring Windows Networking
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When sending packets, computers add a DSCP value that your network infrastructure can examine to determine how the packet should be prioritized . Although DSCP values can be arbitrary depending on how your network infrastructure is configured, many organizations use a typical DSCP strategy with the following five queues:
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Control traffic Communications transmitted between routers . Typically, these communications require minimal bandwidth, but they should be assigned a high priority because quick transmission can reduce downtime in the event of a hardware failure . You should also use this priority for VoIP control traffic . Use DSCP values of 25 for control traffic . latency-sensitive traffic Traffic, such as VoIP, that must be delivered as quickly as possible . Typically, you should assign this a DSCP value of 46, known as Expedited Forwarding (EF) . Business critical traffic, also known as Better than Best Effort (BBE) Communications that should receive priority treatment, such as customer service database queries from a line-of-business (LOB) application or streaming video, but that are not highly sensitive to latency . Use a DSCP value of 34 . Best-effort (BE) traffic Standard traffic, including any traffic not marked with a DSCP number, that should be handled after either of the preceding two queues . This traffic should have a DSCP value of 0, which is the default if no DSCP value is specified . Scavenger traffic Low-priority traffic, such as backups, downloading of updates, noncritical file synchronization, and non work-related traffic that employees might generate . Use a DSCP value of 10 or 8 .
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If you mark traffic from too many applications as high priority, the high-priority
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queue on routers can grow long enough to add significant latency. This defeats the purpose of QoS. Therefore, you should reserve the highest-priority DSCp marking for real-time communications, such as VoIp.
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Table 25-1 summarizes these values .
TABlE 25-1 DSCP Interoperability Values
PURPOSE
COMMON USES
DSCP VAlUE
VoIP Interactive video Mission-critical data Best effort Bulk data
VoIP traffic, including signaling and control traffic Two-way video conferencing Database queries, LOB communications, video streaming All other traffic, including e-mail and Web browsing Backups, nonbusiness applications, file transfers
46 34 25 0 10
Manageability Improvements CHapTER 25
Many networks use an even simpler structure with only two priorities: one for latencysensitive traffic and another for BE traffic . However, if you have third-party tools that can use DSCP values to report on network performance for different types of traffic, it is advantageous to define a larger number of DSCP values even if your network infrastructure isn t configured to handle each DSCP value uniquely . DSCP values might be lost when packets leave your network because most organizations do not trust priorities provided by computers outside the organization . Because sending traffic labeled as high priority can create a denial-of-service (DoS) attack, DSCP values from untrusted computers might be malicious . Wireless Multimedia (WMM) includes four access categories for prioritizing traffic on 802 .11 wireless networks . WMM uses DSCP values to set the priority, so you can take advantage of WMM automatically by specifying DSCP values . Table 25-2 shows how DSCP values correspond to WMM access categories .
TABlE 25-2 DSCP Values and WMM Access Categories
DSCP VAlUE
WMM ACCESS CATEgORy
48 63 32 47 24 31, 0 7 8 23
Voice (VO) Video (VI) Best effort (BE) Background (BK)
To support fully prioritizing traffic based on DSCP values, your network infrastructure must support the use of multiple queues as defined in RFC 2474 .
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