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For some time, Cisco has identified end-to-end QoS as a goal the company wants to deploy in the enterprise Even before the QoS technologies were ready for prime time, Cisco unveiled a QoS initiative called CiscoAssure Like many of Cisco's terms that sound more like a program name, CiscoAssure isn't a discrete product It's a total QoS solution that is implemented by using a family of products Using all these products in their intended roles achieves all the benefits of QoS: prioritized traffic, central policy management, use of directory services, and so on The CiscoAssure architecture can be described in three components: QoS-enabled network devices Routers, switches, and firewalls must be able to understand QoS policies and treat incoming traffic differently based on these policies This feature must be supplied by the Cisco IOS Most versions of IOS after 110 include a wide variety of QoS features that make the network devices running them QoS aware Naming and directory services The CiscoAssure umbrella includes the services that provide IP addresses to end users (DHCP), as well as name-to-IP mapping services (DNS) It can be quite useful for QoS policies to be aware of users' IP addresses so that the policies can better prioritize traffic Also, including communication to directory services (such as Active Directory) in the QoS decision will certainly enhance the ability to generate "intelligent" policy decisions For example,
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you could build policies based on user attributes, such as the assigned user group Cisco does provide some of these services now through Network Registrar, as covered in 11 Also, as discussed in 2, the Directory- Enabled Network (DEN) initiative will bring network devices and directory services closer together Centralized policy management Creating QoS policies based on dynamic events (such as changing IP addresses) and directory information (such as user attributes) clearly will require a centralized control station and database Also, sending policies out to many network devices will require some automation Cisco is beginning to roll out this portion of CiscoAssure under the name of QoS Policy Manager The individual QoS technologies available today in Cisco IOS offer a vast array of methods to ensure traffic prioritization and control congestion They can be used individually, but are most often combined in a customized solution that best fits a particular business and its QoS needs These technologies are based on their method of delivering QoS: Packet classification Congestion management Congestion avoidance Traffic shaping Flow signaling The following sections describe Cisco's technologies in these categories and offer examples of their implementation on a Cisco router
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In the broadest sense, packet classification involves tagging each packet with some descriptor that other downstream network devices can use to prioritize it This tag might appear in the header of the packet or even within the payload, but most commonly the IP Precedence bits are used in IP networks In the header of an IP packet is a Type of Service (ToS) field reserved for tagging packets Three of the bits can be used for IP Precedence Of the eight possible combinations using three bits (2= 8), six can be used to create six separate classes of service Normally, these bits are untouched and ignored by network devices If, however, these bits are set and the network device is instructed to look for them, the device can use them to make routing/queuing decisions
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The intention is to set the IP Precedence bits on incoming data and then have the network devices handle traffic based on their reading of these bits The first configuration issue, then, is how to set these bits for incoming traffic
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