To provide true differentiated services, you must include a Diffserv-aware router in your network topology, as described in Hardware Strategies for the Diffserv Network. The actual steps for configuring Diffserv on a router and updating that router's files are outside the scope of this guide.
This section provides general steps for coordinating the forwarding information among various IPQoS-enabled systems on the network and the Diffserv router.
First, review the configuration files for all IPQoS-enabled systems on your network for the codepoints that are used in the various QoS policies.
List the codepoints and the systems and classes to which the codepoints apply. Although using the same codepoint for different areas is acceptable, you should provide other criteria in the IPQoS configuration file, such as a precedence selector, to determine the precedence of identically marked classes.
For example, for the sample network that is used in the procedures throughout this chapter, you might construct the following codepoint table.
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After you have identified the codepoints from your network's IPQoS configuration files, add them to the appropriate files on the Diffserv router. The codepoints that you supply should help to configure the router's Diffserv scheduling mechanism. Refer to the router manufacturer's documentation and web sites for instructions.