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 document.
This section gives general steps for coordinating the forwarding information among various IPQoS-enabled systems on the network and the diffserv router. The next procedure assumes that you have already configured the IPQoS systems on your network by performing the previous tasks in this chapter.
The next procedure uses as its example the topology in Figure 2–4.
Review the configuration files for all IPQoS-enabled systems on your network.
Identify each codepoint that is used in the various policies.
List the codepoints, and the systems and classes, to which the codepoints apply. The table can illustrate areas where you might have used the same codepoint. This practice is acceptable, but you should provide other criteria in the IPQoS configuration file, such as a precedence selector, to be used to determine the precedence of identically marked classes.
For example, for the sample network that is used in the procedures of this chapter, you might construct the following codepoint table.
Table 3–2 Per-Hop Behaviors Configured for a Sample Network
System |
Class |
PHB |
DS Codepoint |
---|---|---|---|
Goldweb |
video |
EF |
46 (101110) |
“ “ |
goldweb |
AF11 |
10 (001010) |
Userweb |
webout |
AF12 |
12 ( 001100) |
BigAPPs |
smtp |
AF13 |
14 ( 001110) |
“ |
news |
AF18 |
18 ( 010010) |
“ |
ftp conformant traffic |
AF22 |
20 ( 010100) |
“ |
ftp nonconformant traffic |
AF31 |
26 ( 011010) |
Add the codepoints from your network's IPQoS configuration files to the appropriate files on the diffserv router.
The codepoints you supply should help to configure the router's diffserv scheduling mechanism. Refer to the router manufacturers' documentation and web sites for instructions.