Tools for Creating a QoS Policy
The QoS policy for your network resides in the IPQoS configuration file. You
create this configuration file with a text editor. Then, you provide the
file as an argument to ipqosconf, the IPQoS configuration utility. When you instruct ipqosconf
to apply the policy that is defined in your configuration file, the policy
is written into the kernel IPQoS system. For detailed information about the ipqosconf
command, refer to the ipqosconf(1M) man page. For instructions on the use
of ipqosconf, refer to How to Apply a New Configuration to the IPQoS Kernel Modules.
Basic IPQoS Configuration File
An IPQoS configuration file consists of a tree of action statements that implement
the QoS policy that you defined in Planning the Quality-of-Service Policy. The IPQoS configuration file
configures the IPQoS modules. Each action statement contains a set of classes, filters,
or parameters to be processed by the module that is called in the
For the complete syntax of the IPQoS configuration file, refer to Example 37-3
and the ipqosconf(1M) man page.
Configuring the IPQoS Example Topology
The tasks in this chapter explain how to create IPQoS configuration files for
three IPQoS-enabled systems. These systems are part of the network topology of the
company BigISP, which was introduced in Figure 33-4.
Goldweb – A web server that hosts web sites for customers who have purchased premium-level SLAs
Userweb – A less-powerful web server that hosts personal web sites for home users who have purchased “best-effort” SLAs
BigAPPS – An application server that serves mail, network news, and FTP to both gold-level and best-effort customers
These three configuration files illustrate the most common IPQoS configurations. You might use
the sample files that are shown in the next section as templates
for your own IPQoS implementation.