Classify Diffserv COS/TOS Traffic

Many routing protocols make routing decisions based on the Type of Service (TOS) field in the IP header. This field is an indicator of the quality of service that is expected. Applications can set this field to tell routers how to prioritize packets. For example, weighted fair queuing (WFQ) algorithms in routers use this information.

The TOS field contains two subfields: IP Precedence (also known as the Class of Service — COS) and Type of Service (TOS). You can tell PacketWise to match on IP precedence and/or TOS during classification of IP protocols, then apply specific policies to manage these traffic types. For details on using a policy to substitute an IP precedence value, see Substitute Diffserv Values.

Note: To perform this task from PolicyCenter, you must first select a configuration from the Editing Configuration drop-down list at the top of the page.

To set up a Diffserv COS/TOS matching rule:

1. When creating a class or adding a matching rule, click diffserv. The Matching Rule: Diffserv window opens.

2. Select COS/TOS for the Diffserv Type.  show screen

3. Enter the IP Precedence (COS) value (0–7) or a range of values.

4. Enter the Type of Service (TOS) value. Common values are listed on the screen.

5. Click OK.

6. Click add class or add rule.

See also:

Classify Diffserv Code Point Traffic