DiffServ Example

In this example, we use DiffServ to signal a class of service throughput and assign any traffic coming from network 10.1.2.x with a specific DSCP. This allows all other network switches to send and observe the DSCP instead of repeating the same QoS configuration on every network switch.

To configure the switch:

Using ACLs, assign a traffic grouping for traffic from network 10.1.2.x to QP3:

configure access-list qp3sub any

The following is a sample policy file example:

#filename: qp3sub.pol
entry QP3-subnet {
    if {
        source-address 10.1.2.0/24
     } then {
        Qosprofile qp3;
        replace-dscp;
        }

Configure the switch so that other switches can signal calls of service that this switch should observe.
```
enable diffserv examination ports all
```
Note
The switch only observes the DSCPs if the traffic does not match the configured access list. Otherwise, the ACL QoS setting overrides the QoS DiffServ configuration.