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 (Quality of Service) 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 (Access Control List) QoS setting overrides the QoS DiffServ configuration.

Published March 2020prev | next

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