In the following example, a customer needs a router that uses a QoS concept with four QoS classes on the connection. The classes are defined as VoIP, Gold, Silver and Best Effort.
Each service class is allocated 25% of the bandwidth. The customer tags their packets using DSCP so that the packets can be assigned to the correct queue in the router.
If more data is transmitted in the defined service class than there is bandwidth available, this data is discarded. A reversion to the Best Effort service class is not permitted. The definition is as follows:
| Class | DSCP |
|---|---|
| VOIP | EF |
| Gold | CS3 |
| Silver | CS2 |
| Best effort | 0 |
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Create the three templates for the service classes VOIP, GOLD and SILVER. The Best Effort class does not need to be configured manually as it is present by default.
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Create a list that specifies a strict order for the classes you create. The first class in the list has the highest priority.
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Finally, the configured list must be assigned to a WAN interface. In this example we take DSL. Switch to the dialog .
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(Optional): Depending on the WAN interface used, the available data rate in the case of an Ethernet connection must still be configured. This is not necessary if an internal xDSL modem is used. In this case, the synchronized DSL data rate is used. Switch to the dialog .
The packet statistics and the distribution into the queues can be viewed on the CLI under /status/WAN/QoS/Statistics can be retrieved (abbreviated version here):
root@:/ > ls /status/WAN/QoS/Statistics Interface Priority Queue-Name Pre-Classified DSCP-Classified Total-Classified =======================-------------------------------------------------------------------------------------- DSL-1 0 #urgent 0 0 0 DSL-1 1 VOIP 0 0 0 DSL-1 2 GOLD 0 0 0 DSL-1 3 SILVER 0 0 0 DSL-1 4 #best-effort 0 0 0
