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@@ -101,3 +101,64 @@ Commit changes, save the configuration, and exit configuration mode:
Done
vyos@vyos# exit
vyos@vyos$
+
+Basic QoS
+---------
+
+The traffic policy subsystem provides an interface to Linux traffic control
+(tc_).
+
+One common use of traffic policy is to limit bandwidth for an interface. In
+the example below we limit bandwidth for our LAN connection to 200 Mbit download
+and out WAN connection to 50 Mbit upload:
+
+.. code-block:: sh
+
+ set traffic-policy shaper WAN-OUT bandwidth '50Mbit'
+ set traffic-policy shaper WAN-OUT default bandwidth '50%'
+ set traffic-policy shaper WAN-OUT default ceiling '100%'
+ set traffic-policy shaper WAN-OUT default queue-type 'fair-queue'
+ set traffic-policy shaper LAN-OUT bandwidth '200Mbit'
+ set traffic-policy shaper LAN-OUT default bandwidth '50%'
+ set traffic-policy shaper LAN-OUT default ceiling '100%'
+ set traffic-policy shaper LAN-OUT default queue-type 'fair-queue'
+
+Resulting in the following configuration:
+
+.. code-block:: sh
+
+ traffic-policy {
+ shaper WAN-OUT {
+ bandwidth 50Mbit
+ default {
+ bandwidth 50%
+ ceiling 100%
+ queue-type fair-queue
+ }
+ }
+ shaper LAN-OUT {
+ bandwidth 200Mbit
+ default {
+ bandwidth 50%
+ ceiling 100%
+ queue-type fair-queue
+ }
+ }
+ }
+
+Once defined, a traffic policy can be applied to each interface using the
+interface-level traffic-policy directive:
+
+.. code-block:: sh
+
+ set interfaces ethernet eth0 traffic-policy out 'WAN-OUT'
+ set interfaces ethernet eth1 traffic-policy out 'LAN-OUT'
+
+Note that a traffic policy can also be defined to match specific traffic
+flows using class statements.
+
+VyOS 1.2 (Crux) also supports HFSC (:code:`set traffic-policy shaper-hfsc`)
+
+See further information in the `QoS and Traffic Policy`_ chapter.
+
+.. _tc: http://en.wikipedia.org/wiki/Tc_(Linux)