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diff --git a/docs/ch10-qos.rst b/docs/ch10-qos.rst new file mode 100644 index 00000000..3dba8e71 --- /dev/null +++ b/docs/ch10-qos.rst @@ -0,0 +1,65 @@ +QoS and Traffic Policy +====================== + +The traffic policy subsystem provides an interface to Linux traffic control. + +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-block:: sh + + set traffic-policy shaper-hfsc + +See further information on the QoS_ page. + +.. _HFSC: https://en.wikipedia.org/wiki/Hierarchical_fair-service_curve +.. _QoS: https://wiki.vyos.net/wiki/QoS |