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QoS example article

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@@ -19,6 +19,7 @@ This chapter contains various configuration examples:
    l3vpn-hub-and-spoke
    inter-vrf-routing-vrf-lite
    openvpn-ldap
+   qos
 
 
 Configuration Blueprints (autotest)
diff --git a/docs/configexamples/qos.rst b/docs/configexamples/qos.rst
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@@ -0,0 +1,183 @@
+:lastproofread: 2023-02-18
+
+.. _examples-qos:
+
+###########
+QoS example
+###########
+
+Configuration 'dcsp' and shaper using QoS
+=========================================
+
+In this case, we'll try to make a simple lab using QoS and the general ability of the VyOS system.
+Before we recommend you noticed the main article about QoS
+
+| :ref:configuration/trafficpolicy/index:qos
+
+Using the general schema for example:
+
+.. image:: /_static/images/qos1.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+We have four hosts on the local network 172.17.1.0/24. All hosts are labeled CS0 by default. We need to replace labels on all hosts except vpc8.
+We will replace the labels on the nearest router “VyOS3” using the IP addresses of the sources.
+
+* 172.17.1.2 CS0 -> CS4
+* 172.17.1.3 CS0 -> CS5
+* 172.17.1.4 CS0 -> CS6
+* 172.17.1.40 CS0 by default
+
+Next, we will replace only all CS4 labels on the “VyOS2” router.
+
+* CS4 -> CS5
+
+In the end, we will configure the traffic shaper using QoS mechanisms on the “VYOS2” router.
+
+Configuration:
+==============
+
+Set IP addresses on all VPCs and a default gateway 172.17.1.1. We'll use in this case only static routes. 
+On the VyOS3 router, we need to change the 'dscp' labels for the VPCs. To do this, we use this configuration.
+
+.. code-block:: none
+
+	set interfaces ethernet eth0 address '10.1.1.100/24'
+	set interfaces ethernet eth0 traffic-policy out 'vyos3'
+	set interfaces ethernet eth1 address '172.17.1.1/24'
+	set protocols static route 0.0.0.0/0 next-hop 10.1.1.1
+	set traffic-policy shaper vyos3 class 10 match ADDRESS10 ip source address '172.17.1.2/32'
+	set traffic-policy shaper vyos3 class 10 set-dscp 'CS4'
+	set traffic-policy shaper vyos3 class 20 match ADDRESS20 ip source address '172.17.1.3/32'
+	set traffic-policy shaper vyos3 class 20 set-dscp 'CS5'
+	set traffic-policy shaper vyos3 class 30 match ADDRESS20 ip source address '172.17.1.4/32'
+	set traffic-policy shaper vyos3 class 30 set-dscp 'CS6'
+	set traffic-policy shaper vyos3 default bandwidth '10%'
+	set traffic-policy shaper vyos3 default ceiling '100%'
+	set traffic-policy shaper vyos3 default priority '7'
+	set traffic-policy shaper vyos3 default queue-type 'fair-queue'
+
+Main rules:
+
+* ADDRESS10 change CS0 -> CS4 source 172.17.1.2/32
+* ADDRESS20 change CS0 -> CS5 source 172.17.1.3/32
+* ADDRESS30 change CS0 -> CS6 source 172.17.1.4/32
+
+
+Check the result
+
+.. image:: /_static/images/qos2.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+Before the interface eth0 on router VyOS3
+
+.. image:: /_static/images/qos3.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+After the interface eth0 on router VyOS3
+
+.. image:: /_static/images/qos4.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+On the router, VyOS4 set all traffic as CS4. We have to configure the default class and class for changing all labels from CS0 to CS4
+
+.. code-block:: none
+
+	set interfaces ethernet eth0 address '10.2.1.100/24'
+	set interfaces ethernet eth0 traffic-policy out 'vyos4'
+	set protocols static route 0.0.0.0/0 next-hop 10.2.1.1
+	set traffic-policy shaper vyos4 class 10 bandwidth '100%'
+	set traffic-policy shaper vyos4 class 10 burst '15k'
+	set traffic-policy shaper vyos4 class 10 match ALL ether protocol 'all'
+	set traffic-policy shaper vyos4 class 10 queue-type 'fair-queue'
+	set traffic-policy shaper vyos4 class 10 set-dscp 'CS4'
+	set traffic-policy shaper vyos4 default bandwidth '10%'
+	set traffic-policy shaper vyos4 default burst '15k'
+	set traffic-policy shaper vyos4 default ceiling '100%'
+	set traffic-policy shaper vyos4 default priority '7'
+	set traffic-policy shaper vyos4 default queue-type 'fair-queue'
+
+Next on the router VyOS2 we will change labels on all incoming traffic only from CS4-> CS6
+
+.. image:: /_static/images/qos5.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+.. code-block:: none
+
+	set interfaces ethernet eth0 address '10.1.1.1/24'
+	set interfaces ethernet eth1 address '10.2.1.1/24'
+	set interfaces ethernet eth2 address '10.9.9.1/24'
+	set interfaces ethernet eth2 traffic-policy out 'vyos2'
+	set protocols static route 172.17.1.0/24 next-hop 10.1.1.100
+	set traffic-policy shaper vyos2 class 10 bandwidth '100%'
+	set traffic-policy shaper vyos2 class 10 burst '15k'
+	set traffic-policy shaper vyos2 class 10 match VYOS2 ip dscp 'CS4'
+	set traffic-policy shaper vyos2 class 10 queue-type 'fair-queue'
+	set traffic-policy shaper vyos2 class 10 set-dscp 'CS5'
+	set traffic-policy shaper vyos2 default bandwidth '100%'
+	set traffic-policy shaper vyos2 default burst '15k'
+	set traffic-policy shaper vyos2 default ceiling '100%'
+	set traffic-policy shaper vyos2 default priority '7'
+	set traffic-policy shaper vyos2 default queue-type 'fair-queue'
+
+.. image:: /_static/images/qos6.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+* 172.17.1.2/24 CS0 
+
+.. image:: /_static/images/qos7.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+* 172.17.1.2/24 CS0 - > CS4
+
+.. image:: /_static/images/qos8.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+* 172.17.1.2/24 CS4 - > CS5
+
+.. image:: /_static/images/qos9.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+In the end, on the router “VyOS2” we will set outgoing bandwidth limits between the “VyOS3” and “VyOS1” routers. Let's set a limit for IP 10.1.1.100 = 5 Mbps(Tx). We will check the result of the work with the help of the “iPerf” utility.
+
+Set up bandwidth limits on the eth2 interface of the router “VyOS2”.
+
+.. code-block:: none
+
+
+	vyos@vyos2# show traffic-policy shaper vyos2 class 20
+	bandwidth 5mbit
+	description "for VyOS3 eth0"
+	match VyOS3 {
+		ip {
+			source {
+				address 10.1.1.100/32
+			}
+		}
+	}
+
+Check the result.
+
+.. image:: /_static/images/qos10.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+As we see shaper is working and the traffic will not work over 5 Mbit/s.