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diff --git a/docs/apex/APEX-PCVS-Example.rst b/docs/apex/APEX-PCVS-Example.rst deleted file mode 100644 index 380a2585..00000000 --- a/docs/apex/APEX-PCVS-Example.rst +++ /dev/null @@ -1,916 +0,0 @@ -.. This work is licensed under a Creative Commons Attribution 4.0 International License. -.. http://creativecommons.org/licenses/by/4.0 - -.. _apex-PCVSExample: - -Policy-controlled Video Streaming (pcvs) with APEX -************************************************** - -.. contents:: - :depth: 3 - -Introduction -^^^^^^^^^^^^ - - .. container:: sectionbody - - .. container:: paragraph - - This module contains several demos for - Policy-controlled Video Streaming (PCVS). Each demo - defines a policy using AVRO and Javascript (or other - scripting languages for the policy logic). To run the - demo, a vanilla Ubuntu server with some extra software packages is required: - - .. container:: ulist - - - Mininet as network simulator - - - Floodlight as SDN controller - - - Kafka as messaging system - - - Zookeeper for Kafka configuration - - - APEX for policy control - -Install Ubuntu Server and SW -^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - - .. container:: sect1 - - .. rubric:: Install Demo - :name: install_demo - - .. container:: sectionbody - - .. container:: paragraph - - Requirements: - - .. container:: ulist - - - Ubuntu server: 1.4 GB - - - Ubuntu with Xubuntu Desktop, git, Firefox: 2.3 GB - - - Ubuntu with all, system updated: 3 GB - - - With ZK, Kafka, VLC, Mininet, Floodlight, Python: - 4.4 GB - - - APEX Build (M2 and built): M2 ~ 2 GB, APEX ~3.5 GB - - - APEX install (not build locally): ~ 300 MB - - .. container:: paragraph - - On a Ubuntu OS (install a stable or LTS server first) - - .. container:: listingblock - - .. container:: content - - :: - - # pre for Ubuntu, tools and X - sudo apt-get -y install --no-install-recommends software-properties-common - sudo apt-get -y install --no-install-recommends build-essential - sudo apt-get -y install --no-install-recommends git - sudo aptitude -y install --no-install-recommends xubuntu-desktop - sudo apt-get -y install --no-install-recommends firefox - - - # install Java - sudo add-apt-repository ppa:webupd8team/java - sudo apt-get update - sudo apt-get -y install --no-install-recommends oracle-java8-installer - java -version - - - # reboot system, run system update, then continue - - # if VBox additions are needed, install and reboot - sudo (cd /usr/local/share; wget https://www.virtualbox.org/download/testcase/VBoxGuestAdditions_5.2.7-120528.iso) - sudo mount /usr/local/share/VBoxGuestAdditions_5.2.7-120528.iso /media/cdrom - sudo (cd /media/cdrom;VBoxLinuxAdditions.run) - - - # update apt-get DB - sudo apt-get update - - # if APEX is build from source, install maven and rpm - sudo apt-get install maven rpm - - # install ZooKeeper - sudo apt-get install zookeeperd - - # install Kafka - (cd /tmp;wget http://ftp.heanet.ie/mirrors/www.apache.org/dist/kafka/1.0.0/kafka_2.12-1.0.0.tgz --show-progress) - sudo mkdir /opt/Kafka - sudo tar -xvf /tmp/kafka_2.12-1.0.0.tgz -C /opt/Kafka/ - - # install mininet - cd /usr/local/src - sudo git clone https://github.com/mininet/mininet.git - (cd mininet;util/install.sh -a) - - # install floodlight, requires ant - sudo apt-get install ant - cd /usr/local/src - sudo wget --no-check-certificate https://github.com/floodlight/floodlight/archive/master.zip - sudo unzip master.zip - cd floodlight-master - sudo ant - sudo mkdir /var/lib/floodlight - sudo chmod 777 /var/lib/floodlight - - # install python pip - sudo apt-get install python-pip - - # install kafka-python (need newer version from github) - cd /usr/local/src - sudo git clone https://github.com/dpkp/kafka-python - sudo pip install ./kafka-python - - # install vlc - sudo apt-get install vlc - - .. container:: paragraph - - Install APEX either from source or from a distribution - package. See the APEX documentation for details. We - assume that APEX is installed in - ``/opt/ericsson/apex/apex`` - - .. container:: paragraph - - Copy the LinkMonitor file to Kafka-Python - - .. container:: listingblock - - .. container:: content - - :: - - sudo cp /opt/ericsson/apex/apex/examples/scripts/pcvs/vpnsla/LinkMonitor.py /usr/local/src/kafka-python - - .. container:: paragraph - - Change the Logback configuration in APEX to logic - logging - - .. container:: listingblock - - .. container:: content - - :: - - (cd /opt/ericsson/apex/apex/etc; sudo cp logback-logic.xml logback.xml) - - .. container:: sect1 - - .. rubric:: Get the Demo Video - :name: get_the_demo_video - - .. container:: sectionbody - - .. container:: ulist - - - For all download options of the movie please visit - http://bbb3d.renderfarming.net/download.html - - - For lower-res downloads and mirrors see - https://peach.blender.org/download - - .. container:: listingblock - - .. container:: content - - :: - - sudo mkdir /usr/local/src/videos - - .. container:: paragraph - - Standard 720p (recommended) - - .. container:: listingblock - - .. container:: content - - :: - - (cd /usr/local/src/videos; sudo curl -o big_buck_bunny_480p_surround.avi http://download.blender.org/peach/bigbuckbunny_movies/big_buck_bunny_480p_surround-fix.avi) - - .. container:: paragraph - - Full HD video - - .. container:: listingblock - - .. container:: content - - :: - - (cd videos; sudo curl -o bbb_sunflower_1080p_60fps_normal.mp4 http://distribution.bbb3d.renderfarming.net/video/mp4/bbb_sunflower_1080p_60fps_normal.mp4) - - - -VPN SLA Demo -^^^^^^^^^^^^ - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - This demo uses a network with several central office - and core switches, over which two VPNs are run. A - customer ``A`` has two location ``A1`` and ``A2`` and - a VPN between them. A customer ``B`` has two location - ``B1`` and ``B2`` and a VPN between them. - - .. container:: imageblock - - .. container:: content - - |VPN SLA Architecture| - - .. container:: paragraph - - The architecture above shows the scenario. The - components are realized in this demo as follows: - - .. container:: ulist - - - *CEP / Analytics* - a simple Python script taking - events from Kafka and sending them to APEX - - - *APEX / Policy* - the APEX engine running the VPA - SLA policy - - - *Controller* - A vanilla Floodlight controller - taking events from the Link Monitor and configuring - Mininet - - - *Network* - A network created using Mininet - - .. container:: paragraph - - The demo requires to start some software (detailed - below). To show actual video streams, we use ``VLC``. - If you do not want to show video streams, but only the - policy, skip the ``VLC`` section. - - .. container:: paragraph - - All shown scripts are available in a full APEX - installation in - ``$APEX_HOME/examples/scripts/pcvs/vpnsla``. - - .. container:: sect2 - - .. rubric:: Start all Software - :name: start_all_software - - .. container:: paragraph - - Create environment variables in a file, say - ``env.sh``. In each new Xterm - - .. container:: ulist - - - Source these environment settings, e.g. - ``. ./env.sh`` - - - Run the commands below as root (``sudo`` per - command or ``sudo -i`` for interactive mode as - shown below) - - .. container:: listingblock - - .. container:: content - - :: - - #!/usr/bin/env bash - - export src_dir=/usr/local/src - export APEX_HOME=/opt/ericsson/apex/apex - export APEX_USER=apexuser - - .. container:: paragraph - - In a new Xterm, start Floodlight - - .. container:: listingblock - - .. container:: content - - :: - - sudo -i - . ./env.sh - cd $src_dir/floodlight-master && java -jar target/floodlight.jar - - .. container:: paragraph - - In a new Xterm start Mininet - - .. container:: listingblock - - .. container:: content - - :: - - sudo -i - . ./env.sh - mn -c && python $APEX_HOME/examples/scripts/pcvs/vpnsla/MininetTopology.py - - .. container:: paragraph - - In a new Xterm, start Kafka - - .. container:: listingblock - - .. container:: content - - :: - - sudo -i - . ./env.sh - /opt/Kafka/kafka_2.12-1.0.0/bin/kafka-server-start.sh /opt/Kafka/kafka_2.12-1.0.0/config/server.properties - - .. container:: paragraph - - In a new Xerm start APEX with the Kafka - configuration for this demo - - .. container:: listingblock - - .. container:: content - - :: - - cd $APEX_HOME - ./bin/apexApps.sh engine -c examples/config/pcvs/vpnsla/kafka2kafka.json - - .. container:: paragraph - - In a new Xterm start the Link Monitor. The Link - Monitor has a 30 second sleep to slow down the - demonstration. So the first action of it comes 30 - seconds after start. Every new action in 30 second - intervals. - - .. container:: listingblock - - .. container:: content - - :: - - sudo -i - . ./env.sh - cd $src_dir - xterm -hold -e 'python3 $src_dir/kafka-python/LinkMonitor.py' & - - .. container:: paragraph - - Now all software should be started and the demo is - running. The Link Monitor will send link up events, - picked up by APEX which triggers the policy. Since - there is no problem, the policy will do nothing. - - .. container:: sect2 - - .. rubric:: Create 2 Video Streams with VLC - :name: create_2_video_streams_with_vlc - - .. container:: paragraph - - In the Mininet console, type ``xterm A1 A2`` and - ``xterm B1 B2`` to open terminals on these nodes. - - .. container:: paragraph - - ``A2`` and ``B2`` are the receiving nodes. In these - terminals, run ``vlc-wrapper``. In each opened VLC - window do - - .. container:: ulist - - - Click Media → Open Network Stream - - - Give the URL as ``rtp://@:5004`` - - .. container:: paragraph - - ``A1`` and ``B1`` are the sending nodes (sending - the video stream) In these terminals, run - ``vlc-wrapper``. In each opened VLC window do - - .. container:: ulist - - - Click Media → Stream - - - Add the video (from ``/usr/local/src/videos``) - - - Click ``Stream`` - - - Click ``Next`` - - - Change the destination - ``RTP / MPEG Transport Stream`` and click - ``Add`` - - - Change the address and type to ``10.0.0.2`` in - ``A1`` and to ``10.0.0.4`` in ``B1`` - - - Turn off ``Active Transcoding`` (this is - important to minimize CPU load) - - - Click ``Next`` - - - Click ``Stream`` - - .. container:: paragraph - - The video should be streaming across the network - from ``A1`` to ``A2`` and from ``B1`` to ``B2``. If - the video streams a slow or interrupted the CPU - load is too high. In these cases either try a - better machine or use a different (lower quality) - video stream. - - .. container:: sect2 - - .. rubric:: Take out L09 and let the Policy do it’s - Magic - :name: take_out_l09_and_let_the_policy_do_it_s_magic - - .. container:: paragraph - - Now it is time to take out the link ``L09``. This - will be picked up by the Link Monitor, which sends - a new event (L09 DOWN) to the policy. The policy - then will calculate which customer should be - impeded (throttled). This will continue, until SLAs - are violated, then a priority calculation will kick - in (Customer ``A`` is prioritized in the setup). - - .. container:: paragraph - - To initiate this, simply type ``link s5 s6 down`` - in the Mininet console followed by ``exit``. - - .. container:: paragraph - - If you have the video streams running, you will see - one or the other struggeling, depending on the - policy decision. - - .. container:: sect2 - - .. rubric:: Reset the Demo - :name: reset_the_demo - - .. container:: paragraph - - If you want to reset the demo, simple stop (in this - order) the following process - - .. container:: ulist - - - Link Monitor - - - APEX - - - Mininet - - - Floodlight - - .. container:: paragraph - - Then restart them in this order - - .. container:: ulist - - - Floodlight - - - Mininet - - - APEX - - - Link Monitor - - .. container:: sect2 - - .. rubric:: Monitor the Demo - :name: monitor_the_demo - - .. container:: paragraph - - Floodlight and APEX provide REST interfaces for - monitoring. - - .. container:: ulist - - - Floodlight: see `Floodlight - Docs <https://floodlight.atlassian.net/wiki/spaces/floodlightcontroller/pages/40403023/Web+GUI>`__ - for details on how to access the monitoring. In - a standard installation as we use here, pointing - browser to the URL - ``http://localhost:8080/ui/pages/index.html`` - should work on the same host - -VPN SLA Policy -^^^^^^^^^^^^^^ - - .. container:: sectionbody - - .. container:: paragraph - - The VPN SLA policy is designed as a MEDA policy. The - first state (M = Match) takes the trigger event (a - link up or down) and checks if this is a change to the - known topology. The second state (E = Establish) takes - all available information (trigger event, local - context) and defines what situation we have. The third - state (D = Decide) takes the situation and selects - which algorithm is best to process it. This state can - select between ``none`` (nothing to do), ``solved`` (a - problem is solved now), ``sla`` (compare the current - customer SLA situation and select one to impede), and - ``priority`` (impede non-priority customers). The - fourth and final state (A = Act) selects the right - action for the taken decision and creates the response - event sent to the orchestrator. - - .. container:: paragraph - - We have added three more policies to set the local - context: one for adding nodes, one for adding edges - (links), and one for adding customers. These policies - do not realize any action, they are only here for - updating the local context. This mechanism is the - fasted way to update local context, and it is - independent of any context plugin. - - .. container:: paragraph - - The policy uses data defined in Avro, so we have a - number of Avro schema definitions. - -Context Schemas ---------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The context schemas are for the local context. We - model edges and nodes for the topology, customers, and - problems with all information on detected problems. - - .. container:: ulist - - - |avroSchemaEdges_link| - - |avroSchemaNodes_link| - - |avroSchemaCustomers_link| - - -Trigger Schemas ---------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The trigger event provides a status as ``UP`` or - ``DOWN``. To avoid tests for these strings in the - logic, we defined an Avro schema for an enumeration (|avroSchemaLinkStatus_link|). - This does not impact the trigger system (it can still - send the strings), but makes the task logic simpler. - - - -Context Logic Nodes -------------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The node context logic simply takes the trigger event - (for context) and creates a new node in the local - context topology (|cntxtNodes_link|). - -Context Logic Edges -------------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The edge context logic simply takes the trigger event - (for context) and creates a new edge in the local - context topology (|cntxtEdges_link|). - - -Context Logic Customer ----------------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The customer context logic simply takes the trigger - event (for context) and creates a new customer in the - local context topology (|cntxtCustomer_link|). - - -Logic: Match ------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - This is the logic for the match state. It is kept very - simple. Beside taking the trigger event, it also - creates a timestamp. This timestamp is later used for - SLA and downtime calculations as well as for some - performance information of the policy . - Sample |taskMatch_link| - - -Logic: Policy Establish State ------------------------------ - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - This is the logic for the establish state. It is the - most complicated logic, since establishing a situation - for a decision is the most important part of any - policy. First, the policy describes what we find (the - switch block), in terms of 8 normal situations and 1 - extreme error case. - - .. container:: paragraph - - If required, it creates local context information for - the problem (if it is new) or updates it (if the - problem still exists). It also calculates customer SLA - downtime and checks for any SLA violations. Finally, - it creates a situation object. - Sample |taskEstablish_link| - -Logic: Policy Decide State --------------------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The decide state can select between different - algorithms depending on the situation. So it needs a - Task Selection Logic (TSL). This TSL select a task in - the current policy execution (i.e. potentially a - different one per execution). - Sample |tslDecide_Link| - - .. container:: paragraph - - The actual task logic are then ``none``, ``solved``, - ``sla``, and ``priority``. - Sample task logic are as given below : - - .. container:: ulist - - - |taskDecideNone_link| - - |taskDecideSolved_Link| - - |taskDecideSla_link| - - |taskDecidePriority_Link| - - -Logic: Policy Act State ------------------------ - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - This is the logic for the act state. It is simply - selecting an action, and creating the repsonse event - for the orchestrator (the output of the policy). - Sample |taskAct_link| - -CLI Spec --------- - - .. container:: sect1 - - .. rubric:: Complete Policy Definition - :name: complete_policy_definition - - .. container:: sectionbody - - .. container:: paragraph - - The complete policy definition is realized using the - APEX CLI Editor. The script below shows the actual - policy specification. All logic and schemas are - included (as macro file). - Sample |vpnsla-apex_link| - - -Context Events Nodes --------------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The following events create all nodes of the topology. - - .. container:: ulist - - - |ctxtNodesJson_link| - - -Context Events Edges --------------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The following events create all edges of the topology. - - .. container:: ulist - - - |ctxtEdgesJson_link| - - -Context Events Customers ------------------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The following events create all customers of the topology. - - .. container:: ulist - - - |ctxtCustomerJson_link| - - -Trigger Examples ----------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The following events are examples for trigger events - - .. container:: ulist - - - |triggerEdgeJson_link| - -Link Monitor ------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The Link Monitor is a Python script. At startup, it - sends the context events to APEX to initialize the - topology and the customers. Then it takes events from - Kafka and sends them to APEX. - Sample |linkMonitor_link| - -Mininet Topology ----------------- - - .. container:: sect1 - - .. container:: sectionbody - - .. container:: paragraph - - The topology is realized using Mininet. This - script is used to establish the topology and to realize - network configurations. - Sample |mininetTopology_link| - - - .. container:: - :name: footer-text - - 2.3.0-SNAPSHOT - Last updated 2020-04-03 16:04:24 IST - - -.. |VPN SLA Architecture| image:: images/pcvs/vpnsla-arch.png - -.. |avroSchemaEdges_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/avro/topology-edges.avsc" target="_blank">AVRO Schema Edges</a> -.. |avroSchemaNodes_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src//main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/avro/topology-nodes.avsc" target="_blank">AVRO Schema Nodes</a> -.. |avroSchemaCustomers_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/avro/customers.avsc" target="_blank">AVRO Schema Customers</a> -.. |avroSchemaLinkStatus_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/avro/link-status.avsc" target="_blank">AVRO Schema Link Status</a> -.. |cntxtNodes_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/ctxt-nodes.js" target="_blank">Logic Node Context</a> -.. |cntxtEdges_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/ctxt-edges.js" target="_blank">Logic Edge Context</a> -.. |cntxtCustomer_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/ctxt-customer.js" target="_blank">Logic Customer Context</a> -.. |taskMatch_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-match.js" target="_blank">Logic Policy Match State</a> -.. |taskEstablish_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-establish.js" target="_blank">Logic Policy Establish State</a> -.. |tslDecide_Link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/tsl-decide.js" target="_blank">JS Logic Policy Decide State - TSL</a> -.. |taskDecideNone_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-decide-none.js" target="_blank">Logic: Decide None</a> -.. |taskDecideSolved_Link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-decide-solved.js" target="_blank">Logic: Decide Solved</a> -.. |taskDecideSla_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-decide-sla.js" target="_blank">Logic: Decide SLA</a> -.. |taskDecidePriority_Link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-decide-priority.js" target="_blank">Logic: Decide Priority</a> -.. |taskAct_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/logic/task-act.js" target="_blank">Logic Policy Act State</a> -.. |vpnsla-apex_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/org/onap/policy/apex/examples/pcvs/vpnsla/vpnsla.apex" target="_blank">APEX VPN SLA Policy Specification</a> -.. |ctxtNodesJson_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/examples/events/pcvs/vpnsla/CtxtNodes.json" target="_blank">Context Events Nodes</a> -.. |ctxtEdgesJson_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/examples/events/pcvs/vpnsla/CtxtEdges.json" target="_blank">Context Events Edges</a> -.. |ctxtCustomerJson_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/examples/events/pcvs/vpnsla/CtxtCustomers.json" target="_blank">Context Events Customers</a> -.. |triggerEdgeJson_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/examples/events/pcvs/vpnsla/Trigger_Edge09.json" target="_blank">Trigger Examples</a> -.. |linkMonitor_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/examples/scripts/pcvs/vpnsla/LinkMonitor.py" target="_blank">Link Monitor</a> -.. |mininetTopology_link| raw:: html - - <a href="https://github.com/onap/policy-apex-pdp/tree/master/examples/examples-pcvs/src/main/resources/examples/scripts/pcvs/vpnsla/MininetTopology.py" target="_blank">Mininet Topology</a> |