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+.. _twovppinstances:
+
+.. toctree::
+
+Connecting Two FD.io VPP Instances
+==================================
+
+.. _background-1:
+
+memif is a very high performance, direct memory interface type which can
+be used between FD.io VPP instances. It uses a file socket for a control channel
+to set up shared memory.
+
+.. _skills-to-be-learned-1:
+
+Skills to be Learned
+---------------------
+
+You will learn the following new skill in this exercise:
+
+#. Create a memif interface between two FD.io VPP instances
+
+You should be able to perform this exercise with the following skills
+learned in previous exercises:
+
+#. Run a second FD.io VPP instance
+#. Add an ip address to a FD.io VPP interface
+#. Ping from FD.io VPP
+
+.. _topology-1:
+
+Topology
+---------
+
+.. figure:: /_images/Connecting_two_vpp_instances_with_memif.png
+ :alt: Connect two FD.io VPP topology
+
+ Connect two FD.io VPP topology
+
+.. _initial-state-1:
+
+Initial state
+--------------
+
+The initial state here is presumed to be the final state from the
+exercise `Create an
+Interface <VPP/Progressive_VPP_Tutorial#Exercise:_Create_an_Interface>`__
+
+.. _action-running-a-second-vpp-instances-1:
+
+Running a second FD.io VPP instances
+-------------------------------------
+
+You should already have a FD.io VPP instance running named: vpp1.
+
+Run a second FD.io VPP instance named: vpp2.
+
+.. code-block:: console
+
+ $ sudo /usr/bin/vpp -c startup2.conf
+ ....
+ $ sudo vppctl -s /run/vpp/cli-vpp2.sock
+ _______ _ _ _____ ___
+ __/ __/ _ \ (_)__ | | / / _ \/ _ \
+ _/ _// // / / / _ \ | |/ / ___/ ___/
+ /_/ /____(_)_/\___/ |___/_/ /_/
+
+ vpp# show version
+ vpp v18.07-release built by root on c469eba2a593 at Mon Jul 30 23:27:03 UTC 2018
+ vpp# quit
+
+.. _action-create-memif-interface-on-vpp1-1:
+
+Create memif interface on vpp1
+-------------------------------
+
+Create a memif interface on vpp1. To connect to the instance vpp1 use the
+socket **/run/vpp/cli-vpp1.sock**
+
+.. code-block:: console
+
+ $ sudo vppctl -s /run/vpp/cli-vpp1.sock
+ vpp# create interface memif id 0 master
+
+This will create an interface on vpp1 memif0/0 using /run/vpp/memif as
+its socket file. The role of vpp1 for this memif inteface is 'master'.
+
+With what you have learned:
+
+#. Set the memif0/0 state to up.
+#. Assign IP address 10.10.2.1/24 to memif0/0
+#. Examine memif0/0 via show commands
+
+.. _action-create-memif-interface-on-vpp2-1:
+
+Create memif interface on vpp2
+--------------------------------
+
+We want vpp2 to pick up the 'slave' role using the same
+run/vpp/memif-vpp1vpp2 socket file
+
+.. code-block:: console
+
+ vpp# create interface memif id 0 slave
+
+This will create an interface on vpp2 memif0/0 using /run/vpp/memif as
+its socket file. The role of vpp1 for this memif inteface is 'slave'.
+
+Use your previously used skills to:
+
+#. Set the memif0/0 state to up.
+#. Assign IP address 10.10.2.2/24 to memif0/0
+#. Examine memif0/0 via show commands
+
+.. _action-ping-from-vpp1-to-vpp2-1:
+
+Ping from vpp1 to vpp2
+------------------------
+
+Ping 10.10.2.2 from vpp1
+
+.. code-block:: console
+
+ $ ping 10.10.2.2
+
+Ping 10.10.2.1 from vpp2
+
+.. code-block:: console
+
+ $ ping 10.10.2.1