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Test Environment
================

CSIT VPP functional tests are executed in FD.io VIRL testbeds. The
physical VIRL testbed infrastructure consists of three VIRL servers:

- tb4-virl1:

  - Status: Production
  - OS: Ubuntu 16.04.2
  - VIRL STD server version: 0.10.32.16
  - VIRL UWM server version: 0.10.32.16

- tb4-virl2:

  - Status: Production
  - OS: Ubuntu 16.04.2
  - VIRL STD server version: 0.10.32.16
  - VIRL UWM server version: 0.10.32.16

- tb4-virl3:

  - Status: Production
  - OS: Ubuntu 16.04.2
  - VIRL STD server version: 0.10.32.19
  - VIRL UWM server version: 0.10.32.19

- VIRL hosts: Cisco UCS C240-M4, each with 2x Intel Xeon E5-2699
  v3 (2.30 GHz, 18c), 512GB RAM.

Whenever a patch is submitted to gerrit for review, parallel VIRL
simulations are started to reduce the time of execution of all
functional tests. The number of parallel VIRL simulations is equal to a
number of test groups defined by TEST_GROUPS variable in
:file:`csit/bootstrap.sh` file. VIRL host to run VIRL simulation is
selected based on least load algorithm per VIRL simulation.

Every VIRL simulation uses the same three-node logical ring topology -
Traffic Generator (TG node) and two Systems Under Test (SUT1 and SUT2).
The appropriate pre-built VPP packages built by Jenkins for the patch
under review are then installed on the two SUTs, along with their
:file:`/etc/vpp/startup.conf` file, in all VIRL simulations.

SUT Settings - VIRL Guest VM
----------------------------

SUT VMs' settings are defined in `VIRL topologies directory`_

- List of SUT VM interfaces:

    <interface id="0" name="GigabitEthernet0/4/0"/>
    <interface id="1" name="GigabitEthernet0/5/0"/>
    <interface id="2" name="GigabitEthernet0/6/0"/>
    <interface id="3" name="GigabitEthernet0/7/0"/>

- Number of 2MB hugepages: 1024.

- Maximum number of memory map areas: 20000.

- Kernel Shared Memory Max: 2147483648 (vm.nr_hugepages * 2 * 1024 * 1024).

SUT Settings - VIRL Guest OS Linux
----------------------------------

In CSIT terminology, the VM operating system for both SUTs that |vpp-release|
has been tested with, is the following:

#. Ubuntu VIRL image

   This image implies Ubuntu 16.04.1 LTS, current as of yyyy-mm-dd (that is,
   package versions are those that would have been installed by a
   :command:`apt-get update`, :command:`apt-get upgrade` on that day), produced
   by CSIT disk image build scripts.

   The exact list of installed packages and their versions (including the Linux
   kernel package version) are included in `VIRL ubuntu images lists`_.

   A replica of this VM image can be built by running the :command:`build.sh`
   script in CSIT repository.

#. CentOS VIRL image

   This image implies Centos 7.4-1711, current as of yyyy-mm-dd (that is,
   package versions are those that would have been installed by a
   :command:`yum update`, :command:`yum upgrade` on that day), produced
   by CSIT disk image build scripts.

   The exact list of installed packages and their versions (including the Linux
   kernel package version) are included in `VIRL centos images lists`_.

   A replica of this VM image can be built by running the :command:`build.sh`
   script in CSIT repository.

#. Nested VM image

   In addition to the "main" VM image, tests which require VPP to communicate to
   a VM over a vhost-user interface, utilize a "nested" VM image.

   This "nested" VM is dynamically created and destroyed as part of a test case,
   and therefore the "nested" VM image is optimized to be small, lightweight and
   have a short boot time. The "nested" VM image is not built around any
   established Linux distribution, but is based on `BuildRoot
   <https://buildroot.org/>`_, a tool for building embedded Linux systems. Just
   as for the "main" image, scripts to produce an identical replica of the
   "nested" image are included in CSIT GIT repository, and the image can be
   rebuilt using the "build.sh" script at `VIRL nested`_.

DUT Settings - VPP
------------------

Every System Under Test runs VPP SW application in Linux user-mode as a Device
Under Test (DUT) node.

DUT Port Configuration
~~~~~~~~~~~~~~~~~~~~~~

Port configuration of DUTs is defined in topology file that is generated per
VIRL simulation based on the definition stored in `VIRL topologies directory`_.

Example of DUT nodes configuration:

::

    DUT1:
        type: DUT
        host: "10.30.51.157"
        arch: x86_64
        port: 22
        username: cisco
        honeycomb:
          user: admin
          passwd: admin
          port: 8183
          netconf_port: 2831
        priv_key: |
          -----BEGIN RSA PRIVATE KEY-----
          MIIEpgIBAAKCAQEAwUDlTpzSHpwLQotZOFS4AgcPNEWCnP1AB2hWFmvI+8Kah/gb
          v8ruZU9RqhPs56tyKzxbhvNkY4VbH5F1GilHZu3mLqzM4KfghMmaeMEjO1T7BYYd
          vuBfTvIluljfQ2vAlnYrDwn+ClxJk81m0pDgvrLEX4qVVh2sGh7UEkYy5r82DNa2
          4VjzPB1J/c8a9zP8FoZUhYIzF4FLvRMjUADpbMXgJMsGpaZLmz95ap0Eot7vb1Cc
          1LvF97iyBCrtIOSKRKA50ZhLGjMKmOwnYU+cP5718tbproDVi6VJOo7zeuXyetMs
          8YBl9kWblWG9BqP9jctFvsmi5G7hXgq1Y8u+DwIDAQABAoIBAQC/W4E0DHjLMny7
          0bvw2YKzD0Zw3fttdB94tkm4PdZv5MybooPnsAvLaXVV0hEdfVi5kzSWNl/LY/tN
          EP1BgGphc2QgB59/PPxGwFIjDCvUzlsZpynBHe+B/qh5ExNQcVvsIOqWI7DXlXaN
          0i/khOzmJ6HncRRah1spKimYRsaUUDskyg7q3QqMWVaqBbbMvLs/w7ZWd/zoDqCU
          MY/pCI6hkB3QbRo0OdiZLohphBl2ShABTwjvVyyKL5UA4jAEneJrhH5gWVLXnfgD
          p62W5CollKEYblC8mUkPxpP7Qo277zw3xaq+oktIZhc5SUEUd7nJZtNqVAHqkItW
          79VmpKyxAoGBAPfU+kqNPaTSvp+x1n5sn2SgipzDtgi9QqNmC4cjtrQQaaqI57SG
          OHw1jX8i7L2G1WvVtkHg060nlEVo5n65ffFOqeVBezLVJ7ghWI8U+oBiJJyQ4boD
          GJVNsoOSUQ0rtuGd9eVwfDk3ol9aCN0KK53oPfIYli29pyu4l095kg11AoGBAMef
          bPEMBI/2XmCPshLSwhGFl+dW8d+Klluj3CUQ/0vUlvma3dfBOYNsIwAgTP0iIUTg
          8DYE6KBCdPtxAUEI0YAEAKB9ry1tKR2NQEIPfslYytKErtwjAiqSi0heM6+zwEzu
          f54Z4oBhsMSL0jXoOMnu+NZzEc6EUdQeY4O+jhjzAoGBAIogC3dtjMPGKTP7+93u
          UE/XIioI8fWg9fj3sMka4IMu+pVvRCRbAjRH7JrFLkjbUyuMqs3Arnk9K+gbdQt/
          +m95Njtt6WoFXuPCwgbM3GidSmZwYT4454SfDzVBYScEDCNm1FuR+8ov9bFLDtGT
          D4gsngnGJj1MDFXTxZEn4nzZAoGBAKCg4WmpUPaCuXibyB+rZavxwsTNSn2lJ83/
          sYJGBhf/raiV/FLDUcM1vYg5dZnu37RsB/5/vqxOLZGyYd7x+Jo5HkQGPnKgNwhn
          g8BkdZIRF8uEJqxOo0ycdOU7n/2O93swIpKWo5LIiRPuqqzj+uZKnAL7vuVdxfaY
          qVz2daMPAoGBALgaaKa3voU/HO1PYLWIhFrBThyJ+BQSQ8OqrEzC8AnegWFxRAM8
          EqrzZXl7ACUuo1dH0Eipm41j2+BZWlQjiUgq5uj8+yzy+EU1ZRRyJcOKzbDACeuD
          BpWWSXGBI5G4CppeYLjMUHZpJYeX1USULJQd2c4crLJKb76E8gz3Z9kN
          -----END RSA PRIVATE KEY-----

        interfaces:
          port1:
            mac_address: "fa:16:3e:9b:89:52"
            pci_address: "0000:00:04.0"
            link: link1
          port2:
            mac_address: "fa:16:3e:7a:33:60"
            pci_address: "0000:00:05.0"
            link: link4
          port3:
            mac_address: "fa:16:3e:29:b7:ae"
            pci_address: "0000:00:06.0"
            link: link3
          port4:
            mac_address: "fa:16:3e:76:8d:ff"
            pci_address: "0000:00:07.0"
            link: link6
      DUT2:
        type: DUT
        host: "10.30.51.156"
        arch: x86_64
        port: 22
        username: cisco
        honeycomb:
          user: admin
          passwd: admin
          port: 8183
          netconf_port: 2831
        priv_key: |
          -----BEGIN RSA PRIVATE KEY-----
          MIIEpgIBAAKCAQEAwUDlTpzSHpwLQotZOFS4AgcPNEWCnP1AB2hWFmvI+8Kah/gb
          v8ruZU9RqhPs56tyKzxbhvNkY4VbH5F1GilHZu3mLqzM4KfghMmaeMEjO1T7BYYd
          vuBfTvIluljfQ2vAlnYrDwn+ClxJk81m0pDgvrLEX4qVVh2sGh7UEkYy5r82DNa2
          4VjzPB1J/c8a9zP8FoZUhYIzF4FLvRMjUADpbMXgJMsGpaZLmz95ap0Eot7vb1Cc
          1LvF97iyBCrtIOSKRKA50ZhLGjMKmOwnYU+cP5718tbproDVi6VJOo7zeuXyetMs
          8YBl9kWblWG9BqP9jctFvsmi5G7hXgq1Y8u+DwIDAQABAoIBAQC/W4E0DHjLMny7
          0bvw2YKzD0Zw3fttdB94tkm4PdZv5MybooPnsAvLaXVV0hEdfVi5kzSWNl/LY/tN
          EP1BgGphc2QgB59/PPxGwFIjDCvUzlsZpynBHe+B/qh5ExNQcVvsIOqWI7DXlXaN
          0i/khOzmJ6HncRRah1spKimYRsaUUDskyg7q3QqMWVaqBbbMvLs/w7ZWd/zoDqCU
          MY/pCI6hkB3QbRo0OdiZLohphBl2ShABTwjvVyyKL5UA4jAEneJrhH5gWVLXnfgD
          p62W5CollKEYblC8mUkPxpP7Qo277zw3xaq+oktIZhc5SUEUd7nJZtNqVAHqkItW
          79VmpKyxAoGBAPfU+kqNPaTSvp+x1n5sn2SgipzDtgi9QqNmC4cjtrQQaaqI57SG
          OHw1jX8i7L2G1WvVtkHg060nlEVo5n65ffFOqeVBezLVJ7ghWI8U+oBiJJyQ4boD
          GJVNsoOSUQ0rtuGd9eVwfDk3ol9aCN0KK53oPfIYli29pyu4l095kg11AoGBAMef
          bPEMBI/2XmCPshLSwhGFl+dW8d+Klluj3CUQ/0vUlvma3dfBOYNsIwAgTP0iIUTg
          8DYE6KBCdPtxAUEI0YAEAKB9ry1tKR2NQEIPfslYytKErtwjAiqSi0heM6+zwEzu
          f54Z4oBhsMSL0jXoOMnu+NZzEc6EUdQeY4O+jhjzAoGBAIogC3dtjMPGKTP7+93u
          UE/XIioI8fWg9fj3sMka4IMu+pVvRCRbAjRH7JrFLkjbUyuMqs3Arnk9K+gbdQt/
          +m95Njtt6WoFXuPCwgbM3GidSmZwYT4454SfDzVBYScEDCNm1FuR+8ov9bFLDtGT
          D4gsngnGJj1MDFXTxZEn4nzZAoGBAKCg4WmpUPaCuXibyB+rZavxwsTNSn2lJ83/
          sYJGBhf/raiV/FLDUcM1vYg5dZnu37RsB/5/vqxOLZGyYd7x+Jo5HkQGPnKgNwhn
          g8BkdZIRF8uEJqxOo0ycdOU7n/2O93swIpKWo5LIiRPuqqzj+uZKnAL7vuVdxfaY
          qVz2daMPAoGBALgaaKa3voU/HO1PYLWIhFrBThyJ+BQSQ8OqrEzC8AnegWFxRAM8
          EqrzZXl7ACUuo1dH0Eipm41j2+BZWlQjiUgq5uj8+yzy+EU1ZRRyJcOKzbDACeuD
          BpWWSXGBI5G4CppeYLjMUHZpJYeX1USULJQd2c4crLJKb76E8gz3Z9kN
          -----END RSA PRIVATE KEY-----

        interfaces:
          port1:
            mac_address: "fa:16:3e:ad:6c:7d"
            pci_address: "0000:00:04.0"
            link: link2
          port2:
            mac_address: "fa:16:3e:94:a4:99"
            pci_address: "0000:00:05.0"
            link: link5
          port3:
            mac_address: "fa:16:3e:75:92:da"
            pci_address: "0000:00:06.0"
            link: link3
          port4:
            mac_address: "fa:16:3e:2c:b1:2a"
            pci_address: "0000:00:07.0"
            link: link6

VPP Version
~~~~~~~~~~~

|vpp-release|

VPP Installed Packages - Ubuntu
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

::

    $ dpkg -l | grep vpp
    ii  libvppinfra                           19.08-release                              amd64        Vector Packet Processing--runtime libraries
    ii  libvppinfra-dev                       19.08-release                              amd64        Vector Packet Processing--runtime libraries
    ii  python3-vpp-api                       19.08-release                              amd64        VPP Python3 API bindings
    ii  vpp                                   19.08-release                              amd64        Vector Packet Processing--executables
    ii  vpp-api-python                        19.08-release                              amd64        VPP Python API bindings
    ii  vpp-dbg                               19.08-release                              amd64        Vector Packet Processing--debug symbols
    ii  vpp-dev                               19.08-release                              amd64        Vector Packet Processing--development support
    ii  vpp-plugin-core                       19.08-release                              amd64        Vector Packet Processing--runtime core plugins
    ii  vpp-plugin-dpdk                       19.08-release                              amd64        Vector Packet Processing--runtime dpdk plugin

VPP Installed Packages - Centos
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

::

    $ rpm -qai *vpp*
    vpp-api-python
    Version     : 19.08
    Release     : release
    Architecture: x86_64
    Install Date: Wed 28 Aug 2019 01:35:57 AM EDT
    Group       : Development/Libraries
    Size        : 195318
    License     : ASL 2.0
    Signature   : (none)
    Source RPM  : vpp-19.08-release.src.rpm
    Build Date  : Wed 21 Aug 2019 02:30:08 PM EDT
    Build Host  : 05ab23f629ba
    Relocations : (not relocatable)
    Summary     : VPP api python bindings
    Description :
    This package contains the python bindings for the vpp api
    Name        : vpp
    Version     : 19.08
    Release     : release
    Architecture: x86_64
    Install Date: Wed 28 Aug 2019 01:35:57 AM EDT
    Group       : Unspecified
    Size        : 2681317
    License     : ASL 2.0
    Signature   : (none)
    Source RPM  : vpp-19.08-release.src.rpm
    Build Date  : Wed 21 Aug 2019 02:30:08 PM EDT
    Build Host  : 05ab23f629ba
    Relocations : (not relocatable)
    Summary     : Vector Packet Processing
    Description :
    This package provides VPP executables: vpp, vpp_api_test, vpp_json_test
    vpp - the vector packet engine
    vpp_api_test - vector packet engine API test tool
    vpp_json_test - vector packet engine JSON test tool
    Name        : vpp-lib
    Version     : 19.08
    Release     : release
    Architecture: x86_64
    Install Date: Wed 28 Aug 2019 01:35:57 AM EDT
    Group       : System Environment/Libraries
    Size        : 43222411
    License     : ASL 2.0
    Signature   : (none)
    Source RPM  : vpp-19.08-release.src.rpm
    Build Date  : Wed 21 Aug 2019 02:30:08 PM EDT
    Build Host  : 05ab23f629ba
    Relocations : (not relocatable)
    Summary     : VPP libraries
    Description :
    This package contains the VPP shared libraries, including:
    vppinfra - foundation library supporting vectors, hashes, bitmaps, pools, and string formatting.
    svm - vm library
    vlib - vector processing library
    vlib-api - binary API library
    vnet -  network stack library
    Name        : vpp-devel
    Version     : 19.08
    Release     : release
    Architecture: x86_64
    Install Date: Wed 28 Aug 2019 01:35:59 AM EDT
    Group       : Development/Libraries
    Size        : 13906969
    License     : ASL 2.0
    Signature   : (none)
    Source RPM  : vpp-19.08-release.src.rpm
    Build Date  : Wed 21 Aug 2019 02:30:08 PM EDT
    Build Host  : 05ab23f629ba
    Relocations : (not relocatable)
    Summary     : VPP header files, static libraries
    Description :
    This package contains the header files for VPP.
    Install this package if you want to write a
    program for compilation and linking with vpp lib.
    vlib
    vlibmemory
    vnet - devices, classify, dhcp, ethernet flow, gre, ip, etc.
    vpp-api
    vppinfra
    Name        : vpp-selinux-policy
    Version     : 19.08
    Release     : release
    Architecture: x86_64
    Install Date: Wed 28 Aug 2019 01:35:56 AM EDT
    Group       : System Environment/Base
    Size        : 102929
    License     : ASL 2.0
    Signature   : (none)
    Source RPM  : vpp-19.08-release.src.rpm
    Build Date  : Wed 21 Aug 2019 02:30:08 PM EDT
    Build Host  : 05ab23f629ba
    Relocations : (not relocatable)
    Summary     : VPP Security-Enhanced Linux (SELinux) policy
    Description :
    This package contains a tailored VPP SELinux policy
    Name        : vpp-plugins
    Version     : 19.08
    Release     : release
    Architecture: x86_64
    Install Date: Wed 28 Aug 2019 01:35:59 AM EDT
    Group       : System Environment/Libraries
    Size        : 34150451
    License     : ASL 2.0
    Signature   : (none)
    Source RPM  : vpp-19.08-release.src.rpm
    Build Date  : Wed 21 Aug 2019 02:30:08 PM EDT
    Build Host  : 05ab23f629ba
    Relocations : (not relocatable)
    Summary     : Vector Packet Processing--runtime plugins
    Description :
    This package contains VPP plugins

VPP Startup Configuration
~~~~~~~~~~~~~~~~~~~~~~~~~

VPP startup configuration is common for all test cases.

**Common Configuration**

There is used the default startup configuration as defined in `VPP startup.conf`_

TG Settings - Scapy
-------------------

Traffic Generator node is VM running the same OS Linux as SUTs. Ports of this
VM are used as source (Tx) and destination (Rx) ports for the traffic.

Traffic scripts of test cases are executed on this VM.

TG VM Configuration
~~~~~~~~~~~~~~~~~~~

Configuration of the TG VMs is defined in `VIRL topologies directory`_.

   /csit/resources/tools/virl/topologies/double-ring-nested.xenial.virl

- List of TG VM interfaces:::

    <interface id="0" name="eth1"/>
    <interface id="1" name="eth2"/>
    <interface id="2" name="eth3"/>
    <interface id="3" name="eth4"/>
    <interface id="4" name="eth5"/>
    <interface id="5" name="eth6"/>

TG Port Configuration
~~~~~~~~~~~~~~~~~~~~~

Port configuration of TG is defined in topology file that is generated per VIRL
simulation based on the definition stored in `VIRL topologies directory`_.

Example of TG node configuration:::

    TG:
        type: TG
        host: "10.30.51.155"
        arch: x86_64
        port: 22
        username: cisco
        priv_key: |
          -----BEGIN RSA PRIVATE KEY-----
          MIIEpgIBAAKCAQEAwUDlTpzSHpwLQotZOFS4AgcPNEWCnP1AB2hWFmvI+8Kah/gb
          v8ruZU9RqhPs56tyKzxbhvNkY4VbH5F1GilHZu3mLqzM4KfghMmaeMEjO1T7BYYd
          vuBfTvIluljfQ2vAlnYrDwn+ClxJk81m0pDgvrLEX4qVVh2sGh7UEkYy5r82DNa2
          4VjzPB1J/c8a9zP8FoZUhYIzF4FLvRMjUADpbMXgJMsGpaZLmz95ap0Eot7vb1Cc
          1LvF97iyBCrtIOSKRKA50ZhLGjMKmOwnYU+cP5718tbproDVi6VJOo7zeuXyetMs
          8YBl9kWblWG9BqP9jctFvsmi5G7hXgq1Y8u+DwIDAQABAoIBAQC/W4E0DHjLMny7
          0bvw2YKzD0Zw3fttdB94tkm4PdZv5MybooPnsAvLaXVV0hEdfVi5kzSWNl/LY/tN
          EP1BgGphc2QgB59/PPxGwFIjDCvUzlsZpynBHe+B/qh5ExNQcVvsIOqWI7DXlXaN
          0i/khOzmJ6HncRRah1spKimYRsaUUDskyg7q3QqMWVaqBbbMvLs/w7ZWd/zoDqCU
          MY/pCI6hkB3QbRo0OdiZLohphBl2ShABTwjvVyyKL5UA4jAEneJrhH5gWVLXnfgD
          p62W5CollKEYblC8mUkPxpP7Qo277zw3xaq+oktIZhc5SUEUd7nJZtNqVAHqkItW
          79VmpKyxAoGBAPfU+kqNPaTSvp+x1n5sn2SgipzDtgi9QqNmC4cjtrQQaaqI57SG
          OHw1jX8i7L2G1WvVtkHg060nlEVo5n65ffFOqeVBezLVJ7ghWI8U+oBiJJyQ4boD
          GJVNsoOSUQ0rtuGd9eVwfDk3ol9aCN0KK53oPfIYli29pyu4l095kg11AoGBAMef
          bPEMBI/2XmCPshLSwhGFl+dW8d+Klluj3CUQ/0vUlvma3dfBOYNsIwAgTP0iIUTg
          8DYE6KBCdPtxAUEI0YAEAKB9ry1tKR2NQEIPfslYytKErtwjAiqSi0heM6+zwEzu
          f54Z4oBhsMSL0jXoOMnu+NZzEc6EUdQeY4O+jhjzAoGBAIogC3dtjMPGKTP7+93u
          UE/XIioI8fWg9fj3sMka4IMu+pVvRCRbAjRH7JrFLkjbUyuMqs3Arnk9K+gbdQt/
          +m95Njtt6WoFXuPCwgbM3GidSmZwYT4454SfDzVBYScEDCNm1FuR+8ov9bFLDtGT
          D4gsngnGJj1MDFXTxZEn4nzZAoGBAKCg4WmpUPaCuXibyB+rZavxwsTNSn2lJ83/
          sYJGBhf/raiV/FLDUcM1vYg5dZnu37RsB/5/vqxOLZGyYd7x+Jo5HkQGPnKgNwhn
          g8BkdZIRF8uEJqxOo0ycdOU7n/2O93swIpKWo5LIiRPuqqzj+uZKnAL7vuVdxfaY
          qVz2daMPAoGBALgaaKa3voU/HO1PYLWIhFrBThyJ+BQSQ8OqrEzC8AnegWFxRAM8
          EqrzZXl7ACUuo1dH0Eipm41j2+BZWlQjiUgq5uj8+yzy+EU1ZRRyJcOKzbDACeuD
          BpWWSXGBI5G4CppeYLjMUHZpJYeX1USULJQd2c4crLJKb76E8gz3Z9kN
          -----END RSA PRIVATE KEY-----

        interfaces:
          port3:
            mac_address: "fa:16:3e:b9:e1:27"
            pci_address: "0000:00:06.0"
            link: link1
            driver: virtio-pci
          port4:
            mac_address: "fa:16:3e:e9:c8:68"
            pci_address: "0000:00:07.0"
            link: link4
            driver: virtio-pci
          port5:
            mac_address: "fa:16:3e:e8:d3:47"
            pci_address: "0000:00:08.0"
            link: link2
            driver: virtio-pci
          port6:
            mac_address: "fa:16:3e:cf:ca:58"
            pci_address: "0000:00:09.0"
            link: link5
            driver: virtio-pci

Traffic Generator
~~~~~~~~~~~~~~~~~

Functional tests utilize Scapy as a traffic generator. Scapy v2.3.1 is
used for |vpp-release| tests.