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.. _trex:
Using VPP with TRex
===================
In this example we use only two systems, *csp2s22c03* and *net2s22c05*, to run
**TRex** VPP is installed on **csp2s22c03** and run as a packet forwarding
engine. On *net2s22c05*, TRex is used to generate both client and server-side
traffic. **TRex** is a high-performance traffic generator. It leverages DPDK and
run in user space. Figure 2 illustrates this configuration.
VPP is set up on *csp2s22c03* exactly as it was in the previous example. Only
the setup on *net2s22c05* is modified slightly to run TRex preconfigured traffic
files.
.. figure:: /_images/trex.png
Figure 2: The TRex traffic generator sends packages to the host that has VPP running.
First we install **TRex**.
.. code-block:: console
NET2S22C05$ wget --no-cache http://trex-tgn.cisco.com/trex/release/latest
NET2S22C05$ tar -xzvf latest
NET2S22C05$ cd v2.37
Then show the devices we have.
.. code-block:: console
NET2S22C05$ sudo ./dpdk_nic_bind.py -s
Network devices using DPDK-compatible driver
============================================
0000:87:00.0 'Ethernet Controller XL710 for 40GbE QSFP+' drv=vfio-pci unused=i40e
0000:87:00.1 'Ethernet Controller XL710 for 40GbE QSFP+' drv=vfio-pci unused=i40e
Network devices using kernel driver
===================================
0000:03:00.0 'Ethernet Controller 10-Gigabit X540-AT2' if=enp3s0f0 drv=ixgbe unused=vfio-pci *Active*
0000:03:00.1 'Ethernet Controller 10-Gigabit X540-AT2' if=enp3s0f1 drv=ixgbe unused=vfio-pci
0000:81:00.0 '82599 10 Gigabit TN Network Connection' if=ens787f0 drv=ixgbe unused=vfio-pci
0000:81:00.1 '82599 10 Gigabit TN Network Connection' if=ens787f1 drv=ixgbe unused=vfio-pci
Other network devices
=====================
<none>
Create the */etc/trex_cfg.yaml* configuration file. In this configuration file,
the port should match the interfaces available in the target system, which is
*net2s22c05* in our example. The IP addresses correspond to Figure 2. For more
information on the configuration file, please refer to the `TRex Manual <http://trex-tgn.cisco.com/trex/doc/index.html>`_.
.. code-block:: console
NET2S22C05$ cat /etc/trex_cfg.yaml
- port_limit: 2
version: 2
interfaces: ['87:00.0', '87:00.1']
port_bandwidth_gb: 40
port_info:
- ip: 10.10.2.2
default_gw: 10.10.2.1
- ip: 10.10.1.2
default_gw: 10.10.1.1
Stop the previous VPP session and start it again in order to add a route for new
IP addresses 16.0.0.0/8 and 48.0.0.0/8, according to Figure 2. Those IP addresses
are needed because TRex generates packets that use these addresses. Refer to the
`TRex Manual <http://trex-tgn.cisco.com/trex/doc/index.html>`_ for details on
these traffic templates.
.. code-block:: console
csp2s22c03$ sudo service vpp stop
csp2s22c03$ sudo service vpp start
csp2s22c03$ sudo vppctl
_______ _ _ _____ ___
__/ __/ _ \ (_)__ | | / / _ \/ _ \
_/ _// // / / / _ \ | |/ / ___/ ___/
/_/ /____(_)_/\___/ |___/_/ /_/
vpp# sho int
Name Idx State Counter Count
FortyGigabitEthernet82/0/0 1 down
FortyGigabitEthernet82/0/1 2 down
local0 0 down
vpp#
vpp# set interface ip address FortyGigabitEthernet82/0/0 10.10.1.1/24
vpp# set interface ip address FortyGigabitEthernet82/0/1 10.10.2.1/24
vpp# set interface state FortyGigabitEthernet82/0/0 up
vpp# set interface state FortyGigabitEthernet82/0/1 up
vpp# ip route add 16.0.0.0/8 via 10.10.1.2
vpp# ip route add 48.0.0.0/8 via 10.10.2.2
vpp# clear run
Now, you can generate a simple traffic flow from *net2s22c05* using the traffic
configuration file "cap2/dns.yaml".
.. code-block:: console
NET2S22C05$ sudo ./t-rex-64 -f cap2/dns.yaml -d 1 -l 1000
summary stats
--------------
Total-pkt-drop : 0 pkts
Total-tx-bytes : 166886 bytes
Total-tx-sw-bytes : 166716 bytes
Total-rx-bytes : 166886 byte
Total-tx-pkt : 2528 pkts
Total-rx-pkt : 2528 pkts
Total-sw-tx-pkt : 2526 pkts
Total-sw-err : 0 pkts
Total ARP sent : 4 pkts
Total ARP received : 2 pkts
maximum-latency : 35 usec
average-latency : 8 usec
latency-any-error : OK
On *csp2s22c03*, the *show run* command displays the graph runtime statistics.
.. figure:: /_images/build-a-fast-network-stack-terminal-2.png
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