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.. _interface:
.. toctree::
Creating an Interface
======================
Skills to be Learned
--------------------
#. Create a veth interface in Linux host
#. Assign an IP address to one end of the veth interface in the Linux host
#. Create a vpp host-interface that connected to one end of a veth interface via AF_PACKET
#. Add an ip address to a vpp interface
VPP commands learned in this exercise
--------------------------------------
#. `create host-interface <https://docs.fd.io/vpp/17.04/clicmd_src_vnet_devices_af_packet.html#clicmd_create_host-interface>`_
#. `set int state <https://docs.fd.io/vpp/17.04/clicmd_src_vnet.html#clicmd_set_interface_state>`_
#. `set int ip address <https://docs.fd.io/vpp/17.04/clicmd_src_vnet_ip.html#clicmd_set_interface_ip_address>`_
#. `show hardware <https://docs.fd.io/vpp/17.04/clicmd_src_vnet.html#clicmd_show_hardware-interfaces>`_
#. `show int <https://docs.fd.io/vpp/17.04/clicmd_src_vnet.html#clicmd_show_interfaces>`_
#. `show int addr <https://docs.fd.io/vpp/17.04/clicmd_src_vnet.html#clicmd_show_interfaces>`_
#. `trace add <https://docs.fd.io/vpp/17.04/clicmd_src_vlib.html#clicmd_trace_add>`_
#. `clear trace <https://docs.fd.io/vpp/17.04/clicmd_src_vlib.html#clicmd_clear_trace>`_
#. `ping <https://docs.fd.io/vpp/17.04/clicmd_src_vnet_ip.html#clicmd_ping>`_
#. `show ip arp <https://docs.fd.io/vpp/17.04/clicmd_src_vnet_ethernet.html#clicmd_show_ip_arp>`_
#. `show ip fib <https://docs.fd.io/vpp/17.04/clicmd_src_vnet_fib.html#clicmd_show_ip_fib>`_
Topology
---------
.. figure:: /_images/Create_Interface_Topology.jpg
:alt: Figure: Create Interface Topology
Figure: Create Interface Topology
Initial State
--------------
The initial state here is presumed to be the final state from the previous sections
of the tutorial.
Create veth interfaces on host
-------------------------------
In Linux, there is a type of interface call 'veth'. Think of a 'veth'
interface as being an interface that has two ends to it (rather than
one).
Create a veth interface with one end named **vpp1out** and the other
named **vpp1host**
.. code-block:: console
$ sudo ip link add name vpp1out type veth peer name vpp1host
Turn up both ends:
.. code-block:: console
$ sudo ip link set dev vpp1out up
$ sudo ip link set dev vpp1host up
Assign an IP address
---------------------
.. code-block:: console
$ sudo ip addr add 10.10.1.1/24 dev vpp1host
Display the result:
.. code-block:: console
$ ip addr show vpp1host
5: vpp1host@vpp1out: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether e2:0f:1e:59:ec:f7 brd ff:ff:ff:ff:ff:ff
inet 10.10.1.1/24 scope global vpp1host
valid_lft forever preferred_lft forever
inet6 fe80::e00f:1eff:fe59:ecf7/64 scope link
valid_lft forever preferred_lft forever
Create vpp host-interface
--------------------------
Make sure VPP is running, if not start it.
.. code-block:: console
$ ps -eaf | grep vpp
vagrant 2141 903 0 05:28 pts/0 00:00:00 grep --color=auto vpp
# vpp is not running, so start it
$ sudo /usr/bin/vpp -c startup1.conf
These commands are run from the vpp shell. Enter the VPP shell with the following
command:
.. code-block:: console
$ sudo vppctl -s /run/vpp/cli-vpp1.sock
_______ _ _ _____ ___
__/ __/ _ \ (_)__ | | / / _ \/ _ \
_/ _// // / / / _ \ | |/ / ___/ ___/
/_/ /____(_)_/\___/ |___/_/ /_/
vpp#
Create a host interface attached to **vpp1out**.
.. code-block:: console
vpp# create host-interface name vpp1out
host-vpp1out
Confirm the interface:
.. code-block:: console
vpp# show hardware
Name Idx Link Hardware
host-vpp1out 1 up host-vpp1out
Ethernet address 02:fe:d9:75:d5:b4
Linux PACKET socket interface
local0 0 down local0
local
Turn up the interface:
.. code-block:: console
vpp# set int state host-vpp1out up
Confirm the interface is up:
.. code-block:: console
vpp# show int
Name Idx State MTU (L3/IP4/IP6/MPLS) Counter Count
host-vpp1out 1 up 9000/0/0/0
local0 0 down 0/0/0/0
Assign ip address 10.10.1.2/24
.. code-block:: console
vpp# set int ip address host-vpp1out 10.10.1.2/24
Confirm the ip address is assigned:
.. code-block:: console
vpp# show int addr
host-vpp1out (up):
L3 10.10.1.2/24
local0 (dn):
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