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:lastproofread: 2022-11-25
.. _virtual-ethernet:
################
Virtual Ethernet
################
The veth devices are virtual Ethernet devices. They can act as tunnels between
network namespaces to create a bridge to a physical network device in another
namespace or VRF, but can also be used as standalone network devices.
.. note:: veth interfaces need to be created in pairs - it's called the peer name
*************
Configuration
*************
Common interface configuration
==============================
.. cmdinclude:: /_include/interface-address-with-dhcp.txt
:var0: virtual-ethernet
:var1: veth0
.. cmdinclude:: /_include/interface-description.txt
:var0: virtual-ethernet
:var1: veth0
VLAN
====
Regular VLANs (802.1q)
----------------------
.. cmdinclude:: /_include/interface-vlan-8021q.txt
:var0: virtual-ethernet
:var1: veth0
QinQ (802.1ad)
--------------
.. cmdinclude:: /_include/interface-vlan-8021ad.txt
:var0: virtual-ethernet
:var1: veth0
.. cmdinclude:: /_include/interface-disable.txt
:var0: virtual-ethernet
:var1: veth0
.. cmdinclude:: /_include/interface-vrf.txt
:var0: virtual-ethernet
:var1: veth0
*********
Operation
*********
.. opcmd:: show interfaces virtual-ethernet
Show brief interface information.
.. code-block:: none
vyos@vyos:~$ show interfaces virtual-ethernet
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address S/L Description
--------- ---------- --- -----------
veth10 100.64.0.0/31 u/u
veth11 100.64.0.1/31 u/u
.. opcmd:: show interfaces virtual-ethernet <interface>
Show detailed information on given `<interface>`
.. code-block:: none
vyos@vyos:~$ show interfaces virtual-ethernet veth11
10: veth11@veth10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master red state UP group default qlen 1000
link/ether b2:7b:df:47:e9:11 brd ff:ff:ff:ff:ff:ff
inet 100.64.0.1/31 scope global veth11
valid_lft forever preferred_lft forever
inet6 fe80::b07b:dfff:fe47:e911/64 scope link
valid_lft forever preferred_lft forever
RX: bytes packets errors dropped overrun mcast
0 0 0 0 0 0
TX: bytes packets errors dropped carrier collisions
1369707 4267 0 0 0 0
*******
Example
*******
Interconnect the global VRF with vrf "red" using the veth10 <-> veth 11 pair
.. code-block:: none
set interfaces virtual-ethernet veth10 address '100.64.0.0/31'
set interfaces virtual-ethernet veth10 peer-name 'veth11'
set interfaces virtual-ethernet veth11 address '100.64.0.1/31'
set interfaces virtual-ethernet veth11 peer-name 'veth10'
set interfaces virtual-ethernet veth11 vrf 'red'
set vrf name red table '1000'
vyos@vyos:~$ ping 100.64.0.1
PING 100.64.0.1 (100.64.0.1) 56(84) bytes of data.
64 bytes from 100.64.0.1: icmp_seq=1 ttl=64 time=0.080 ms
64 bytes from 100.64.0.1: icmp_seq=2 ttl=64 time=0.119 ms
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