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:lastproofread: 2023-01-20
.. _loopback-interface:
########
Loopback
########
The loopback networking interface is a virtual network device implemented
entirely in software. All traffic sent to it "loops back" and just targets
services on your local machine.
.. note:: There can only be one loopback ``lo`` interface on the system. If
you need multiple interfaces, please use the :ref:`dummy-interface`
interface type.
.. hint:: A lookback interface is always up, thus it could be used for
management traffic or as source/destination for and :abbr:`IGP (Interior
Gateway Protocol)` like :ref:`routing-bgp` so your internal BGP link is not
dependent on physical link states and multiple routes can be chosen to the
destination. A :ref:`dummy-interface` Interface should always be preferred
over a :ref:`loopback-interface` interface.
*************
Configuration
*************
Common interface configuration
==============================
.. cmdinclude:: /_include/interface-address.txt
:var0: loopback
:var1: lo
.. cmdinclude:: /_include/interface-description.txt
:var0: loopback
:var1: lo
*********
Operation
*********
.. opcmd:: show interfaces loopback
Show brief interface information.
.. code-block:: none
vyos@vyos:~$ show interfaces loopback
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address S/L Description
--------- ---------- --- -----------
lo 127.0.0.1/8 u/u
::1/128
.. opcmd:: show interfaces loopback lo
Show detailed information on the given loopback interface `lo`.
.. code-block:: none
vyos@vyos:~$ show interfaces loopback lo
lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
RX: bytes packets errors dropped overrun mcast
300 6 0 0 0 0
TX: bytes packets errors dropped carrier collisions
300 6 0 0 0 0
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