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.. _dummy-interface:
#####
Dummy
#####
The dummy interface is really a little exotic, but rather useful nevertheless.
Dummy interfaces are much like the loopback interface, except you can have
as many as you want. Dummy interfaces can be used as interfaces that always
stay up (in the same fashion to loopbacks in Cisco IOS), or for testing
purposes.
Configuration
#############
Address
-------
.. cfgcmd:: set interfaces dummy <interface> address <address | dhcp | dhcpv6>
Configure dummy interface `<interface>` with one or more interface
addresses.
* **address** can be specified multiple times as IPv4 and/or IPv6 address,
e.g. 192.0.2.1/24 and/or 2001:db8::1/64
* **dhcp** interface address is received by DHCP from a DHCP server on this
segment.
* **dhcpv6** interface address is received by DHCPv6 from a DHCPv6 server on
this segment.
Example:
.. code-block:: none
set interfaces dummy dum10 address 192.0.2.1/24
set interfaces dummy dum10 address 192.0.2.2/24
set interfaces dummy dum10 address 2001:db8::ffff/64
set interfaces dummy dum10 address 2001:db8:100::ffff/64
Link Administration
-------------------
.. cfgcmd:: set interfaces dummy <interface> description <description>
Assign given `<description>` to interface. Description will also be passed
to SNMP monitoring systems.
.. cfgcmd:: set interfaces dummy <interface> disable
Disable given `<interface>`. It will be placed in administratively down
state.
Operation
=========
.. opcmd:: show interfaces dummy
Show brief interface information.information
.. code-block:: none
vyos@vyos:~$ show interfaces dummy
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address S/L Description
--------- ---------- --- -----------
dum0 172.18.254.201/32 u/u
.. opcmd:: show interfaces dummy <interface>
Show detailed information on given `<interface>`
.. code-block:: none
vyos@vyos:~$ show interfaces ethernet eth0
dum0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
link/ether 26:7c:8e:bc:fc:f5 brd ff:ff:ff:ff:ff:ff
inet 172.18.254.201/32 scope global dum0
valid_lft forever preferred_lft forever
inet6 fe80::247c:8eff:febc:fcf5/64 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
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