mirror of
https://github.com/vyos/vyos-documentation.git
synced 2025-10-26 08:41:46 +01:00
91 lines
3.0 KiB
ReStructuredText
91 lines
3.0 KiB
ReStructuredText
.. _dummy-interface:
|
|
|
|
#####
|
|
Dummy
|
|
#####
|
|
|
|
The dummy interface is really a little exotic, but rather useful nevertheless.
|
|
Dummy interfaces are much like the :ref:`loopback-interface` interface, except
|
|
you can have as many as you want.
|
|
|
|
.. note:: Dummy interfaces can be used as interfaces that always stay up (in
|
|
the same fashion to loopbacks in Cisco IOS), or for testing purposes.
|
|
|
|
.. hint:: A Dummy 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:`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
|
|
#############
|
|
|
|
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
|
|
|
|
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
|
|
|
|
|