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:lastproofread:2021-07-07
.. _vrf:
###
VRF
###
:abbr:`VRF (Virtual Routing and Forwarding)` devices combined with ip rules
provides the ability to create virtual routing and forwarding domains (aka
VRFs, VRF-lite to be specific) in the Linux network stack. One use case is the
multi-tenancy problem where each tenant has their own unique routing tables and
in the very least need different default gateways.
Configuration
=============
A VRF device is created with an associated route table. Network interfaces are
then enslaved to a VRF device.
.. cfgcmd:: set vrf name <name>
Create new VRF instance with `<name>`. The name is used when placing
individual interfaces into the VRF.
.. cfgcmd:: set vrf name <name> table <id>
Configured routing table `<id>` is used by VRF `<name>`.
.. note:: A routing table ID can not be modified once it is assigned. It can
only be changed by deleting and re-adding the VRF instance.
.. cfgcmd:: set vrf bind-to-all
By default the scope of the port bindings for unbound sockets is limited to
the default VRF. That is, it will not be matched by packets arriving on
interfaces enslaved to a VRF and processes may bind to the same port if
they bind to a VRF.
TCP & UDP services running in the default VRF context (ie., not bound to any
VRF device) can work across all VRF domains by enabling this option.
Interfaces
----------
When VRFs are used it is not only mandatory to create a VRF but also the VRF
itself needs to be assigned to an interface.
.. cfgcmd:: set interfaces <dummy | ethernet | bonding | bridge | pppoe>
<interface> vrf <name>
Assign interface identified by `<interface>` to VRF named `<name>`.
Routing
-------
.. note:: VyOS 1.4 (sagitta) introduced dynamic routing support for VRFs.
Currently dynamic routing is supported for the following protocols:
- :ref:`routing-bgp`
- :ref:`routing-isis`
- :ref:`routing-ospf`
- :ref:`routing-static`
The CLI configuration is same as mentioned in above articles. The only
difference is, that each routing protocol used, must be prefixed with the `vrf
name <name>` command.
Example
^^^^^^^
The following commands would be required to set options for a given dynamic
routing protocol inside a given vrf:
- :ref:`routing-bgp`: ``set vrf name <name> protocols bgp ...``
- :ref:`routing-isis`: ``set vrf name <name> protocols isis ...``
- :ref:`routing-ospf`: ``set vrf name <name> protocols ospf ...``
- :ref:`routing-static`: ``set vrf name <name> protocols static ...``
Operation
=========
It is not sufficient to only configure a VRF but VRFs must be maintained, too.
For VRF maintenance the following operational commands are in place.
.. opcmd:: show vrf
Lists VRFs that have been created
.. code-block:: none
vyos@vyos:~$ show vrf
VRF name state mac address flags interfaces
-------- ----- ----------- ----- ----------
blue up 00:53:12:d8:74:24 noarp,master,up,lower_up dum200,eth0.302
red up 00:53:de:02:df:aa noarp,master,up,lower_up dum100,eth0.300,bond0.100,peth0
.. note:: Command should probably be extended to list also the real
interfaces assigned to this one VRF to get a better overview.
.. opcmd:: show vrf <name>
.. code-block:: none
vyos@vyos:~$ show vrf name blue
VRF name state mac address flags interfaces
-------- ----- ----------- ----- ----------
blue up 00:53:12:d8:74:24 noarp,master,up,lower_up dum200,eth0.302
.. opcmd:: show ip route vrf <name>
Display IPv4 routing table for VRF identified by `<name>`.
.. code-block:: none
vyos@vyos:~$ show ip route vrf blue
Codes: K - kernel route, C - connected, S - static, R - RIP,
O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
F - PBR, f - OpenFabric,
> - selected route, * - FIB route, q - queued route, r - rejected route
VRF blue:
K 0.0.0.0/0 [255/8192] unreachable (ICMP unreachable), 00:00:50
S>* 172.16.0.0/16 [1/0] via 192.0.2.1, dum1, 00:00:02
C>* 192.0.2.0/24 is directly connected, dum1, 00:00:06
.. opcmd:: show ipv6 route vrf <name>
Display IPv6 routing table for VRF identified by `<name>`.
.. code-block:: none
vyos@vyos:~$ show ipv6 route vrf red
Codes: K - kernel route, C - connected, S - static, R - RIPng,
O - OSPFv3, I - IS-IS, B - BGP, N - NHRP, T - Table,
v - VNC, V - VNC-Direct, A - Babel, D - SHARP, F - PBR,
f - OpenFabric,
> - selected route, * - FIB route, q - queued route, r - rejected route
VRF red:
K ::/0 [255/8192] unreachable (ICMP unreachable), 00:43:20
C>* 2001:db8::/64 is directly connected, dum1, 00:02:19
C>* fe80::/64 is directly connected, dum1, 00:43:19
K>* ff00::/8 [0/256] is directly connected, dum1, 00:43:19
.. opcmd:: ping <host> vrf <name>
The ping command is used to test whether a network host is reachable or not.
Ping uses ICMP protocol's mandatory ECHO_REQUEST datagram to elicit an
ICMP ECHO_RESPONSE from a host or gateway. ECHO_REQUEST datagrams (pings)
will have an IP and ICMP header, followed by "struct timeval" and an
arbitrary number of pad bytes used to fill out the packet.
When doing fault isolation with ping, you should first run it on the local
host, to verify that the local network interface is up and running. Then,
continue with hosts and gateways further down the road towards your
destination. Round-trip time and packet loss statistics are computed.
Duplicate packets are not included in the packet loss calculation, although
the round-trip time of these packets is used in calculating the minimum/
average/maximum round-trip time numbers.
Ping command can be interrupted at any given time using `<Ctrl>+c`- A brief
statistic is shown afterwards.
.. code-block:: none
vyos@vyos:~$ ping 192.0.2.1 vrf red
PING 192.0.2.1 (192.0.2.1) 56(84) bytes of data.
64 bytes from 192.0.2.1: icmp_seq=1 ttl=64 time=0.070 ms
64 bytes from 192.0.2.1: icmp_seq=2 ttl=64 time=0.078 ms
^C
--- 192.0.2.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 4ms
rtt min/avg/max/mdev = 0.070/0.074/0.078/0.004 ms
.. opcmd:: traceroute vrf <name> [ipv4 | ipv6] <host>
Displays the route packets taken to a network host utilizing VRF instance
identified by `<name>`. When using the IPv4 or IPv6 option, displays the
route packets taken to the given hosts IP address family. This option is
useful when the host is specified as a hostname rather than an IP address.
.. include:: /_include/common-references.txt
|
