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NAME | SYNOPSIS | DESCRIPTION | CAVEATS | EXAMPLES | SEE ALSO | AUTHOR | COLOPHON |
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IP-VRF(8) Linux IP-VRF(8)
ip-vrf - run a command against a vrf
ip vrf { COMMAND | help }
ip vrf show [ NAME ]
ip vrf identify [ PID ]
ip vrf pids NAME
ip vrf exec [ NAME ] command...
A VRF provides traffic isolation at layer 3 for routing, similar
to how a VLAN is used to isolate traffic at layer 2.
Fundamentally, a VRF is a separate routing table. Network devices
are associated with a VRF by enslaving the device to the VRF. At
that point network addresses assigned to the device are local to
the VRF with host and connected routes moved to the table
associated with the VRF.
A process can specify a VRF using several APIs -- binding the
socket to the VRF device using SO_BINDTODEVICE, setting the VRF
association using IP_UNICAST_IF or IPV6_UNICAST_IF, or specifying
the VRF for a specific message using IP_PKTINFO or IPV6_PKTINFO.
By default a process is not bound to any VRF. An association can
be set explicitly by making the program use one of the APIs
mentioned above or implicitly using a helper to set
SO_BINDTODEVICE for all IPv4 and IPv6 sockets (AF_INET and
AF_INET6) when the socket is created. This ip-vrf command is a
helper to run a command against a specific VRF with the VRF
association inherited parent to child.
ip vrf show [ NAME ] - Show all configured VRF
This command lists all VRF and their corresponding table
ids. If NAME is given, then only that VRF and table id is
shown. The latter command is useful for scripting where
the table id for a VRF is needed.
ip vrf exec [ NAME ] cmd ... - Run cmd against the named VRF
This command allows applications that are VRF unaware to
be run against a VRF other than the default VRF (main
table). A command can be run against the default VRF by
passing the "default" as the VRF name. This is useful if
the current shell is associated with another VRF (e.g,
Management VRF).
This command requires the system to be booted with cgroup
v2 (e.g. with systemd, add
systemd.unified_cgroup_hierarchy=1 to the kernel command
line).
This command also requires to be run as root.
Alternatively it can be run by an unprivileged user if the
following capabilities(7) are given:
CAP_BPF
To load the BPF program.
CAP_NET_ADMIN
To set the socket into the cgroup.
CAP_DAC_OVERRIDE
To create the cgroup subdir in /sys.
If these capabilities are added and if ip(8) is built with
libcap(3) then these capabilities will be dropped before
cmd is executed by ip vrf exec. For every other
unprivileged invocation of ip(8) all capabilities will be
dropped.
NOTE: capabilities will NOT be dropped if CAP_NET_ADMIN is
set to INHERITABLE to avoid breaking programs with ambient
capabilities that call ip.
ip vrf identify [PID] - Report VRF association for process
This command shows the VRF association of the specified
process. If PID is not specified then the id of the
current process is used.
ip vrf pids NAME - Report processes associated with the named VRF
This command shows all process ids that are associated
with the given VRF.
This command requires a kernel compiled with CGROUPS and
CGROUP_BPF enabled.
The VRF helper *only* affects network layer sockets.
ip vrf exec red ssh 10.100.1.254
Executes ssh to 10.100.1.254 against the VRF red table.
ip(8), ip-link(8), ip-address(8), ip-route(8), ip-neighbor(8)
Original Manpage by David Ahern
This page is part of the iproute2 (utilities for controlling
TCP/IP networking and traffic) project. Information about the
project can be found at
⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
If you have a bug report for this manual page, send it to
[email protected], [email protected]. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-06-11.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to [email protected]
iproute2 7 Dec 2016 IP-VRF(8)
Pages that refer to this page: ip(8)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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