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.. _interface:
.. toctree::
Create Interfaces Commands
===========================
This section contains those interface commands that are associated to creating an interface:
* `Create Host-Interface`_
* `Create Interface Memif`_
* `Create Loopback Interface`_
* `Create Sub-Interfaces`_
.. note:: For a complete list of CLI Debug commands refer to the Debug CLI section of the `Source Code Documents <https://docs.fd.io/vpp/18.07/clicmd.html>`_ .
Create Host-Interface
++++++++++++++++++++++
Summary/Usage
-------------
create host-interface name <*ifname*> [*hw-addr <*mac-addr*>]
Description
------------
Create a host interface that will attach to a linux AF_PACKET interface, one side of a veth pair.
The veth pair must already exist. Once created, a new host interface will exist in VPP with the name
'host-<*ifname*>', where '<*ifname*>' is the name of the specified veth pair.
Use the `show interface` command to display host interface details.
This command has the following optional parameters:
hw-addr <*mac-addr*> - Optional ethernet address, can be in either X:X:X:X:X:X unix or X.X.X cisco format
Example Usage
-------------
Example of how to create a host interface tied to one side of an existing linux veth pair named vpp1:
.. code-block:: console
vpp# create host-interface name vpp1
host-vpp1
Once the host interface is created, enable the interface using:
.. code-block:: console
vpp# set interface state host-vpp1 up
Declaration and Implementation
-------------------------------
**Declaration:** af_packet_create_command (src/vnet/devices/af_packet/cli.c line 133)
**Implementation:** af_packet_create_command_fn
Create Interface Memif
+++++++++++++++++++++++
Summary/Usage
-------------
create interface memif [id <*id*>] [socket-id <*socket-id*>] [ring-size <*size*>] [buffer-size <*size*>] [hw-addr <*mac-address*>] <master|slave> [rx-queues <*number*>] [tx-queues <*number*>] [mode ip] [secret <*string*>]
Declaration and Implementation
-------------------------------
**Declaration:** memif_create_command (src/plugins/memif/cli.c line 258)
**Implementation:** memif_create_command_fn
Create Loopback Interface
++++++++++++++++++++++++++
Summary/Usage
--------------
create loopback interface [mac <*mac-addr*>] [instance <*instance*>]
Description
------------
Create a loopback interface. Optionally, a MAC Address can be provided. If not provided, de:ad:00:00:00:<*loopId*> will be used.
Example Usage
--------------
The following two command syntaxes are equivalent:
.. code-block:: console
vpp# loopback create-interface [mac <*mac-addr*>] [instance <*instance*>]
vpp# create loopback interface [mac <*mac-addr*>] [instance <*instance*>]
Example of how to create a loopback interface:
.. code-block:: console
vpp# create loopback interface
Declaration and Implementation
-------------------------------
**Declaration:** create_loopback_interface_command (src/vnet/ethernet/interface.c line 879)
**Implementation:** create_simulated_ethernet_interfaces
Create Sub-Interfaces
++++++++++++++++++++++
This command is used to add VLAN IDs to interfaces, also known as
subinterfaces. The primary input to this command is the *interface*
and *subId* (subinterface Id) parameters. If no additional VLAN ID is
provide, the VLAN ID is assumed to be the *subId*. The VLAN ID and
*subId* can be different, but this is not recommended.
This command has several variations:
- **create sub-interfaces** <*interface*> <*subId*> - Create a subinterface
to process packets with a given 802.1q VLAN ID (same value as the
*subId*).
- **create sub-interfaces** <*interface*> <*subId*> default - Adding the
*default* parameter indicates that packets with VLAN IDs that do
not match any other subinterfaces should be sent to this
subinterface.
- **create sub-interfaces** <*interface*> <*subId*> untagged - Adding the
*untagged* parameter indicates that packets no VLAN IDs should be
sent to this subinterface.
- **create sub-interfaces** <*interface*> <*subId*>-<*subId*> - Create a
range of subinterfaces to handle a range of VLAN IDs.
- **create sub-interfaces** <*interface*> <*subId*> dot1q|dot1ad <*vlanId*>|any
[exact-match] - Use this command to explicitly specify the outer VLAN ID,
or to make the VLAN ID different from the *subId*.
- **create sub-interfaces** <*interface*> <*subId*> dot1q|dot1ad <*vlanId*>|any
inner-dot1q <*vlanId*>|any [exact-match] - Use this command to
specify the outer VLAN ID and the inner VLAN ID.
When *dot1q* or *dot1ad* is explicitly entered, subinterfaces can be
configured as either *exact-match* or *non-exact match*. *Non-exact match* is
the CLI default. If *exact-match* is specified, packets must have the
same number of VLAN tags as the configuration. For *non-exact-match*,
packets must at least that number of tags. L3 (routed) interfaces must
be configured as exact-match. L2 interfaces are typically configured as
non-exact-match. If *dot1q* or *dot1ad* is NOT entered, then the
default behavior is *exact-match*.
Use the **show interface** command to display all subinterfaces.
Summary/Usage
-------------
.. code-block:: shell
create sub-interfaces <interface> {<subId> [default|untagged]} | {<subId>-<subId>} | {<subId> dot1q|dot1ad <vlanId>|any [inner-dot1q <vlanId>|any] [exact-match]}
Example Usage
--------------
Example of how to create a VLAN subinterface 11 to process packets on 802.1q VLAN ID 11:
.. code-block:: console
vpp# create sub-interfaces GigabitEthernet2/0/0 11
The previous example is shorthand and is equivalent to:
.. code-block:: console
vpp# create sub-interfaces GigabitEthernet2/0/0 11 dot1q 11 exact-match
Example of how to create a subinterface number that is different from the VLAN ID:
.. code-block:: console
vpp# create sub-interfaces GigabitEthernet2/0/0 11 dot1q 100
Examples of how to create q-in-q and q-in-any subinterfaces:
.. code-block:: console
vpp# create sub-interfaces GigabitEthernet2/0/0 11 dot1q 100 inner-dot1q 200
vpp# create sub-interfaces GigabitEthernet2/0/0 12 dot1q 100 inner-dot1q any
Examples of how to create dot1ad interfaces:
.. code-block:: console
vpp# create sub-interfaces GigabitEthernet2/0/0 11 dot1ad 11
vpp# create sub-interfaces GigabitEthernet2/0/0 12 dot1ad 100 inner-dot1q 200
Examples of *exact-match* versus non-exact match. A packet with outer VLAN 100 and inner VLAN 200 would match this interface, because the default is non-exact match:
.. code-block:: console
vpp# create sub-interfaces GigabitEthernet2/0/0 5 dot1q 100
However, the same packet would NOT match this interface because *exact-match* is specified and only one VLAN is configured, but packet contains two VLANs:
.. code-block:: console
vpp# create sub-interfaces GigabitEthernet2/0/0 5 dot1q 100 exact-match
Example of how to created a subinterface to process untagged packets:
.. code-block:: console
vpp# create sub-interfaces GigabitEthernet2/0/0 5 untagged
Example of how to created a subinterface to process any packet with a VLAN ID that does not match any other subinterface:
.. code-block:: console
vpp# create sub-interfaces GigabitEthernet2/0/0 7 default
When subinterfaces are created, they are in the down state. Example of how to enable a newly created subinterface:
.. code-block:: console
vpp# set interface GigabitEthernet2/0/0.7 up
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