1NM-OPENVSWITCH(7)        Open vSwitch support overview       NM-OPENVSWITCH(7)
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NAME

6       nm-openvswitch - overview of NetworkManager Open vSwitch support
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OVERVIEW

9       NetworkManager includes basic Open vSwitch support, good enough to be
10       capable of setting up simple Open vSwitch configurations. It is not
11       extensive and does not expose all functionality of Open vSwitch
12       provides. For large or complicated deployments users are advised to use
13       native tools shipped with Open vSwitch. This document seeks to provide
14       overview of functionality currently provided by NetworkManager, its
15       capabilities and limitations.
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17       First and foremost: NetworkManager applies the configuration by
18       modifying the OVSDB directly. Its configuration model follows the OVSDB
19       database model closely and it does not provide the level of abstraction
20       ovs-vsctl provides.
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22       In practical terms it means the following:
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24       ·   NetworkManager only ever talks to a single OVSDB instance via an
25           UNIX domain socket.
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27       ·   The configuration is made up of Bridges, Ports and Interfaces.
28           Interfaces are always enslaved to Ports, and Ports are always
29           enslaved to Bridges.
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31       ·   NetworkManager only creates Bridges, Ports and Interfaces you ask
32           it to. Unlike ovs-vsctl, it doesn't create the local interface nor
33           its port automatically.
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35       ·   You can't enslave Interface directly to a Bridge. You always need a
36           Port, even if it has just one interface.
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38       ·   There are no VLANs. The VLAN tagging is enabled by setting a
39           ovs-port.tag property on a Port.
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41       ·   There are no bonds either. The bonding is enabled by enslaving
42           multiple Interfaces to a Port and configured by setting properties
43           on a port.
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45
46   Bridges
47       Bridges are represented by connections of ovs-bridge type. Due to the
48       limitations of OVSDB, "empty" Bridges (with no Ports) can't exist.
49       NetworkManager inserts the records for Bridges into OVSDB when a Port
50       is enslaved.
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52   Ports
53       Ports are represented by connections of ovs-port type. Due to the
54       limitations of OVSDB, "empty" Ports (with no Interfaces) can't exist.
55       Ports can also be configured to do VLAN tagging or Bonding.
56       NetworkManager inserts the records for Ports into OVSDB when an
57       Interface is enslaved. Ports must be enslaved to a Bridge.
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59   Interfaces
60       Interfaces are represented by a connections enslaved to a Port. The
61       system interfaces (that have a corresponding Linux link) have a
62       respective connection.type of the link (e.g. "wired", "bond", "dummy",
63       etc.). Other interfaces ("internal" or "patch" interfaces) are of
64       ovs-interface type. The OVSDB entries are inserted upon enslavement to
65       a Port.
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EXAMPLES

68       Example 1. Creating a Bridge with a single internal Interface
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70           $ nmcli conn add type ovs-bridge conn.interface bridge0
71           Connection 'ovs-bridge-bridge0' (d10fc64d-1d48-4394-a1b8-e1aea72f27d5) successfully added.
72           $ nmcli conn add type ovs-port conn.interface port0 master bridge0
73           Connection 'ovs-port-port0' (5ae22bae-bba4-4815-9ade-7e635633e1f0) successfully added.
74           $ nmcli conn add type ovs-interface slave-type ovs-port conn.interface iface0 \
75             master port0 ipv4.method manual ipv4.address 192.0.2.1/24
76           Connection 'ovs-interface-iface0' (3640d2a1-a2fd-4718-92f1-cffadb5b6cdc) successfully added.
77
78       As said above, you need to create a Port even for a single interface.
79       Also, before you add the Interface, the Bridge and Port devices appear
80       active, but are not configured in OVSDB yet. You can inspect the
81       results with ovs-vsctl show.
82
83       Example 2. Adding a Linux interface to a Bridge
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85           $ nmcli conn add type ovs-port conn.interface port1 master bridge0
86           Connection 'ovs-port-port1' (67d041eb-8e7b-4458-afee-a1d07c9c4552) successfully added.
87           $ nmcli conn add type ethernet conn.interface eth0 master port1
88           Connection 'ovs-slave-eth0' (d459c45c-cf78-4c1c-b4b7-505e71379624) successfully added.
89
90       Again, you need a port.
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92       Example 3. Creating a VLAN
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94           $ nmcli conn add type ovs-port conn.interface port2 master bridge0 ovs-port.tag 120
95           Connection 'ovs-port-port2' (3994c093-4ef7-4549-a4fd-627b831c3cb8) successfully added.
96           $ nmcli conn add type ethernet conn.interface eth1 master port2
97           Connection 'ovs-slave-eth1' (099be06e-71ad-484d-8d5a-fcadc5f207f5) successfully added.
98
99       It's just a port with a tag.
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101       Example 4. Creating a Bond
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103           $ nmcli conn add type ovs-port conn.interface bond0 master bridge0
104           Connection 'ovs-port-bond0' (d154ebf9-e999-4e1b-a084-a3de53d25d8a) successfully added.
105           $ nmcli conn add type ethernet conn.interface eth2 master bond0
106           Connection 'ovs-slave-eth2' (475ac1bf-30b2-4534-a877-27f33f58b082) successfully added.
107           $ nmcli conn add type ethernet conn.interface eth3 master bond0
108           Connection 'ovs-slave-eth3' (8dedeecb-ed12-482b-b77a-24a4fb835136) successfully added.
109
110       It's just a Port with multiple interfaces. See nm-settings manual for
111       Bonding options you can use with "nmcli c add" or "nmcli c modify". You
112       could even set a VLAN tag on the same Port to do VLAN tagging and
113       bonding at the same time.
114

BUGS

116       ·   Not all Open vSwitch capabilities are supported.
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118       ·   Open vSwitch devices don't expose many useful properties on D-Bus.
119
120       Probably many more.
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SEE ALSO

123       RFC 7047: The Open vSwitch Database Management Protocol[1], ovs-
124       vsctl(8), ovs-vswitchd.conf.db(5), nm-settings(5), nmcli(1)
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NOTES

127        1. RFC 7047: The Open vSwitch Database Management Protocol
128           https://www.rfc-editor.org/rfc/rfc7047.txt
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132NetworkManager 1.20.8                                        NM-OPENVSWITCH(7)
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