openstack
/
neutron
Code Issues Proposed changes

Add VXLAN support reference in the OVN installation guide 

That includes the limitation of ML2/OVN for VXLAN networks to
a maximum of 4096 networks and the explanation.

Closes-Bug: #1998085
Change-Id: I0b0ba353c219a49acd80edecd0997d1f653b0192
This commit is contained in:
Rodolfo Alonso Hernandez 2022-11-18 17:40:41 +01:00
parent 0384b3193b
commit 1a9ae924fd
1 changed files with 22 additions and 0 deletions
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22
doc/source/install/ovn/manual_install.rst
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@ -201,6 +201,23 @@ primary node. See the :doc:`/ovn/faq/index` for more information.
The default for ``max_header_size``, ``30``, is too low for OVN. The default for ``max_header_size``, ``30``, is too low for OVN.
OVN requires at least ``38``. OVN requires at least ``38``.
* Optionally, enable support for VXLAN type networks. Because of limited
space in VXLAN VNI to pass over the needed information that requires
OVN to identify a packet, the header size to contain the segmentation ID
is reduced to 12 bits, that allows a maximum number of 4096 networks.
The same limitation applies to the number of ports in each network, that
are also identified with a 12 bits header chunk, limiting their number
to 4096 ports. Please check [1]_ for more information.
.. code-block:: ini
[ml2]
...
type_drivers = geneve,vxlan
[ml2_type_vxlan]
vni_ranges = 1001:1100
* Optionally, enable support for VLAN provider and self-service * Optionally, enable support for VLAN provider and self-service
networks on one or more physical networks. If you specify only networks on one or more physical networks. If you specify only
the physical network, only administrative (privileged) users can the physical network, only administrative (privileged) users can
@ -354,3 +371,8 @@ Verify operation
# ovn-sbctl show # ovn-sbctl show
<output> <output>
References
----------
.. [1] https://mail.openvswitch.org/pipermail/ovs-dev/2020-September/375189.html