The purpose of this page is to describe how SR-IOV works with OVN. Prior to reading this document, it is recommended to first read the basic guide for SR-IOV.
The SR-IOV feature is leverage by OVN external
ports. For more
information about external ports, its scheduling and troubleshoot,
please check the External Ports guide.
There are a very few differences between setting up an environment for SR-IOV for the OVS and OVN Neutron drivers. As mentioned at the beginning of this document, the instructions from the the basic guide for SR-IOV are required for getting SR-IOV working with the OVN driver.
The only differences required for an OVN deployment are:
When configuring the mechanism_drivers
in the ml2_conf.ini file
we should specify ovn
driver instead of the openvswitch
driver
Disabling the Neutron DHCP agent
Deploying the OVN Metadata agent on the gateway nodes (controller or networker nodes)
The current SR-IOV implementation for the OVN Neutron driver has a few known limitations that should be addressed in the future:
Routing on VLAN tenant network will not work with SR-IOV. This is because the external ports are not being co-located with the logical router’s gateway ports, for more information take a look at bug #1875852.
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