When IPv6 is disables in `/boot/grub2/grub.cfg`:
```
linux16 ... ipv6.disable=1
```
Then GENEVE interface does not come up properly.
```
# ovs-vsctl show
Port "ovn-14a54f-0"
Interface "ovn-14a54f-0"
type: geneve
options: {csum="true", key=flow, remote_ip="10.10.10.10"}
error: "could not add network device ovn-14a54f-0 to ofproto
(Address family not supported by protocol)"
```
Additionally, run the following commands:
```
# cat /proc/version
Linux version 3.10.0-514.21.1.el7.x86_64
(mockbu...@x86-020.build.eng.bos.redhat.com) (gcc version 4.8.5 20150623 (Red
Hat 4.8.5-11) (GCC) ) #1 SMP Sat Apr 22 02:41:35 EDT 2017
# ovs-vswitchd --version
ovs-vswitchd (Open vSwitch) 2.9.0
```
When IPv6 is enabled, then OVN works properly.
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