@ -235,6 +235,8 @@ If you are running your cluster with the default calico settings and are upgradi
* perform a manual migration to vxlan before upgrading kubespray (see migrating from IP in IP to VXLAN below)
* perform a manual migration to vxlan before upgrading kubespray (see migrating from IP in IP to VXLAN below)
* pin the pre-2.19 settings in your ansible inventory (see IP in IP mode settings below)
* pin the pre-2.19 settings in your ansible inventory (see IP in IP mode settings below)
**Note:**: Vxlan in ipv6 only supported when kernel >= 3.12. So if your kernel version <3.12,Pleasedon'tset`calico_vxlan_mode_ipv6: vxlanAlways`.Moredetailssee [#Issue 6877](https://github.com/projectcalico/calico/issues/6877).
### IP in IP mode
### IP in IP mode
To configure Ip in Ip mode you need to use the bird network backend.
To configure Ip in Ip mode you need to use the bird network backend.