Merge pull request #78028 from openshift-cherrypick-robot/cherry-pick-77984-to-enterprise-4.16

[enterprise-4.16] Fixes live migration ip addresses

Author: stevsmit

modules/nw-ovn-kubernetes-live-migration-about.adoc

@@ -67,14 +67,15 @@ During the limited live migration, both OVN-Kubernetes and OpenShift SDN run in
 ** `InternalTransitSwitchSubnet`
 ** `internalJoinSubnet`
 
-* Unless otherwise configured, OVN-Kubernetes uses the following IP address ranges:
-** `100.64.0.0/16`. This IP address range is used for the `internalJoinSubnet` parameter of OVN-Kubernetes by default. If this IP address range is already in use, enter the following command to update it to `100.63.0.0/16`:
+* OVN-Kubernetes reserves the `100.64.0.0/16` and `100.88.0.0/16` IP address ranges. If OpenShift SDN has been configured to use either of these IP address ranges, you must patch them to use a different IP address range before starting the limited live migration.
+
+** `100.64.0.0/16`. This IP address range is used for the `internalJoinSubnet` parameter of OVN-Kubernetes by default. If this IP address range is already in use, enter the following command to update it to a different range, for example, `100.63.0.0/16`:
 +
 [source,terminal]
 ----
 $ oc patch network.operator.openshift.io cluster --type='merge' -p='{"spec":{"defaultNetwork":{"ovnKubernetesConfig":{"ipv4":{"internalJoinSubnet": "100.63.0.0/16"}}}}}'
 ----
-** `100.88.0.0/16`. This IP address range is used for the `internalTransSwitchSubnet` parameter of OVN-Kubernetes by default. If this IP address range is already in use by another network, enter the following command to update it to `100.99.0.0/16`:
+** `100.88.0.0/16`. This IP address range is used for the `internalTransSwitchSubnet` parameter of OVN-Kubernetes by default. If this IP address range is already in use, enter the following command to update it to a different range, for example, `100.99.0.0/16`:
 +
 [source,terminal]
 ----