diff --git a/doc/source/ovn/migration.rst b/doc/source/ovn/migration.rst
index 21237678827..28f594b0ec4 100644
--- a/doc/source/ovn/migration.rst
+++ b/doc/source/ovn/migration.rst
@@ -155,6 +155,12 @@ Perform the following steps in the undercloud
      server that will be used as a NFS server to store the backup.
      Default: 192.168.24.1
 
+   * BACKUP_MIGRATION_CTL_PLANE_CIDRS - Only used if CREATE_BACKUP is enabled.
+     A comma separated string of control plane subnets in CIDR notation for the
+     controllers being backed up. The specified subnets will be used to enable
+     NFS remote clients connections.
+     Default: 192.168.24.0/24
+
    .. warning::
 
       Please note that VALIDATE_MIGRATION requires enough quota (2
diff --git a/tools/ovn_migration/tripleo_environment/ovn_migration.sh b/tools/ovn_migration/tripleo_environment/ovn_migration.sh
index 271783e74a5..14c6ce7d0c2 100644
--- a/tools/ovn_migration/tripleo_environment/ovn_migration.sh
+++ b/tools/ovn_migration/tripleo_environment/ovn_migration.sh
@@ -42,7 +42,8 @@ LANG=C
 : ${VALIDATE_MIGRATION:=False}
 : ${DHCP_RENEWAL_TIME:=30}
 : ${CREATE_BACKUP:=True}
-: ${BACKUP_MIGRATION_IP:=192.168.24.1} # TODO: Document this new var
+: ${BACKUP_MIGRATION_IP:=192.168.24.1}
+: ${BACKUP_MIGRATION_CTL_PLANE_CIDRS:=192.168.24.0/24}
 
 
 check_for_necessary_files() {
@@ -328,6 +329,7 @@ start_migration() {
     -e overcloudrc=$OVERCLOUDRC_FILE \
     -e stackrc=$STACKRC_FILE \
     -e backup_migration_ip=$BACKUP_MIGRATION_IP \
+    -e backup_migration_ctl_plane_cidrs=$BACKUP_MIGRATION_CTL_PLANE_CIDRS \
     -e create_backup=$CREATE_BACKUP \
     -e ansible_inventory=$inventory_file \
     -e validate_migration=$VALIDATE_MIGRATION $*
diff --git a/tools/ovn_migration/tripleo_environment/playbooks/roles/recovery-backup/tasks/main.yml b/tools/ovn_migration/tripleo_environment/playbooks/roles/recovery-backup/tasks/main.yml
index 6ed510316ae..d018183fb5c 100644
--- a/tools/ovn_migration/tripleo_environment/playbooks/roles/recovery-backup/tasks/main.yml
+++ b/tools/ovn_migration/tripleo_environment/playbooks/roles/recovery-backup/tasks/main.yml
@@ -36,6 +36,7 @@
         --setup-nfs \
         --extra-vars '{
                 "tripleo_backup_and_restore_server": {{ backup_migration_ip }},
+                "tripleo_backup_and_restore_clients_nets": {{ backup_migration_ctl_plane_cidrs.split(',') }},
                 "nfs_server_group_name": {{ revert_preparation_server_name }}
               }'