OCPBUGS-57928: Added forbidden reserved interface names to various Nm

Author: dfitzmau

modules/node-network-configuration-policy-file.adoc

@@ -10,6 +10,26 @@ A `NodeNetworkConfigurationPolicy` (NNCP) manifest file defines policies that th
 
 After you apply a node network policy to a node, the Kubernetes NMState Operator configures the networking configuration for nodes according to the node network policy details. 
 
+[WARNING]
+====
+The following list of interface names are reserved and you cannot use the names with NMstate configurations:
+
+* `br-ext`
+* `br-int`
+* `br-local`
+* `br-nexthop`
+* `br0`
+* `ext-vxlan`
+* `ext`
+* `genev_sys_*`
+* `int`
+* `k8s-*`
+* `ovn-k8s-*`
+* `patch-br-*`
+* `tun0`
+* `vxlan_sys_*`
+====
+
 You can create an NNCP by using either the {oc-first} or the {product-title} web console. As a postinstallation task you can create an NNCP or edit an existing NNCP.
 
 [NOTE]