OCPBUGS-50855:adds warning for VRF and UDN

Author: JoeAldinger

networking/k8s_nmstate/k8s-nmstate-updating-node-network-config.adoc

@@ -11,6 +11,11 @@ After you install the Kubernetes NMState Operator, you can use the Operator to o
 
 For more information about how to install the NMState Operator, see xref:../../networking/networking_operators/k8s-nmstate-about-the-k8s-nmstate-operator#k8s-nmstate-about-the-k8s-nmstate-operator[Kubernetes NMState Operator].
 
+[WARNING]
+====
+When configuring Virtual Route Forwarding (VRF) users must change their VRFs to a table ID lower than 1000 as higher than 1000 is reserved for {product-title}.
+====
+
 // Viewing the network state of a node by using the CLI
 include::modules/virt-viewing-network-state-of-node.adoc[leveloffset=+1]
 

networking/metallb/metallb-frr-k8s.adoc

@@ -13,7 +13,10 @@ As a cluster administrator, you can use the `FRRConfiguration` custom resource (
 
 image::695_OpenShift_MetalLB_FRRK8s_integration_0624.png[MetalLB integration with FRR]
 
-
+[WARNING]
+====
+When configuring Virtual Route Forwarding (VRF) users must change their VRFs to a table ID lower than 1000 as higher than 1000 is reserved for {product-title}.
+====
 // FRR configurations
 include::modules/nw-metallb-frr-configurations.adoc[leveloffset=+1]