Added new info

Author: johnmarco

articles/openshift/howto-multiple-ips.md

@@ -5,7 +5,7 @@ author: johnmarco
 ms.author: johnmarc
 ms.service: azure-redhat-openshift
 ms.topic: article
-ms.date: 01/30/2024
+ms.date: 03/05/2024
 #Customer intent: As an ARO SRE, I need to configure multiple outbound IP addresses per ARO cluster load balancers
 ---
 # Configure multiple IP addresses per ARO cluster load balancer (Preview)
@@ -14,9 +14,31 @@ ARO public clusters are created with a public load balancer that's used for outb
 
 You can configure up to 20 IP addresses per cluster. The outbound rules and frontend IP configurations are adjusted to accommodate the number of IP addresses.
 
-## Requirements (Preview only)
+## Requirements
 
-In order to run the commands in this article, you must first download the aro extension wheel file from [https://aka.ms/az-aroext-latest](https://aka.ms/az-aroext-latest). To install the extension, run the following command:
+The multiple public IPs feature is only available on the current network architecture used by ARO; older clusters do not support this feature. If your cluster was created before OpenShift Container Platform (OCP) version 4.5, this feature won't be available even if you've upgraded your OCP version since then.
+
+If you're unsure if your cluster was created before the current version of OCP, use the following commands to check.
+
+To get the cluster managed resource group:
+
+```
+RESOURCEGROUP=aro-rg   # the name of the resource group your cluster is in
+CLUSTER=cluster        # the name of your cluster
+CLUSTER_RESOURCEGROUP=$(az aro show -g $RESOURCEGROUP -n $CLUSTER --query clusterProfile.resourceGroupId -o tsv | awk -F'/' '{print $NF}')
+```
+
+List the network load balancers:
+
+```
+az network lb list -g $CLUSTER_RESOURCEGROUP -o table
+```
+
+If you have a loadbalancer named `$CLUSTER-public-lb`, the cluster has the older network architecture and cannot use the multiple public IP feature.
+
+### Download ARO extension wheel file (Preview only)
+
+In order to run the commands in this article, you must first download the ARO extension wheel file from [https://aka.ms/az-aroext-latest](https://aka.ms/az-aroext-latest). To install the extension, run the following command:
 
 `az extension add -s <path to downloaded whl file>`