OSDOCS-11518:removes migration to SDN from 4.17 docs

Author: JoeAldinger

_topic_maps/_topic_map.yml

@@ -1492,10 +1492,6 @@ Topics:
     File: ovn-kubernetes-troubleshooting-sources
   - Name: OVN-Kubernetes traffic tracing
     File: ovn-kubernetes-tracing-using-ovntrace
-  - Name: Migrating from the OpenShift SDN network plugin
-    File: migrate-from-openshift-sdn
-  - Name: Rolling back to the OpenShift SDN network plugin
-    File: rollback-to-openshift-sdn
   - Name: Converting to IPv4/IPv6 dual stack networking
     File: converting-to-dual-stack
   - Name: Configuring internal subnets

migrating_from_ocp_3_to_4/planning-migration-3-4.adoc

@@ -164,7 +164,24 @@ For more information, see xref:../networking/network_security/network_policy/abo
 
 In {product-title} 3.11, OpenShift SDN was the default networking plugin in Red Hat OpenShift Networking. In {product-title} {product-version}, OVN-Kubernetes is now the default networking plugin.
 
-For information on migrating to OVN-Kubernetes from OpenShift SDN, see xref:../networking/ovn_kubernetes_network_provider/migrate-from-openshift-sdn.adoc#migrate-from-openshift-sdn[Migrating from the OpenShift SDN network plugin].
+For more information on the removal of the OpenShift SDN network plugin and why it has been removed see link:https://access.redhat.com/articles/7065170[OpenShiftSDN CNI removal in OCP 4.17].
+
+For information on OVN-Kubernetes features that are similar to features in the OpenShift SDN plugin see:
+
+* xref:../networking/ovn_kubernetes_network_provider/configuring-egress-ips-ovn.adoc#configuring-egress-ips[Configuring an egress IP address]
+
+* xref:../networking/network_security/egress_firewall/configuring-egress-firewall-ovn.adoc#configuring-egress-firewall-ovn[Configuring an egress firewall for a project]
+
+* xref:../networking/ovn_kubernetes_network_provider/enabling-multicast.adoc#enabling-multicast[Enabling multicast for a project]
+
+* xref:../networking/ovn_kubernetes_network_provider/deploying-egress-router-ovn-redirection.adoc#deploying-egress-router-ovn-redirection[Deploying an egress router pod in redirect mode]
+
+* xref:../networking/network_security/network_policy/multitenant-network-policy.adoc#multitenant-network-policy[Configuring multitenant isolation with network policy]
+
+[WARNING]
+====
+You should install {product-title} 4 with the OVN-Kubernetes network plugin because it is not possible to upgrade a cluster to {product-title} 4.17 if it is using the OpenShift SDN network plugin.
+====
 
 [id="migration-preparing-logging"]
 === Logging considerations