Merge pull request #79192 from sjhala-ccs/cnv-37647

CNV-37647: Added table comparing bridge CNI and OVN-K localnet

Author: sjhala-ccs

virt/vm_networking/virt-networking-overview.adoc

@@ -8,6 +8,11 @@ toc::[]
 
 {VirtProductName} provides advanced networking functionality by using custom resources and plugins. Virtual machines (VMs) are integrated with {product-title} networking and its ecosystem.
 
+[NOTE]
+====
+You cannot run {VirtProductName} on a single-stack IPv6 cluster.
+====
+
 The following figure illustrates the typical network setup of {VirtProductName}. Other configurations are also possible.
 
 .{VirtProductName} networking overview
@@ -108,6 +113,43 @@ endif::openshift-rosa,openshift-dedicated[]
 
 . xref:../../virt/vm_networking/virt-connecting-vm-to-ovn-secondary-network.adoc#attaching-vm-to-ovn-secondary-nw[Connect the VM to the OVN-Kubernetes secondary network] by adding the network details to the VM specification.
 
+// Hiding from ROSA/OSD as Linux Bridge is not supported
+ifndef::openshift-rosa,openshift-dedicated[]
+[id="comparing-bridge-localnet"]
+=== Comparing Linux bridge CNI and OVN-Kubernetes localnet topology
+
+The following table provides a comparison of features available when using the Linux bridge CNI versus the localnet topology for an OVN-Kubernetes plugin:
+
+.Linux bridge CNI compared to an OVN-Kubernetes localnet topology
+[cols="1,1,1",options="header"]
+|===
+|Feature
+|Available on Linux bridge CNI
+|Available on OVN-Kubernetes localnet
+
+|Layer 2 access to the underlay native network	
+|Only on secondary network interface controllers (NICs)
+|Yes
+
+|Layer 2 access to underlay VLANs
+|Yes
+|Yes
+
+|Network policies
+|No
+|Yes
+
+|Managed IP pools
+|No
+|Yes
+
+|MAC spoof filtering
+|Yes
+|Yes
+
+|===
+endif::openshift-rosa,openshift-dedicated[]
+
 // Hiding in ROSA/OSD as not supported
 ifndef::openshift-rosa,openshift-dedicated[]
 xref:../../virt/vm_networking/virt-hot-plugging-network-interfaces.adoc#virt-hot-plugging-network-interfaces[Hot plugging secondary network interfaces]::