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openshift-docs/modules/configuring-layer-two-switched-topology.adoc

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// Module included in the following assemblies:
//
// * networking/multiple_networks/secondary_networks/creating-secondary-nwt-ovnk.adoc
:_mod-docs-content-type: CONCEPT
[id="configuration-layer-two-switched-topology_{context}"]
= Configuration for a layer 2 switched topology
[role="_abstract"]
The switched (layer 2) topology networks interconnect the workloads through a cluster-wide logical switch. This configuration can be used for IPv6 and dual-stack deployments.
[NOTE]
====
Layer 2 switched topology networks only allow for the transfer of data packets between pods within a cluster.
====
The following JSON example configures a switched secondary network:
[source,json]
----
{
"cniVersion": "0.3.1",
"name": "l2-network",
"type": "ovn-k8s-cni-overlay",
"topology":"layer2",
"subnets": "10.100.200.0/24",
"mtu": 1300,
"netAttachDefName": "ns1/l2-network",
"excludeSubnets": "10.100.200.0/29"
}
----