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In the R1 release the following subnets are required as a minimum

Network nameSubnet sizeNeeds to be externally routable**?Function
'oob'Any*NoProvides the connectivity between the Build server and RC and then RC and Rover/Unicycle nodes for Redfish API calls to configure/interogate the servers' BIOS.
'host'Any*YesProvides the edge site's isolated network for MaaS provisioning (MaaS runs on the genesis node once provisioned). It does not need to be routable to any other network.
'pxe'/24 fixed in R1NoProvides the connectivity and BGP route exchange for the calico network.
'ksn'/24 fixed in R1NoProvides the openstack storage network
'neutron'/24 fixed in R1NoProvides the openstack neutron network
'datapath'Defined in openstackNo ***Provides the openstack datapath network for the SR-IOV variant VMs
'vxlan'/24 fixed in R1No****Provides the openstack storage network  for the OVS-DPDK variant VMs

Notes:

* The 'oob' network may be split in to multiple subnets if required. Each server except the Build Server (and the RC if built on a VM) requires an iDRAC/iLO address which must be manually pre-provisioned into the server.

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