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In the R1 release the following subnets are fixed of length /24
'oob' network
'host' network
'pxe' network providing 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.
'ksn' network
'storage' network
'neutron' network
'datapath' network
'vxlan' network