Logical Networks allow segregation of different types of traffic. According to Red Hat Training Manual, it is recommended to have 3 types of network

1. Management Network – Network to connect hypervisor (RHEV-H) nodes to the RHEV Manager
2. Storage Network – Network to connect RHEV-H  to NFS and iSCSI. If you are using FC, there is no need to create a separate network since it is using SAN
3. Public Network –  Connect the Gateway Router, the RHEV-M systems and RHEV-H Nodes

Configure Logical Networks

Data Centre > Networks > New Loginal Networks

Configure Network Mac Address Pool

1. View Current Settings

# rhevm-config -g MacPoolRanges
MacPoolRanges: 00:1a:4a:9f:7e:00-00:1a:4a:9f:7e:ff version: general

2. Set the Mac range to 52:54:00:56:00:01 – 52:54:00:56:00:FF

# rhevm-config -s MacPoolRanges=52:54:00:56:00:01-52:54:00:56:00:FF

3. Restart ovirt-engine engine

# service ovirt-engine restart