Chapter 4. Network considerations

The undercloud host requires at least the following networks:

Provisioning network - Provides DHCP and PXE-boot functions to help discover bare-metal systems for use in the overcloud.
External network - A separate network for remote connectivity to all nodes. The interface connecting to this network requires a routable IP address, either defined statically, or generated dynamically from an external DHCP service.

The minimal overcloud network configuration includes the following NIC configurations:

Single NIC configuration - One NIC for the provisioning network on the native VLAN and tagged VLANs that use subnets for the different overcloud network types.
Dual NIC configuration - One NIC for the provisioning network and the other NIC for the external network.
Dual NIC configuration - One NIC for the provisioning network on the native VLAN, and the other NIC for tagged VLANs that use subnets for different overcloud network types.
Multiple NIC configuration - Each NIC uses a subnet for a different overcloud network type.

For more information on the networking requirements, see Networking requirements.

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