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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 dynamically through an external DHCP service.

The minimal overcloud network configuration includes:

  • 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 the different overcloud network types.
  • Multiple NIC configuration - Each NIC uses a subnet for a different overcloud network type.
Note

The Provisioning network only uses the native VLAN.

The overcloud network configuration for Ceph (HCI), with NFV SR-IOV topology (see NFV SR-IOV with HCI) includes:

  • 3x1G ports, for director, provisioning OVS (isolated in case of SR-IOV)
  • 6x10G, 2x10G for Ceph other for DPDK SR-IOV
Note

Ceph HCI is technology preview in Red Hat OpenStack Platform 10. For more information on the support scope for features marked as technology previews, see Technology Preview.

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