Chapter 3. Alternative provisioning network methods

This section contains information about other methods that you can use to configure the provisioning network to accommodate routed spine-leaf with composable networks.

3.1. VLAN Provisioning network

In this example, the director deploys new overcloud nodes through the provisioning network and uses a VLAN tunnel across the L3 topology. For more information, see Figure 3.1, “VLAN provisioning network topology”. If you use a VLAN provisioning network, the director DHCP servers can send DHCPOFFER broadcasts to any leaf. To establish this tunnel, trunk a VLAN between the Top-of-Rack (ToR) leaf switches. In the following diagram, the StorageLeaf networks are presented to the Ceph storage and Compute nodes; the NetworkLeaf represents an example of any network that you want to compose.

Figure 3.1. VLAN provisioning network topology

OpenStack Spine Leaf 466050 0218 VLAN

3.2. VXLAN Provisioning network

In this example, the director deploys new overcloud nodes through the provisioning network and uses a VXLAN tunnel to span across the layer 3 topology. For more information, see Figure 3.2, “VXLAN provisioning network topology”. If you use a VXLAN provisioning network, the director DHCP servers can send DHCPOFFER broadcasts to any leaf. To establish this tunnel, configure VXLAN endpoints on the Top-of-Rack (ToR) leaf switches.

Figure 3.2. VXLAN provisioning network topology

OpenStack Spine Leaf 466050 0218 VXLAN