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In case Controller/Network Node && N*Computes Nodes Setup
Compute :

NIC1 - MGMT 
NIC2 - VXLAN (GRE) either VLAN connectivity to Controller

Controller

NIC1 - MGMT 
NIC2 - VXLAN (GRE) either VLAN connectivity to Compute
NIC3 - External Network

Using same NICs for MGMT and VXLAN tunnelling is good only for POC deployments.

In case Controller/Network Node && N*Computes Nodes Node Setup
Compute :

NIC1 - MGMT 
NIC2 - VXLAN (GRE) either VLAN connectivity to Controller

Controller

NIC1 - MGMT 
NIC2 - VXLAN (GRE) either VLAN connectivity to Compute
NIC3 - External Network

Using same NICs for MGMT and VXLAN tunnelling is good only for POC deployments.

In case Controller/Network Node && N*Computes N*Compute Node Setup
Compute :

NIC1 - MGMT 
NIC2 - VXLAN (GRE) either VLAN connectivity to Controller

Controller

NIC1 - MGMT 
NIC2 - VXLAN (GRE) either VLAN connectivity to Compute
NIC3 - External Network

Using same NICs for MGMT and VXLAN tunnelling is good only for POC deployments.