SFS uses the 172.16.0.0/16, and 172.30.0.0/16 IP address blocks internally for the leaf-spine network configuration. SFS uses BGP ASNs 65011 for leafs, and 65012 for spines. If these networks or ASNs conflict with your environment, you can change them in the SFS UI by clicking Global Settings > Fabric Settings. See the SmartFabric Services User Guide for more information.