Hi Here are some background specifications relevant to the hybrid-cloud tosca models, with the use case variant involving ARP for Server IP address resolution. Main reference: RFC 6575 (was draft-ietf-l2vpn-arp- m ediation) Address Resolution Protocol (ARP) Mediation for IP Interworking of Layer 2 VPNs 2012-06 RFC 6575 (Proposed Standard) For the broader IETF story, a guide to l2vpn is at
https://datatracker.ietf.org/wg/l2vpn/ There are IEEE standards also relevant such as 802.1Q. That should get you started J Dale Moberg