Federico Guerrini and Amy Colyer go over the Phase 1 Networking Scenario in the Network Design Guide for AVS. This scenario covers connectivity between your on-premises datacenter and Azure VMware Solution.
Federico discusses the flowchart for making the best decision for your use case, the IPSec VPN option and a third option if you cannot use Global Reach and IPSec VPN.
Reference Architecture: https://aka.ms/avsaccelerator
Reference Implementation: https://aka.ms/avsenterprisescalerepo