In Asymmetric routing, a packet traverses from a source to a destination in one path and takes a different path when it returns to the source.
Start from version 6.1 NSX Edge can work with ECMP – Equal Cost Multipath, ECMP traffic involved Asymmetric routing between Edges and DLR or between Edge and physical routers.
Read more:
Asymmetric routing with ECMP and Edge Firewall Enabled | VMware Professional Services
