How traffic will traverse from DR to SR in NSXT ?
Kindly check https://nsx.techzone.vmware.com/resource/nsx-t-reference-design-guide-3-0#_Toc59008623 ( Logical Routing Section)
Kindly check https://nsx.techzone.vmware.com/resource/nsx-t-reference-design-guide-3-0#_Toc59008623 ( Logical Routing Section)