please help me on this
If T0 is Tier-0, this link could be helpful explaining routing between tiers:
One of the differences between NSX-T and NSX-V seems that it is possible to connect 2 DLRs for Multitier routing.
https://blogs.vmware.com/networkvirtualization/2018/02/nsx-t-multi-tiered-routing-architecture.html/