In the scenario of dual sites in metropolitan region, two Edge nodes are deployed at each site, and the four Edge nodes belong to the same Edge Cluster.
Then T0 uses A/A architecture, so are the T0-SRs of the 4 Edge nodes all in the Active state? After ECMP is enabled, which Edge node participates in north-south data forwarding, which Edge node is configured with T0-uplink?

Next, if the VMs of a segment are located at two sites, is there a way for NSX-T to make the north-south traffic of VMs in the same network segment and different sites go to the corresponding site T0-SR Edge node?
For example, VM-192.168.1.1 is located at SiteA, VM-192.168.1.2 is located at SiteB, so that the north-south traffic of 1.1 goes to SiteA's T0-Edge, and the north-south traffic of 1.2 goes to SiteB's T0-Edge. 

Is there a requirement for a T1 (with SR) architecture for this issue?