Tier 1 gateway A Tier 1 gateway is typically connected to a Tier 0 gateway in the north-bound direction and to segments in the south-bound direction. Tier 1 gateways may also provide centralized services such as load balancing, VPN services, NAT, DHCP, and so on. The VMware NSX-T Data Center for VxBlock System design includes, by default, a single Tier 1 gateway (T1-GW-1). This gateway provides a link between the two overlay-backed segments and the Tier 0 gateway that connects to the physical network. The following figure shows the topology for the Tier 0 and Tier 1 gateways: Parent topic Edge ECMP topologyIn VMware NSX-T Data Center for VxBlock Systems, ECMP provides load-balancing across multiple paths northbound from the T0s to the Cisco Nexus 9000 Series ToR switches. VMware NSX-T Data Center supports a maximum of eight paths per edge node cluster.