NS-peering edge cluster The engineered VxBlock System implementation of VMware NSX-T Data Center deploys medium-sized edge VMs for the NS-Peering edge cluster. This cluster is used exclusively for North-South traffic flows. It should not be running any services other than BGP peering and ECMP. The medium appliance meets these requirements. 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.