Edge ECMP topology

In 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.

Each T0 gateway peers with each of the two Cisco Nexus 9000 Series ToR switches. This peering limits the maximum number of edge node VMs in the cluster to four.

The following figure shows a minimum edge cluster configuration with two edge node VMs peering with the ToR switches, consuming four ECMP paths:

The following figure shows a maximum edge node cluster configuration with four edge node VMs peering with the ToR switches, consuming eight ECMP paths:

This design peers each edge node with each ToR switch.