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Figure 15. BGP EVPN topology with anycast gateways and an indirect gateway
In this deployment example, four VNIs are used: 1641, 1642, and 1643, and 3939. All VNIs are configured all on the four leaf switches. However, only VNIs 1641, 1642, and 1643 are configured with anycast gateways. Because these VNIs have anycast gateways, VMs on those VNIs which are routing to other networks can use the same gateway information while behind different leaf pairs. When those VMs route, their local leaf switches will always be doing the routing. This replaces VRRP and enables VMs to migrate from one leaf pair to another without the need to change the network configuration. It also eliminates hair pinning and improves link utilization since routing is performed closer to the source.
Note: VNI 1611 is used in the management domain and hosts all management VMs, including vCenter, PSCs, and the NSX-T management cluster.