The second control plane communication that is expected from each ESXi host is an open connection to each of the NSX controllers deployed. The NSX controller cluster is responsible for control plane information for ARP/MAC/VTEP tables. It is also used to program routes received on the Distributed Logical Router Control VM to each host (more on this in Chapter 2, Configuring VMware NSX Logical Switch Networks). From each host, we expect the netcpa daemon to have an active connection to the controller cluster on TCP port 1234.
Controller communication
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