Back of the envelope math using modern hypervisors that can fit loads of vms in a single U

- let’s put 500 vms on a single one. with 128c256t CPUs it’s easy

- say you can fit 30 of those in a single rack (the common rack is 42U) due to power constraints

- and place 10 of those racks

That’s 500 x 30 x 10 = 150000 nodes to address. With 10 racks you already blow past the scaling limits of the common datacenter switch when it comes to MAC addresses. Here are the limits for Cisco’s Nexus 9000 series, a very common datacenter switch: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/ne...