Configuration of Breakout Ports
Breakout cables are suitable for very short links and offer a cost effective way to connect within racks and across adjacent racks. Breakout enables a 40 Gigabit (Gb) port to be split into four independent and logical 10Gb ports, a 100Gb port to be split into four independent and logical 25Gb ports, or a 400Gb port to be split into four independent and logical 100Gb ports.
You configure breakout on the down links (also known as the access-facing ports or downlink ports) and fabric links of the switches. Fabric links form the connections between the leaf switches and spine switches, or between the tier 1 leaf switches and tier 2 leaf switches for a multi-tier topology.