Switching capacity, often referred to as backplane bandwidth, is a critical parameter that defines the maximum data throughput a network switch can handle. can I know the throughput of the switches, I mean the whole throughput that the switch can process at a period of time, does it has a formula for example (sum the speed of all ports!) or it is has no relation to the port speed? This is the datasheet of 4500 series. If you shrink the packets to 500 bytes each, the switch now needs to handle 250,000 packets per second (250 kpps) to reach 1Gbps of throughput, which is a lot more work. As packet sizes decrease the switch will have to do a lot more processing and forwarding work just to maintain the same. Cisco Catalyst 9600 Series Switches are purpose-built for resiliency at scale and with comprehensive security that allows your business to grow at a low total operational cost. Built on the new Cisco Silicon One™ ASICs, Cisco C9350 Series Smart Switches deliver up to 10 Gbps multigigabit Ethernet and 90W. Obviously, through the method of estimation is of no use, I think it should be considered from two aspects: 1) the capacity of all ports X number of ports and 2 times should be less than backplane bandwidth, non-blocking switching enables full-duplex, that the switch has the conditions to maximize.