Input Scheduling

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Similar to other access layer switches, the Catalyst 5000 Family of switches performs only FIFO queuing of ingress packets. Input scheduling is not supported, but this does not pose a significant issue if traffic does not exceed the backplane bandwidth. ccie bandwidth depends on the chassis model and supervisor engine. All Supervisor I and II Engines utilize a single 1.2-Gbps system bus for the backplane architecture. The Supervisor III Engines utilize three 1.2-Gbps system buses for total of 3.6-Gbps bandwidth in a three-system bus chassis for the backplane architecture. The three-system bus chassis encompass the 5505, 5500, and 5509 models. The three system buses on the 5505, 5500, and 5509 chassis aggregate at the supervisor engine. The supervisor engine is responsible for moving traffic between the three buses. All Ethernet line cards except the three-port, WS-X5403, and nine-port Gigabit Ethernet modules utilize a single bus connector. With the exception of the WS-X5403 and WS-X5410, all line cards attach to the first bus connector in a slot. The WS-X5403 attaches a single front-panel Gigabit Ethernet port to each bus connector on the backplane, whereas the WS-X5410 distributes traffic from all nine front-panel Gigabit ports to the three bus connectors on the backplane. The ccie sp lab training references the three buses as bus A, B, and C, respectively. To distribute traffic across the buses for single bus connecting line cards, each chassis employs a different bus connector layout per slot. In this manner, the switch distributes traffic on a line card basis by placing the three backplane bus connectors in a different order depending on a chassis slot. In a Catalyst 5505 chassis, for instance, the ccie security lab bus connector in slot 3 is A, whereas slots 4 and 5 utilize B and C, respectively, as the first bus connector. Placing three single bus line cards in slots 3 to 5 results in traffic from each line card occupying a different 1.2-Gbps system bus. Tables 4-3 to 4-6 illustrate the bus layout for each of the Catalyst 5000 Family of switches chassis.