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Cajun P550R/P880/P882 Switch User Guide
Introduction to the Cajun P550R/P880/P882 Switch
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Up to 128 gigabit-speed Ethernet ports
Fan Tray There are two fan assemblies in the chassis. One fan assembly is
located on the left side of the chassis to provide air flow to the media
modules installed. The other fan assembly is located in the rear of
the chassis to provide air flow to the switch fabric. Both fan
assemblies are hot-swappable and field replaceable.
Power Supplies Only two power supplies are required to support a fully-loaded
P880/P882 Chassis. A third power supply can be installed to provide
backup should one of the other two fail.
The power subsystem provides N+1 power supply redundancy. In
addition, the installed power supplies will load share between the
installed units. The power supplies are also warm swappable (power
supplies must be turned off and unplugged before removing them
from the chassis, however the other power supplies can remain on).
Switch Fabric In 50-Series mode, the switching fabric provides a 16x16 crossbar
that provides 28.16 Gbps switching throughput (56.32 Gbps
aggregate bandwidth). In 80-Series mode, the switching fabric
provides a 31x31 crossbar that provides 69.696 Gbps switching
throughput (139.392 Gbps aggregate bandwidth).
The crossbar switch matrix provides low latency, high throughput
packet switching using a crossbar architecture.
Crossbars are inherently more scalable than shared memory
architectures. You can add more capacity simply by adding more
switch elements. By comparison, shared memory switches have an
inherent maximum upper boundary in throughput that makes
high-density, single-backplane gigabit switches impractical. This
means that as you increase the number of gigabit ports in your
network, the architecture can scale to meet your needs.
The P880/P882 chassis crossbar supports:
■ 31 fabric ports (two per I/O module slot, plus one for the
supervisor module).
■ 1.76 GB/s (in and out) on each fabric port in 50-series mode
and 2.16 GB/s (in and out) on each fabric port in 80-series
mode.
■ 28.16 GB/s total capacity, 56.32 GB/s total backplane capacity
in 50-series mode and 56.32 GB/s total capacity, 139.392 GB/
s total backplane capacity in 80-series mode.