CRS-1 is a one-slot, high-performance core router, while CRS-3 is a three-slot PE router.
CRS-3 is the continuation of the CRS series, fully compatible with all line card components, RPs, and fabric. The only advantage is larger throughput of fabric and line cards.
CRS-3 is the next generation of the CRS series, designed for 100GE performance While using the same operating system, the components are not interchangeable due to higher demands of the third generation of CRS.
CRS-3 is the continuation of the CRS series, extending the number of line cards by a factor of threat is possible to build multishelf systems that are three times larger, with throughput that is also three times larger.
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