The ISR 4000 series routers represent a significant change in Cisco’s branch router architecture. With independent control and data planes, the ISR 4000 can provide consistent throughput numbers regardless of what features are in use.
Cisco Router Throughput Factors
However, total performance is most often controlled not by the router, but by the WAN circuit itself. For example, a small branch office with a cable Internet connection may only need 25 or 50Mbps of throughput. This small branch office will also have very little need of CPU-intensive features, such as internet-facing BGP or complex access control policies. Because of this limited need, routers from any of the three ISR generations can easily meet the needs of this site, so it’s important to perform a careful examination of the site requirements to make the best router selection.
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Cisco Throughput Comparison Chart
| Original ISR Series | ISR G2 Series | ISR 4000 Series |
|---|---|---|
| Cisco 1841 Throughput – 35Mbps | Cisco 1941 Throughput – 153Mbps | ISR 4321 – 50 – 100Mbps |
| Cisco 2801 Throughput – 45Mbps | Cisco 2901 Throughput – 167Mbps | ISR 4331 – 100 – 300Mbps |
| Cisco 2811 Throughput – 61Mbps | Cisco 2911 Throughput – 180Mbps | ISR 4351 – 200 – 400Mbps |
| Cisco 2821 Throughput – 80Mbps | Cisco 2921 Throughput – 180Mbps | ISR 4431 – 500 – 1000Mbps |
| Cisco 2851 Throughput – 112Mbps | Cisco 2951 Throughput – 297Mbps | ISR 4451 – 1 – 2Gbps |
| Cisco 3825 Throughput – 176Mbps | Cisco 3925 Throughput – 426Mbps | |
| Cisco 3845 Throughput – 256Mbps | Cisco 3945 Throughput – 502Mbps | |
| Cisco 3925E Throughput – 945Mbps | ||
| Cisco 3945E Throughput – 1.5Gbps |
While the ISR G1 is nearing end of support and the ISR G2 is nearing end of sale, Curvature will continue to sell and maintain these product lines for as long as they remain relevant and useful.
Note: ISR 4400 throughput is governed by a license; the first number indicates the base throughput, while the second number indicates the license-upgraded throughput. ISR G1 and G2 routers have no hard throughput limit.
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