May 8, 2020, 17:00:59

Cisco has produced enormous routers that are suitable for small-scale and large-scale computing environments. Two of Cisco’s primary router lines fall under Aggregation Services Routers (ASR) and Integrated Services Routers (ISR), which are designed for two distinct purposes.

Cisco’s ASR series are best suited for enterprises and service providers. They are the very ones for high-bandwidth applications like video streaming. The ASR series currently includes the ASR 900 Series, the ASR 1000 Series and the ASR 9000 Series.

Of the three series, the ASR 9000 Series is the highest-end router; it has core routing capabilities in addition to edge routing capabilities. The ASR 900 Series and ASR 1000 Series only have edge routing capabilities, but all of of the ASR series routers can handle up to 100G Ethernet.The ASR 9000 Series also uses different software from the other two series; it runs on IOS XR, whereas the ASR 900 Series and the ASR 1000 series run on IOS XE. Cisco’s IOS XR operating system is designed for Cloud-scale networking and allows for software image upgrades and module changes without impacting operations.

Cisco’s ISR series have edge routing capabilities and are primarily used by small businesses and branch offices that have small- or medium-sized networks. The ISR series of routers currently includes the ISR 800 Series, the ISR 1900 Series, the ISR 2900 Series, the ISR 3900 Series and the ISR 4000 Series.ISR routers provide reliable, secure branch office connectivity and a robust set of features that enable cloud computing, secure networking, multimedia performance, and mobile connectivity. The ISR series also use Cisco’s IOS operating system, as opposed to IOS XE or IOS XR. Since ISR series routers are made for less computing-intensive environments, they have a much smaller footprint than ASR series routers. The ISR series also have lower maximum Ethernet speeds; the higher-end router of the ISR series, the ISR 4000, supports up to only 10G Ethernet.

Although there are many things in common, there are also several key differences, which is ultimately more important when considering purchasing Cisco ASR versus ISR routers.

The biggest difference is that ASR routers are for enterprises and service providers, whereas ISR are for customers with small- or medium-sized networks. In general, because the ASR series are designed for large-scale applications, they have more features and higher performance levels compared with ISR routers. For example, ASR routers can handle faster Ethernet, they have a higher port density, and the ASR 9000 Series is the only router series that has core routing capabilities.

In terms of similarities, both Cisco ASR and ISR routers offer secure WAN connectivity. They have also both been approved to secure sensitive data when configured with the PSN Interim IPsec Profile. And, although the Cisco ASR 9000 series provides cloud access like all the Cisco ISR series, the other two ASR series do not grant cloud access.

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