ASR9901 Specific Hardware Overview

References:
https://www.ciscolive.com/global/on-demand-library/?search=BRKARC-2003#/session/1486155287221001AsSr

The Cisco ASR9901 codename "Starlord" is a fixed 2u router with no support for any MPAs. It has 2x 100G QSFP28 ports, 24x dual rate 10G/1G SFP+ ports and 16x 1G SFP ports. The ASR9901 has two Tomahawk NPUs, it "looks like" the 2x100G and 16x1G ports use one NPU and the 24x 10G/1G ports use the other NPU. Tomahawk NPUs are rated for 240Gbps, 2x240Gbps == 480Gbps. However, the ASR9901 "only" has 456Gbps of port capacity so the box should be able to reach full line rate across all ports simultaneously.

The ASR9901 supports the 64-bit version of IOS-XR "eXR" only.

The ASR9901 supports front to back air flow, redundant power and fan trays. The "downside" is that the power consumption is typically in the 1200W range.