What is the maximum speed of Cisco 1921?

Question

Cisco

Good day, there are 1921 cats. Declared throughput of 1 Gb / s, but in fact 300 Mbps. (Uplink is gigabit, with a household archer it holds 800 mb/s, and here even in !!!local network!!! from host to host 300 mbps). Somewhere out of the corner of my eye I saw that I needed a license "for speed". Well, actually the question is, where to dig to achieve 1 Gb / s? Or 1 Gb / s is this total bandwidth of all interfaces and can no longer be squeezed out?
Thanks in advance!

Answer 1

The test according to RFC2544 shows the maximum throughput of this piece of iron at 2770Mbps. But there are nuances :) This is an NDR (no drop rate) test only for forward packets of a fixed size of 1500 bytes. In fact, the performance of the processor, which is not busy with anything else but the forward. And under the same conditions - NDR, only forwarding, fixed-size packets - but with 64-byte packets, it also shows less than 200Mbps. This doesn't happen in real life.
Cisco declares 15Mbps for this router (that is, 30Mbps aggregated, duplex). As usual, Cisco declarations are always very conservative, but you should only rejoice with your 300Mbps.
There are no "speed licenses".