We have about 50 branch offices -- none of which have more than a 1G internet connection. In fact, most are in the 50mb to 100mb range, which is anemic for the number of users we have (dozens to 100s).
We currently have a topology where each office has a L3 router (usually a C3850 or 2960XR) and a stack or several stacks of L2 C3850s or 2960X. Offices are connected via MPLS to our main DCs which are also our main internet access drains for all offices. Classic hub and spoke. In the offices, we use basic routes (some static) to our ISP. We also use QOS extensively.
One of my colleagues is suggesting that we start deploying ISRs -- in both our DC as well as our branch offices. I am worried that the 100mb-2gb speeds are going to be a problem. I am especially worried that once we turn on QOS the ISRs will choke. I'd rather invest in ASRs or maybe try to squeeze by with C9300s. At least the C9300s do more of the work in hardware. However, I can't tell if ACLs and QOS are done in hardware or software/CPU by the C9300s. Also not sure about the ASRs. But from what I can tell the ISRs are basically all software/x86 CPU.
Thoughts?
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