Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages wha2tsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
The high end of the ISR 4400 series, can handle 1 to 2 Gbps, but if you want to invest in additional capacity, the entry models in the ASR 1000 series should serve your needs. (NB: with some of the entries ASR 1000 series, you can also support 10g.)
Recommending a L3 switch is tougher because they are more for oriented for specific needs and performance ranges. You only mentioned Cloud DC, L3 and backbone; not much to narrow down a recommendation. For DC usage, Cisco has their Nexus line. For (a small) backbone, perhaps something in the 4500 or 4900 families. Both lines/families have devices that support L3.
