NHRP-based interface state control is a fantastic feature that you can use for faster convergence of very large DMVPN networks (as explained in the DMVPN Designs webinar, you can also use it to solve some interesting backup scenarios). We tested it in a network with over 1000 spokes (using ASR1K as the hub router) using very short registration timeouts, and the CPU utilization of the NHRP process rarely exceeded a few percents.
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