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Thanks both to you and to Luis Contreras for sharing and producing this document. I love it when a problem, solution, and validation is so neatly wrapped up like this.
In addition to Padma's reply, here's a video to regenerate the keyring. To answer your follow-on question, it is non-disruptive to the data plane but will interrupt GUI access for a short time.https://video.cisco.com/detail/video/6329512500112