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OMG, this JUST happened to me (I know it's over a year later). Absolutely routine 4451-X upgrade (although I went from an older code to a recent code, 16.12.5 to 17.09.05) and the router didn't recover, and its redundant neighbor showed the name Rou...
Much appreciated for this response. I stumbled upon the same problem, and it was my console cable as well. I even replaced that cable with an identical cable and the 2nd one worked while the first did not. This one had me stumped for a bit. Thank...