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If you can't get it with the mode button and you are using Putty you can also right-click on the header of the putty session as the switch is booting up and click on the option for Special-Commands and select Break. You will want to do this towards t...
As said here before, and the way I have done this is to stagger the replacements. So that your Active router is not disturbed. Should be pretty easy process.
Exactly like said before, this is normal behavior for a few pings to be lossed initially while the device is learning the MAC address in its ARP table.
