Bug: CSCuj18375
Cisco wants me to do a "write erase boot" which seems a bit silly.
Why not do this:
copy startup-config bootflash:startup-config.txt
config
feature scp-server
end
Go to server, scp the file down
remove the line with the garbage v6 address
scp the file back up to the switch
copy bootflash:startup-config.txt startup-config
show startup-config | begin mgmt
v6 address line is gone
reload