Acer AB460 F1 User Manual - Page 351

331 The interface numbers change between stacking and non-stacking cases due to the switch ID. So configurations saved for stacking are not valid for non-stacking cases and vice versa. Note: If you choose stacking using the stack command from a non-stacking case, and the configurations are already saved for restoring the switch, it will rename the configuration file by adding a suffix _nonstack and will not restore this file when the switch reboots with stacking enabled. Similarly, if you choose non-stacking using the no stack command from the stacking case, and the configurations are already saved for restoring the switch, it will rename the configuration file by adding a suffix _stack and will not restore this file when the switch reboots with stacking disabled. Adding Stacking Members Connect the stacked switches using stacking cables. For better redundancy, connect the switches daisy-chained. This chain connectivity helps to maintain stacking in case a single link or switch fails. Before connecting switches in stacking, make sure stacking is enabled in all switches and that the switch identifier and priorities are all configured properly. There is no other specifical configuration required to add stacked switches. If two stacking-enabled switches connect through stacking cables, they form a stack. Note: Do not use the same switch ID for multiple switches on the stack.