How to identify the master switch of a stack before logging in to the switch

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The S2750, S5700, S6700 and S3700-PWR provide an indicator mode setting button. Press this button on a switch to set the indicator mode to stack. If at least one interface indicator blinks, the switch is the master switch.

Other related questions:
Check the Stack ID of a switch through indicators
For the S2700, S3700, S5700SI, S5710-X-LI, S5720SI, S5720S-SI, S5700EI, S5700HI, S6720EI, and S6700EI, after the more switching button on the front panel of a switch is pressed and turns red, the port indicators on the front panel indicate the stack ID of the switch. For other models, after the mode switching button on the front panel of a switch is pressed, the port indicators on the front panel indicate the stack ID of the switch. For non-master switches: Switch with the stack ID ranging from 1 to 8: The sequence number of the port indicator that is steady on indicates the stack ID of the switch. For example, if the first port indicator is steady on, the stack ID is 1. If the second port indicator is steady on, the stack ID is 2. Switch with stack ID 0: The number of port indicators that are steady on indicates the number of member devices supported by the product. For example, if the first nine port indicators are steady on, the product supports nine member switches in a stack, and the stack ID of the local switch is 0. For the master switch: The stack ID indicator is blinking. The method to check the stack ID on the master switch is the same as that used on non-master switches.

Will the configuration of the standby switch of a stack of S series fixed switches be deleted when the master switch fails
After S series fixed switches set up a stack, the stack uses the configuration of the master switch, and the master switch synchronizes its configuration to the standby switch. If a fault occurs on the master switch and the master switch restarts, the standby switch becomes the new master switch. The stack uses the configuration file of the new master switch, but the configuration of the stack does not change.

How to identify a combo port on a switch
You can use the following methods to identify a combo port on a switch: Identify a combo port based on the interface identifier on the switch panel. If two ports have the same ID but connect to different transmission media, the two ports are multiplexed as a combo port. Run the display interface command to display the combo port. display interface gigabitethernet 0/0/1 ... IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 0025-9e80-2494 Port Mode: COMBO AUTO Speed : 100, Loopback: NONE ... You can run the combo-port command to set the working mode of a combo port. COMBO AUTO: The combo port automatically selects the working mode. FORCE FIBER: The combo port is configured to work as an optical port. FORCE COPPER: The combo port is configured to work as an electrical port.

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