Identify the master and standby switches in a stack of S series switches

You can identify the master and standby switches in a stack of S series switches using either the CLI or indicator method.

1. CLI
Run the display stack command to check the stack information, including the stack topology, roles of stack member switches, MAC address, and priority.

2. Indicators
Press the MODE button on any member switch to change the mode status indicator to the stack mode. You can determine the stack IDs of the master switch and member switches through the status of service port indicators.
Note:
a. On an S5700EI, S5700SI, S5710-C-LI, S6700, or S5700HI switch, the stack mode status indicator shows the stack and speed modes. After you press the MODE button, the indicator is steady red and off after 45 seconds, indicating that the switch enters the stack mode.
b. The S2720, S2750, S5700-LI, S5710-X-LI, S5710EI, S5720SI, S5720S-SI, and S6720EI switches have an independent stack mode indicator (STCK indicator). After you press the MODE button, the indicator is steady green or blinking, and then off in 45 seconds, indicating that the switch enters the stack mode.

If the service port indicator is steady green, the member switch is a non-master switch. If the service port indicator blinks green, the member switch is the master switch.
a. If the indicator of a port is steady on or blinking, the number of this port is the stack ID of the switch.
b. If the first nine port indicators of a switch are steady on or blink, the stack ID of the switch is 0.
To identify the standby switch, run the display stack command to check the stack ID of the standby switch and then check the status of the service port indicators.

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