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

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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.

Other related questions:
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.

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.

After a stack of S series fixed switches splits, the split stacks merge. Do I need to power off the master and standby switches
You do not need to power off the master and standby switches when stacks of S series fixed switches merge. You are advised to add a new switch to a stack during service idle time. Power off the new switch, configure the stack function on the switch, connect stack cables, and then power on the switch.

Clusters or stacks of S series switches
A stack or cluster of S series switches is a logical switch consisting of multiple stacking-capable or clustering-capable S series switches. In V200R001C00 and earlier versions, S series switches only set up stacks. In later versions, S series fixed switches set up stacks, and S series modular switches set up clusters. Please ask questions about specific switch models. The following information is possibly related to your question:

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