Why do two modular switches have the same MAC address

Each MPU of a switch has a default MAC address. When two MPUs are installed on SwitchA to function as the active and standby MPUs, the standby MPU will automatically use the MAC address of the active MPU as its own MAC address. When the standby MPU is removed from SwitchA and then installed on SwitchB to function as the active MPU of SwitchB, the MAC addresses of SwitchA and SwitchB become the same. You need to restore the default MAC address of the active MPU on SwitchB.

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