Why does an S series switch have at least one MPU installed

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An S series modular switch must be configured with at least one MPU. Otherwise, the switch is unable to work normally.

Other related questions:
Status of MPUs on S series switches
You can run the display device command on an S series switch to check the running status of a card.

MPU types on S series modular switches
Different S series switches have different MPUs: S9303: LE0MMCUA and LE0DMCUA S9306&S9312: LE0MSRUA, LE0DSRUA, LE0D00SRUB00, LE1D2SRUE000, and LE1D2SRUH000 S9310: LE1D2SRUKC00 S7703: ES0D00MCUA00 and ES1D2MCUAC00 S7706&S7712: ES0D00SRUA00, ES1D2SRUAC00, ES0D00SRUB00, ES1D2SRUE000, and ES1D2SRUH000 S9703: EH1D2MCUAC00 S9706&S9712: EH1D2SRUDC00, EH1D2SRUC000, and EH1D2SRUDC01 S12704&S12708&S12712: ET1D2MPUA000 S12710: ET1D2MPUBC00

Does an S series switch with dual MPUs need to synchronize the configuration file between the dual MPUs
For an S series modular switch with dual MPUs, you need to run the copy command to synchronize the configuration file from the master MPU to the slave MPU when performing device upgrade or active/standby switchover operations. The slave MPU does not automatically synchronize the configuration file from the master MPU.

Usage of CLK ports on the MPU of S series switches
The CLK1 and CLK2 ports on the MPU correspond to the BITS0 and BITS1 ports on the clock card. BITS ports are connected to BITS devices or connected to BITS ports of other products to synchronize the time and clock.

Why does an S series switch have a (*,G) entry and an (S,G) entry in the multicast routing table
It is normal that each multicast group has two entries on an S series switch. For ASM multicast services, the (*,G) entry is generated when a switch receives a user request to join the multicast group, and the (S,G) entry is generated when the switch receives multicast data packets for the multicast group. The outbound interface in the (S,G) entry is obtained from the (*,G) entry.

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