Which serial number is needed to renew the maintenance service of S series switches

Serial numbers of S series switches fall into two categories:
- Equipment serial number (ESN): indicates the serial number of a switch. The ESN of a modular switch is also called the chassis serial number.
- Serial number (SN) of each component: indicates the serial number of a card, subcard, optical module, power supply, or fan module.
An SN is required to renew the maintenance service for a switch. For all the components on the switch, provide the ESN of the switch. For one component, provide the SN of this component.

Other related questions:
How to view the serial number of an S series switch
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