How long does it take to register the interface card if a switch is upgraded through ISSU

When the system software of an S series switch is upgraded through in-service software upgrade (ISSU), assume that the system software of the interface card has been updated to the flash memory, and the startup file and startup path have been configured. If the BootROM and Bootload before and after the version upgrade are the same, the interface card is started in fast startup mode. That is, the interface card is started using the configured startup file and path. It takes about 2 minutes to start and register the interface card. If the BootROM and Bootload before and after the version upgrade are different, the interface card is started in normal mode. In this mode, the BootROM and Bootload of the interface card are updated and the startup file is downloaded from the MPU. The whole process takes about 6 to 7 minutes.

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