Boot Sequence - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

Cli software configuration guide

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Boot Sequence

When the switch boots, the golden BIOS validates the checksum of the upgradeable BIOS. If the checksum

is valid, then control is transferred to the upgradeable BIOS image. The upgradeable BIOS launches the

kickstart image, which then launches the system image. If the checksum of the upgradeable BIOS is not valid,

then the golden BIOS launches the kickstart image, which then launches the system image.

You can force the switch to bypass the upgradeable BIOS and use the golden BIOS instead. If you press

Ctrl-Shift-6 within two seconds of when power is supplied to the switch, the golden BIOS will be used to

launch the kickstart image, even if the checksum of the upgradeable BIOS is valid.

When you press Ctrl-Shift-6, the console settings must be set to their defaults: 9600 baud, 8 data bits, no

parity, and 1 stop bit.

Before the boot sequence starts, the BIOS performs internal tests on the switch. If the tests fail, then the loader

does not gain control. Instead, the BIOS image retains control and prints a message to the console at 9600

baud every 30 seconds that indicates a failure.

The following figure shows the normal and recovery boot sequence.

Figure 5: Boot Sequence

Cisco Nexus 5000 Series Switch CLI Software Configuration Guide

Configuring the Switch

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