Cisco Nexus 3000 Series switches are shipped with the Cisco NX-OS software preinstalled on the switches. Before upgrading or downgrading from an existing image, you should read through the information in this document to understand the guidelines, prerequisites, and procedures for upgrading the software. For updated information about the Cisco NX-OS software for the Cisco Nexus 3000 Series switch, see the Cisco Nexus 3000 Series Release Notes.
The Cisco NX-OS software consists of one NXOS software image. The image filename begins with "nxos" [beginning with Cisco NX-OS Release 7.0(3)I2(1) and later releases]. Only this image is required to load the Cisco NX-OS operating system. This image runs on all the Cisco Nexus 3000 and Nexus 3100 Series switches. Using fast-reload after the BIOS upgrade or using install all commands are the only supported methods of upgrading to Release 7.0(3)I2(1) and later releases.
Starting with Release 7.0(3)I2(1) and later releases, there is a single image for booting the Cisco Nexus 3000 Series platforms. The kickstart and system images are not required anymore. The single image binary now boots up on both Cisco Nexus 3000 and 3100 Series platforms and Cisco Nexus 9000 Series platforms. Due to single image binary, the following commands are updated: -
The fast-reload to Release 7.0(3)I2(1) is supported only from Release 6.0(2)U6(3a) or later releases, after the BIOS has been upgraded. Using fast-reload from Release 6.0(2)U6(3a) to Release 7.0(3)I2(1) without upgrading the BIOS will result in the switch not booting up.
If the switch was ordered new with 7.0(3)I2.x code or has had init system performed while running 7.0(3)I2.x code, an install all downgrade to 6.0(2)U6.x code will result in the device being stuck in the loader prompt with no access to the files on bootflash.