Netgear XCM8806 Chassis Hardware Installation Guide - Page 1314

NETGEAR 8800 Chassis Switch CLI Manual active, by issuing the use image command and rebooting the switch, the module is also activated at boot time. To install a module to the active partition, use the download image command to download the module to the active partition, and use the ? command to install it, if you did not choose to install when the image was downloaded. Remember, the core image on the active partition must be of the same version as the module. If you reboot the switch, the module will also be activated, but you can activate the module without rebooting the switch by issuing the run update command. After issuing that command, all the functionality, and command line interface (CLI) commands, of the module will be available. Performing a Hitless Upgrade Hitless upgrade is a mechanism that allows you to upgrade the NETGEAR 8800 software running on the switch without taking the switch out of service. Some additional benefits of using hitless upgrade include: • Minimizing network downtime • Reducing the amount of traffic lost Although any method of upgrading software can have an impact on network operation, including interrupting Layer 2 network operation, performing a hitless upgrade can decrease that impact. You must have two MSMs installed in your switch to perform a hitless upgrade. With two MSMs installed in the switch, one assumes the role of primary and the other assumes the role of backup. The primary MSM provides all of the switch management functions including bringing up and programming the I/O modules, running the bridging and routing protocols, and configuring the switch. The primary MSM also synchronizes its configurations with the backup MSM which allows the backup to take over the management functions of the primary. Note: If you download an image to the backup MSM, the image passes through the primary MSM before the image is downloaded to the backup MSM. To perform a hitless upgrade, do the following: 1. View current switch information using the following command: show switch Determine your selected and booted partition, verify which MSM is the primary and which is the backup, and confirm that the MSMs are synchronized. Output from this command indicates, for each MSM, the selected and booted images and if they are in the primary or the secondary partition. The selected image partition indicates which image will be used at the next reboot. The booted image partition indicates the image used at the last reboot. It is the active partition. 1314 | Appendix A. Configuration and Image Commands