Netgear FSM726v3 7000 Series Managed Switch Administration Guide for Software - Page 354

NETGEAR Managed Switches Software Administration Manual, Release 8.0 Dual Image Traditionally switches contained a single image in the permanent-storage. This image is loaded into memory every time there is a reboot. Dual Image feature allows switches to have two images in the permanent storage. User can denote any of these images as an active-image that will be loaded in subsequent reboots and the other image as a backup-image. This feature provides for reduced down-time for the switches, when the firmware is being upgraded or downgraded. The images are stored in the file system with the file names image1 and image2. These names are used in the CLI, Web and the SNMP interfaces. Each of the images can be associated with a textual description. Switch provides commands to associate/retrieve text description for an image. A switch also provides commands to activate the backup image such that it is loaded in subsequent reboots. This activation command makes the current active image as the backup image for subsequent reboots. On three successive errors executing the active-image, the switch attempts to execute the backup-image. If there are errors executing the backup-image as well, the bootloader will invoke the boot menu. The Dual Image feature works seamlessly with the Stacking feature. All members in the stack must be uniform in their support for the DualImage feature. The Dual Image feature works in the following way in a Stack. • When an image is activated, the Management node notifies all the participating nodes. All nodes activate the specified image. • When any node is unable to execute the active-image successfully, it attempts to execute the backup- image, as mentioned in the section above. Such cases will require user intervention to correct the problem, by using appropriate stacking commands. CLI: Downloading a Backup Image and Having It Active (Netgear Switch) #copy tftp://192.168.0.1/gsm73xxseps.stk image2 Mode TFTP Set Server IP 192.168.0.1 Path Filename gsm73xxseps.stk Data Type Code Destination Filename image2 Management access will be blocked for the duration of the transfer Are you sure you want to start? (y/n) y 17-8 v1.0, October 2009 Tools