Although netbooting is useful, network or server failures can make netbooting impossible. After you have installed and configured the router's Flash memory, configure the boot sequence for the router to reduce the impact of a server or network failure. The following order is recommended:
1 Boot an image from Flash memory.
2 Boot an image using a netboot.
3 Boot from a ROM image.
Following is an example of how to configure a router with a fault-tolerant boot sequence.
goriot# configure terminal
Enter configuration commands, one per line. End with CNTL/Z. goriot(config)# boot system flash gsxx goriot(config)# boot system gsxx 18.104.22.168
goriot(config)# boot system rom goriot(config)# ^Z
%SYS-5-CONFIG_I: Configured from console by console goriot# copy running-config startup-config
Using this strategy, a router has three sources from which to boot: Flash memory, netboot, and ROM. Providing alternative sources can help to mitigate any failure of the TFTP server or the network.
Note The configuration register must be set to allow ROM image booting after failed netbooting attempts. For more information, refer to the hardware configuration manual for your platform.
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