故障现象一：
System Bootstrap, Version 8.4(2) Release
Copyright (c) 1994-2005 by cisco Systems, Inc.
Cat6k-Sup720/SP processor with 524288 Kbytes of main memory
Autoboot executing command: "boot bootflash:s72033-advipservicesk9_wan-mz.122-33.SXI2a.bin"
Loading p_w_picpath, please wait ...
Invalid device specified
Booting from default device
Initializing ATA monitor library...
string is bootdisk:s72033-adventerprisek9_wan-mz.122-33.SXI6.bin
Initializing ATA monitor library...
Self extracting the p_w_picpath... [OK]
Self decompressing the p_w_picpath : ###############################################################################################################]
%SYSTEM-1-INITFAIL: Network boot is not supported.
解决办法：
开机的时候按Ctrl-Break进入ROMmon模式
rommon 1 > boot disk0:s72033-advipservicesk9_wan-mz.122-33.SXI2a.bin
故障现象二：
Autoboot: failed, BOOT string is empty
Autoboot executing command: "boot "
解决办法：
rommon 1 >dev
rommon 2 >dir bootdisk:
rommon 3 > BOOT=bootdisk:s72033-advipservicesk9_wan-mz.122-33.SXI2a.bin
rommon 4 >boot
