Q：中端路由器(1.74-0105版本)不能正常删除配置是何原因?
A：中端路由器1.74-0105版本的清除配置和重新启动命令增加了新的选项，如果对细节不太注意，容易造成明明执行了delete命令，但reboot后发现原来的配置还存在的现象，例如，下面的操作：
[Router]delete
This will erase the configuration in NVRAM.
The router configurations will be erased to reconfigure
Are you sure?[Y/N]y
Now erasing the configuration in nvram.
Please wait for a while......
Erase the configuration in NVRAM successfully
Please reboot the router
[Router]reboot
WARNING: Configuration has been changed ! Save configuration ? [Y/N]y
Now writing the running config to nvram .
Please wait for a while......
write the running config to nvram successfully
WARNING: System will REBOOT! Continue ?[Y/N]y
System is now rebooting, please wait
在重新启动的时候，系统会提示是否保存配置，如果这时选了yes，重起后配置是依然存在的。如果在这一步选择no，就没有问题了。