用usb更新Cisco IOS 示例与命令，不需要用tftp
Using a USB flash drive to copy IOS to Cisco devices
A little background
Before we get started, let’s review some of the specifics you need to know about using USB flash and CF cards with Cisco routers.
- The Cisco IOS can only read FAT-formatted flash drives.
- The USB ports on a router are usually USB 2.0, but check the specifications
Ideally, USB flash can hold multiple copies of the Cisco IOS and multiple router configurations, and you can use it to easily move and copy those IOS files and configurations from router to router. And many times, when you’re physically at the router, the copying process can take place several times faster than it would over a LAN or WAN.
Let’s start
1>>> Take the USB flash drive from your pocket and connect it to the router. Immediately, the router told you like that:
*Feb 26 21:03:10.251: %USBFLASH-5-CHANGE: usbflash1 has been inserted! *Feb 26 21:03:10
原文地址：https://blog.csdn.net/hu5566798/article/details/136396797
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