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如果你不小心使用了命令erase flash 那么发生什么就可想而知了。因此，建议在你拿到路由器等网络设备时 最好先将它的IOS等操作系统备份出来，以备万一！
本篇主要介绍通过Xmodem上传IOS的过程（以Cisco 2610为例，不过这个方法用在其他设备上没什么太大区别）准备工作，只要有Cisco原配的线缆就可以（注：Xmodem与实际的modem没有任何联系 只是一个传输协议 数据是通过终端的串口和路由器的Console口灌进去的）
在没有IOS的情况下 系统只能进入Rommon状态，在这个状态下只能见到如下命令：
| rommon 8 > ? alias set and display aliases command boot boot up an external process break set/show/clear the breakpoint confreg configuration register utility cont continue executing a downloaded image context display the context of a loaded image cookie display contents of cookie PROM in hex dev list the device table dir list files in file system dis display instruction stream dnld serial download a program module frame print out a selected stack frame help monitor builtin command help history monitor command history meminfo main memory information repeat repeat a monitor command reset system reset set display the monitor variables stack produce a stack trace sync write monitor environment to NVRAM sysret print out info from last system return tftpdnld tftp image download unalias unset an alias unset unset a monitor variable xmodem x/ymodem image download 在这个模式下，输入Xmodem rommon 9 > xmodem 会提示如下警告： WARNING: All existing data in bootflash will be lost! Invoke this application only for disaster recovery. Do you wish to continue? y/n [n]: y Ready to receive file ? ... |
然后在超级终端的传送栏目=> 选择发送选项 => 再选择Xmodem 并指明IOS所在的路径即开始上传IOS，等待时间很长，视IOS的大小和传输速度。对于初次做IOS上传，建议不要去修改什么传输速率。传完以后 对整个系统初始化 界面如下：
| Erasing flash at 0x603c0000 program flash location 0x602f0000 Download Complete! program load complete, entry point: 0x80008000, size: 0x2f0074 Self decompressing the image : ################################################# ################################################################################ ################################################################################ ################################################################# [OK] Restricted Rights Legend Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) of the Commercial Computer Software - Restricted Rights clause at FAR sec. 52.227-19 and subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at DFARS sec. 252.227-7013. cisco Systems, Inc. 170 West Tasman Drive San Jose, California 95134-1706 Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-I-M), Version 11.3(6)T, RELEASE SOFTWARE (fc1) Copyright (c) 1986-1998 by cisco Systems, Inc. Compiled Tue 06-Oct-98 18:42 by ccai Image text-base: 0x80008084, data-base: 0x80554578 cisco 2610 (MPC860) processor (revision 0x202) with 12288K/4096K bytes of memory . Processor board ID JAB0233005Z (3677578902) M860 processor: part number 0, mask 32 Bridging software. X.25 software, Version 3.0.0. 1 Ethernet/IEEE 802.3 interface(s) 1 Serial network interface(s) 32K bytes of non-volatile configuration memory. 4096K bytes of processor board System flash (Read/Write) Press RETURN to get started! 00:00:06: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up 00:00:06: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up 00:00:06: %SYS-5-CONFIG_I: Configured from memory by console 00:00:06: %SYS-5-RESTART: System restarted -- Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-I-M), Version 11.3(6)T, RELEASE SOFTWARE (fc1) Copyright (c) 1986-1998 by cisco Systems, Inc. Compiled Tue 06-Oct-98 18:42 by ccai 00:00:07: %LINEPROTO-5-UPDOWN: Line protocol on WL_bank_2610_2>Interface Ethernet0/0, changed state to up 00:00:07: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed sta te to up 00:00:07: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed sta te to up 2610_2> |
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