思科3800路由器进入rommon模式怎么办呢.出现这个问题一般是因为IOS被删了。
解决方法：
1、准备工具 -IOS文件 -TFTP软件，下载地址：http://vdisk.weibo.com/s/DiFYT -网线 -电脑IP配为跟路由器同一网段，本例中为：1.1.1.2
2、操作步骤（rommon右边的数字不用管）
rommon 19> IP_ADDRESS=1.1.1.1 //故障机的IP
rommon 20> IP_SUBNET_MASK=255.255.255.0 //掩码
rommon 21> TFTP_SERVER=1.1.1.2 //TFTP服务器的IP，就是电脑的IP
rommon 22> TFTP_FILE=c3845-spservicesk9-mz.124-12c.bin //IOS的文件名
rommon 30> DEFAULT_GATEWAY=1.1.1.2 //这个不配好像会有点问题，建议配上。
rommon 34> set //查看配置
PS1=rommon !> CRASHINFO=flash:crashinfo_20080426-202103 BOOT= WARM_REBOOT= RET_2_RTS=19:27:14 UTC Sat Oct 6 2012 BSI=0 RET_2_RCALTS= RANDOM_NUM=1461179899 IP_ADDRESS=1.1.1.1
IP_SUBNET_MASK=255.255.255.0
TFTP_SERVER=1.1.1.2
TFTP_FILE=c3845-spservicesk9-mz.124-12c.bin
DEFAULT_GATEWAY=1.1.1.2 ?=0
rommon 35>
rommon 35> tftpdnld //把IOS上传到故障机。
IP_ADDRESS: 1.1.1.1
IP_SUBNET_MASK: 255.255.255.0
DEFAULT_GATEWAY: 1.1.1.2
TFTP_SERVER: 1.1.1.2
TFTP_FILE: c3845-spservicesk9-mz.124-12c.bin **GE_PORT: Ge0/0 //默认是使用G0/0**。
TFTP_MEDIA_TYPE: Copper GE_SPEED_MODE: Auto Invoke this command for disaster recovery only. WARNING: all existing data in all partitions on flash will be lost! **Do you wish to continue? y/n: [n]: y //输入Y** Mac Address: 0015.c666.bc70 Receiving c3845-spservicesk9-mz.124-12c.bin from 1.1.1.2 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! File reception completed. Copying file c3845-spservicesk9-mz.124-12c.bin to flash. program load complete, entry point: 0x8000f000, size: 0xc0c0 Initializing ATA monitor library....... Format: All system sectors written. OK... Format: Operation completed successfully. Format of flash: complete program load complete, entry point: 0x8000f000, size: 0xc0c0 Initializing ATA monitor library.......
rommon 36>
rommon 37> reset //重启机器就OK了。
