思科认证:对恢复CISCOIOS路由器源文件

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思科认证:对恢复CISCOIOS路由器源文件
教你如何恢复CISCOIOS路由器源文件
; M8 v1 e/ n* d- |& F7 i+ X6 u8 C/ Q　　如果您的路由器的flash因为意外丢失了IOS，您可以在ROM monitor commands模式下通过如下两种办法恢复：1) xmodem—Use this if the computer attached to your console has a terminal emulator that has xmodem capability.
　　2) tftpdnld—Use this if you have a TFTP server directly connected to the Ethernet 0 port.Using the xmodem Command
: m7 F3 {/ h+ ?0 ]　　The xmodem command establishes a connection between a console and the router console port for disaster recovery if both the boot and system images are erased from Flash memory.
　　xmodem [filename]—Establishes an xmodem connection between the console and the router. The optional parameter filename specifies the source file containing the Cisco IOS image.
　　Other options include the following：
. C  ~$ J0 E9 D# q- j' F9 c　　·-c—use cyclic redundancy check (CRC-16)
　　·-y—use Ymodem transfer protocol
, ~$ N1 M. V! S* I! X7 `　　·-r—copy the image to DRAM for launch
* t! `9 Z' E9 I　　·-x—do not launch image on completion of downloadUsing the tftpdnld Command
　　The tftpdnld command downloads a Cisco IOS software image from a remote server into Flash memory using TFTP.
' {1 W9 Q' A5 k* \5 [　　tftpdnld—Begins the TFTP copy command.
. M% `/ X3 I2 }: V" S　　The following variables are required：
　　·IP_ADDRESS—The IP address for the router you are using.
　　·IP_SUBNET_MASK—The subnet mask for the router you are using.
　　·DEFAULT_GATEWAY—The default gateway for the router you are using.
) I+ W/ o3 D5 v) x, f/ n7 X& g　　·TFTP_SERVER—The IP address of the server from which you want to download the image file.
　　·TFTP_FILE—The name of the file that you want to download.
　　·The following variables are optional：
　　·TFTP_VERBOSE—Print setting. 0=quiet， 1=progress， 2=verbose. The default is 1.
. @' u( Y$ G- g　　·TFTP_RETRY_COUNT—Retry count for ARP and TFTP. The default is 7.
$ |9 c6 \" a! {- J　　·TFTP_TIMEOUT—Overall timeout of the download operation in seconds. The default is 2400 seconds.
- f  C$ ]9 `& g4 s　　·TFTP_CHECKSUM—Performs a checksum test on the image. 0=no， 1=yes. The default is 1.
　　The syntax for specifying the variables is：
　　VARIABLE_NAME=valueAfter you specify the variables， you must reenter the tftpdnld command. For example：
　　rommon 1 》 tftpdnldrommon 2 》 IP_ADDRESS=172.15.19.11rommon 3 》 IP_SUBNET_MASK=255.255.255.0rommon 4 》 DEFAULT_GATEWAY=172.15.19.1rommon 5 》 TFTP_SERVER=172.15.20.10rommon 6 》 TFTP_FILE=/tftpboot/c2600-i-mzrommon 7 》 TFTP_VERBOSE=1rommon 8 》 tftpdnld
　　IP_ADDRESS=172.15.19.11
& m# d0 H) S2 A( }3 l/ V( d+ {　　IP_SUBNET_MASK=255.255.255.0
　　DEFAULT_GATEWAY=172.15.19.1
　　TFTP_SERVER=172.15.20.10
* x8 O! `/ r: b3 {& X　　TFTP_FILE=/tftpboot/2600-i-mz
　　TFTP_VERBOSE=1Invoke this command for disaster recovery only.
) A7 q0 {" o# V' i2 v　　WARNING： all existing data in flash will be lost!
( ]  s) T( r0 {) i/ v. R5 ^6 [　　Do you wish to continue？ y/n： [n]：Enter y to begin downloading the Cisco IOS software image. When the process is complete， the ROM monitor mode prompt displays on your screen.