Cisco2500， 3000， AS5100和UBR900系列路由器的ROMmon恢复
Contents
Introduction
本文解释如何恢复Cisco2500， 3000，在ROMmon滞留的AS5100和UBR900系列路由器(rommon#>或>prompt)。
Prerequisites
Requirements
从ROMmon模式要恢复路由器，路由器应该是物理的可访问的，并且应该有终端被连接到控制台端口。恢复路由器从ROMmon通过telneting不是可能的对任何接口。您必须会从TFTP server复制Cisco IOS软件镜像到路由器。
Components Used
本文的信息根据：
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Cisco 2500 Series Router
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Cisco 3000 Series Router
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Cisco AS5100系列通用访问服务器
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Cisco uBR900系列路由器
本文档中的信息都是基于特定实验室环境中的设备创建的。All of the devices used in this document started with a cleared (default) configuration.如果您是在真实网络上操作，请确保您在使用任何命令前已经了解其潜在影响。
Conventions
有关文档规则的详细信息，请参阅 Cisco 技术提示规则。
验证配置寄存器值
需要调查的第一件事是路由器为什么在ROMmon模式启动(表示由“rommon- >”或" > "提示)。确定原因是否归结于配置寄存器值的更改，或者一个损坏的Cisco IOS软件镜像。
如果路由器有一个有效的Cisco IOS软件镜像，则更换配置值寄存器到0x2102将恢复路由器。此程序如下解释。
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如果ROMmon提示是“>”，请键入以下在ROMmon提示：
>o/r 0x2102 >i System Bootstrap, Version 11.0(10c)XB2, RELEASE SOFTWARE Copyright (c) 1986-2003 by cisco Systems 2500 processor with 16384 Kbytes of main memory F3: 10021772+224116+562960 at 0x3000060 Restricted Rights Legend Use, duplication,............................
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如果ROMmon提示是“rommon #>”，请键入以下在提示：
rommon 1> confreg 0x2102
您必须重置或供给循环动力新的配置的路由器能生效：
rommon 2> reset System Bootstrap, Version 12.0(6r)T3, RELEASE SOFTWARE (fc1) Copyright (c) 1999 by cisco Systems, Inc. UBR924 platform with 16384 Kbytes of main memory.......................
如果路由器顺利地启动，则原因是配置寄存器值问题。
如果路由器在ROMmon再启动，使用从简单文件传输协议(TFTP)服务器的启动镜像请进行对下载Cisco IOS镜像。
下载Cisco IOS镜像使用启动镜像从简单文件传输协议(TFTP)服务器
如果主Cisco IOS软件被删除了或毁损了，只有一种方式在2500， 3000， AS5100或者UBR900系列路由器上配置镜像。您必须使用其启动镜像。
因为您已经确定启动在ROMmon的路由器的原因不归结于配置寄存器值，唯一选择可用为恢复是从TFTP server重新安装或升级Cisco IOS软件使用内置的启动镜像(Rx-引导)在ROM。
要进入Rx-boot模式或启动镜像，请执行以下：
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如果ROMmon提示是“rommon- >”，请键入：
rommon 1 > confreg 0x2101
您必须重置或供给循环动力新的配置的路由器能生效：
rommon 2>reset System Bootstrap, Version 12.0(6r)T3, RELEASE SOFTWARE (fc1) Copyright (c) 1999 by cisco Systems, Inc. UBR924 platform with 16384 Kbytes of main memory.......................
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如果ROMmon提示是“>”，请键入：
>o/r 0x2101 >i System Bootstrap, Version 11.0(10c)XB2, RELEASE SOFTWARE Copyright (c) 1986-1994 by cisco Systems 2500 processor with 16384 Kbytes of main memory Restricted Rights Legend Use, duplication, or ................ !--- Output suppressed .............16384K bytes of processor board System flash (Read/Write) Press RETURN to get started! hostname(boot)>
注意提示当前是“路由器(引导程序) >”，确认使用启动镜像，路由器启动。
Note: 如果路由器在ROMmon再启动，很可能启动镜像已损坏或丢失，并且恢复的唯一方法是通过更换处理器板系统闪存或硬件。
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下一步是升级Cisco IOS软件如下：
hostname(boot)>enable hostname(boot)#copy tftp flash System flash directory: File Length Name/status 1 2416128 c2500-is-l.123-1a.bin [invalid checksum] [2416192 bytes used, 14361024 available, 16777216 total] Address or name of remote host [255.255.255.255]? 172.16.1.2 Source file name? c2500-is-l.123-1a.bin Destination file name [c2500-is-l.123-1a.bin]? Accessing file 'c2500-is-l.123-1a.bin' on 172.16.1.2... Loading c2500-is-l.123-1a.bin from 172.16.1.2 (via Ethernet0): ! [OK] Erase flash device before writing? [confirm] !--- Press Enter to confirm Flash contains files. Are you sure you want to erase? [confirm] !--- Press Enter to confirm Copy 'c2500-is-l.123-1a.bin' from server as 'c2500-is-l.123-1a.bin' into Flash WITH erase? [yes/no]yes Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ee ...erased Loading c2500-is-l.123-1a.bin from 172.16.1.2 (via Ethernet0): !!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !--- Output suppressed !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! [OK - 16294764/16777216 bytes] Verifying checksum... OK (0x96AA) Flash copy took 0:08:23 [hh:mm:ss] hostname(boot)#
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请使用show flash命令验证加载Cisco IOS镜像版本。
hostname(boot)#show flash System flash directory: File Length Name/status 1 16294764 c2500-is-l.123-1a.bin [16294828 bytes used, 482388 available, 16777216 total] 16384K bytes of processor board System flash (Read/Write) hostname(boot)#
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在成功复制对路由器的Cisco IOS镜像以后，请切记您更改配置寄存器回到0x2102并且重新载入路由器从Cisco IOS镜像引导。
hostname(boot)(config)#config-register 0x2102 hostname(boot)#reload System configuration has been modified. Save? [yes/no]: no Proceed with reload? [confirm] !--- Press Enter to confirm *Mar 1 00:12:58.463: %SYS-5-RELOAD: Reload requested System Bootstrap, Version 11.0(10c)XB2, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1) Copyright (c) 1986-2003 by cisco Systems 2500 processor with 14336 Kbytes of main memory F3: 15405292+889440+952984 at 0x3000060 !--- Output suppressed Press RETURN to get started! hostname> -
请使用show version命令验证配置寄存器值和加载Cisco IOS镜像版本。
hostname>show version Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(1a), RELEASE SOFTWARE (fc1) Copyright (c) 1986-2003 by cisco Systems, Inc. Compiled Fri 06-Jun-03 07:46 by dchih Image text-base: 0x0307F6E8, data-base: 0x00001000 ROM: System Bootstrap, Version 11.0(10c)XB2, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1) BOOTLDR: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c)XB2, PLATFORM SP ECIFIC RELEASE SOFTWARE (fc1) Router uptime is 2 minutes System returned to ROM by reload System image file is "flash:c2500-is-l.123-1a.bin" cisco 2500 (68030) processor (revision L) with 14336K/2048K bytes of memory. Processor board ID 13587050, with hardware revision 00000000 Bridging software. X.25 software, Version 3.0.0. 2 Ethernet/IEEE 802.3 interface(s) 2 Serial network interface(s) 32K bytes of non-volatile configuration memory. 16384K bytes of processor board System flash (Read ONLY) Configuration register is 0x2102
以上的show version命令的输出表示，路由器装载了新的Cisco IOS镜像，并且配置寄存器值是0x2102。
请参阅软件安装和升级流程关于1600， 2000， 2500， 3000， AS5100和AS5200欲知更多信息。
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