1、故障概述
客户有一台Exadata X3-2，断电重启后，发现思科交换机无法访问，通过串口线登录思科交换机，发现思科交换机进入到了rommon模式。 本文主要记录该故障的处理过程。
2、故障处理
2.1 通过串口线登录思科交换机，发现思科交换机进入到了rommon模式，具体信息如下。
**********************************************************
* *
* Welcome to Rom Monitor for WS-C4948E-F System *
* Copyright (c) 2003-2013 by Cisco Systems, Inc. *
* All rights reserved. *
* *
**********************************************************
Checking the partition table and boot sector...
Checking FAT, Files and Directories...
Reclaiming unused space...
Updating FAT...
Primary Rom Monitor Version 12.2(44r)SG12
CPU Rev: 3.1, Board Rev: 8, Board Type: 105, CPLD Hobgoblin-f Rev: 22
Chassis: WS-C4948E-F
Front Panel Phy is Bcm5482s
Got Mac Address: a8:9d:21:98:4f:bf
MAC Address : a8-9d-21-98-4f-bf
Ip Address : Not set.
Netmask : Not set.
Gateway : Not set.
TftpServer : Not set.
Peer supervisor not detected or is not running IOS
Supervisor uplinks and all linecards have been reset
***** The system will autoboot in 5 seconds *****
Type control-C to prevent autobooting.
. . . . .
******** The system will autoboot now ********
config-register = 0xc442
Autobooting using BOOT variable specified file.....
Could not find a valid file in BOOT environment variable.
BOOT variable can be set from IOS. To find currently set
Rom Monitor variables, please type 'set' command.
For help on choosing a boot method, type 'confreg' command.
rommon 1 >
2.2 进入到rommon模式的原因可能是因为系统找不到boot系统文件，可以使用如下解决方案。
2.2.1#####输入set查看BOOT配置项
rommon 1 >set
PS1=rommon ! >
RommonVer=12.2(44r)SG12
SupportedFeatures=1
Fa1Enable=1
BootedFileName=bootflash:/cat4500e-ipbasek9-mz.150-2.SG9.bin
ConfigReg=0xc442
ConsecPostPassedCnt=39
DiagMonitorAction=Normal
BOOT=
RET_2_RTS=08:46:24 UTC Mon Jan 26 2026
RET_2_RCALTS=1769417185
可以看出，BOOT配置项当前为空，这就是系统无法启动的原因。
2.2.2#####查看设备下的bootflash文件
rommon 2 >dir bootflash:
File Size (Bytes) File Name
---------------------------------------
26758514 cat4500e-ipbasek9-mz.150-2.SG9.bin
Total space = 128165888 bytes, Available = 91387904 bytes
2.2.3#####重新指定bootflash设备名，之后系统正常启动
rommon 7 >boot bootflash:cat4500e-ipbasek9-mz.150-2.SG9.bin
2.2.4#####系统启动后，手动指定系统启动文件
Switch>enable
adm0#show running-config
adm0(config)# boot system bootflash:cat4500e-ipbasek9-mz.150-2.SG9.bin
adm0(config)#end
adm0# write memory
adm0#copy running-config startup-config
至此，故障得以解决。
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