从ROMMON模式恢复Catalyst 9800控制器

简介

本文档介绍如何基于ROMMON模式恢复Catalyst 9800控制器，且闪存中没有镜像。

先决条件

要求

Cisco 建议您了解以下主题：

• Catalyst无线控制器9800

使用的组件

本文档中的信息基于以下软件和硬件版本：

• Catalyst 9800版本16.10.1

本文档中的信息都是基于特定实验室环境中的设备编写的。本文档中使用的所有设备最初均采用原始（默认）配置。如果您的网络处于活动状态，请确保您了解所有命令的潜在影响。

配置

虚拟9800 (9800-CL)的密码恢复流程

步骤1:重新启动9800-CL。您会快速看到启动选择屏幕：

第二步：在此屏幕上按C以获取grub提示符。

第三步：在该提示符下，可使用config 0x2142命令更改配置寄存器。

第四步：按ESC键返回引导选择提示符，然后选择 packages.conf以在普通映像上引导。

第五步：无需配置即可启动WLC。恢复它。

第六步：不要忘记重复步骤1中的步骤，将配置寄存器重新设置为原始值0x2002，以便在重新启动时保存并加载配置。

通过ROMMON的设备密码恢复过程

步骤1:在加载映像的系统控制台上看到#####被打印时，请发送break键。然后，系统将中断启动过程并转到ROMMON提示符。按键盘上的break或ctrl+break时，您可以执行此操作。您还可以从终端程序发送中断(例如，Putty Special Command > Break、Teraterm Control > Send Break)。

警告：在运行早于16.12(3r)的ROMMON的9800-L上，配置寄存器的此位可防止闯入ROMMON进行密码恢复。
修复：如果运行较旧的ROMMON，请升级ROMMON，详细说明请参见Upgrade Field Programmables for Cisco Catalyst 9800-L无线控制器
解决方法：如果无法完成升级，请将config-register修改为0x2002作为解决方法并防止锁定ROMMON。

File size is 0x01d191f3 Located C9800-rpboot.16.10.01.SPA.pkg Image size 30511603 inode num 874837, bks cnt 7450 blk size 8*512 ################################################################################ ################################################################################ ################################################################################ ########################################################## Boot image size = 30511603 (0x1d191f3) bytes ROM:RSA Self Test Passed ROM:Sha512 Self Test Passed Package header rev 3 structure detected Calculating SHA-1 hash...done validate_package_cs: SHA-1 hash: calculated e36f46af:2c06b38d:eeb6e65b:ffaeb429:a6982d29 expected e36f46af:2c06b38d:eeb6e65b:ffaeb429:a6982d29 Validating main package signatures monitor: command "boot" aborted due to user interrupt rommon 1 > 

步骤2.在ROMMON提示符下，使用confreg 0x2142命令将配置寄存器更改为0x2142。



rommon 1 > confreg 0x2142 You must reset or power cycle for new config to take effect 

第三步：要保存rommon配置更改，请在rommon提示符处执行sync ，将rommonreset  更改为applied change from rommon提示符。



rommon 2 > sync rommon 3 > reset Resetting ....... Initializing Hardware ... System integrity status: 90170200 12030107 System Bootstrap, Version 16.10(2r), RELEASE SOFTWARE Copyright (c) 1994-2018 by cisco Systems, Inc. Current image running: Boot ROM0 Last reset cause: LocalSoft C9800-40-K9 platform with 33554432 Kbytes of main memory File size is 0x000015c9 Located packages.conf Image size 5577 inode num 874834, bks cnt 2 blk size 8*512 # File size is 0x01d191f3 Located C9800-rpboot.16.10.01.SPA.pkg Image size 30511603 inode num 874837, bks cnt 7450 blk size 8*512 ################################################################################ ################################################################################ ################################################################################ ########################################################## Boot image size = 30511603 (0x1d191f3) bytes ROM:RSA Self Test Passed ROM:Sha512 Self Test Passed Package header rev 3 structure detected Calculating SHA-1 hash...done validate_package_cs: SHA-1 hash: calculated e36f46af:2c06b38d:eeb6e65b:ffaeb429:a6982d29 expected e36f46af:2c06b38d:eeb6e65b:ffaeb429:a6982d29 Validating main package signatures RSA Signed RELEASE Image Signature Verification Successful. Image validated Jun 21 02:30:21.565: %PMAN-3-PROC_EMPTY_EXEC_FILE: R0/0: pvp: Empty executable u sed for process bt_logger Jun 21 02:30:24.561: %PMAN-3-PROC_EMPTY_EXEC_FILE: R0/0: pvp: Empty executable u sed for process bt_logger Both links down, not waiting for other chassis Chassis number is 1 Jun 21 02:30:25.327: %PMAN-3-PROC_EMPTY_EXEC_FILE: R0/0: pvp: Empty executable u sed for process bt_logger Jun 21 02:30:27.293: %PMAN-3-PROC_EMPTY_EXEC_FILE: R0/0: pvp: Empty executable u sed for process bt_logger Jun 21 02:30:33.770: %PMAN-3-PROC_EMPTY_EXEC_FILE: R0/0: pvp: Empty executable u sed for process bt_logger Jun 21 02:30:37.045: %PMAN-3-PROC_EMPTY_EXEC_FILE: R0/0: pvp: Empty executable u sed for process bt_logger 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 IOS Software [Gibraltar], C9800 Software (C9800_IOS XE), Version 16.10.1, R ELEASE SOFTWARE (fc4) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2018 by Cisco Systems, Inc. Compiled Mon 19-Nov-18 08:27 by mcpre PLEASE READ THE FOLLOWING TERMS CAREFULLY. INSTALLING THE LICENSE OR LICENSE KEY PROVIDED FOR ANY CISCO SOFTWARE PRODUCT, PRODUCT FEATURE, AND/OR SUBSEQUENTLY PROVIDED SOFTWARE FEATURES (COLLECTIVELY, THE "SOFTWARE"), AND/OR WITH SUCH SOFTWARE CONSTITUTES YOUR FULL ACCEPTANCE OF THE FOLLOWING TERMS. YOU MUST NOT PROCEED FURTHER IF YOU ARE NOT WILLING TO BE BOUND BY ALL THE TERMS SET FORTH HEREIN. Your use of the Software is subject to the Cisco End User License Agreement (EULA) and any relevant supplemental terms (SEULA) found at http://www.cisco.com/c/en/us/about/legal/cloud-and-software/software-terms.html. You hereby acknowledge and agree that certain Software and/or features are licensed for a particular term, that the license to such Software and/or features is valid only for the applicable term and that such Software and/or features may be shut down or otherwise terminated by Cisco after expiration of the applicable license term (for example, 90-day trial period). Cisco reserves the right to terminate any such Software feature electronically or by any other means available. While Cisco may provide alerts, it is your sole responsibility to monitor your usage of any such term Software feature to ensure that your systems and networks are prepared for a shutdown of the Software feature. cisco C9800-40-K9 (1GL) processor (revision 1GL) with 7866660K/6147K bytes of me mory. FIPS: Flash Key Check : Key Not Found, FIPS Mode Not Enabled Processor board ID TTM22500DAL 1 Virtual Ethernet interface 4 Ten Gigabit Ethernet interfaces 32768K bytes of non-volatile configuration memory. 33554432K bytes of physical memory. 26255359K bytes of eUSB flash at bootflash:. 234365527K bytes of SATA hard disk at hard disk:. 0K bytes of WebUI ODM Files at webui:. Base Ethernet MAC Address : D4:C9:3C:CC:F2:E0 Installation mode is INSTALL Press RETURN to get started! *Jun 21 02:31:00.165: %IOS XE_PLATFORM-3-WDC_NOT_FOUND: WDC returned length: 0 *Jun 21 02:31:00.185: %SMART_LIC-6-EXPORT_CONTROLLED: Usage of export controlled features is not allowedAdding registry invocations for the WLC platform *Jun 21 02:31:01.743: %SMART_LIC-6-AGENT_READY: Smart Agent for Licensing is ini tialized *Jun 21 02:31:01.743: %SMART_LIC-6-AGENT_ENABLED: Smart Agent for Licensing is e nabled *Jun 21 02:31:01.743: %SMART_LIC-6-EXPORT_CONTROLLED: Usage of export controlled features is not allowed *Jun 21 02:31:04.732: mcp_pm_subsys_init : Init done sucessfullyRA Tracing tool registry return: 0SID Manager, starting initialization ... *Jun 21 02:31:05.511: Notifications initializedSID Manager, completed initializa tion ... *Jun 21 02:31:07.298: %SPANTREE-5-EXTENDED_SYSID: Extended SysId enabled for typ e vlan *Jun 21 02:31:08.999: %CRYPTO-4-AUDITWARN: Encryption audit check could not be p erformed *Jun 21 02:31:09.081: %VOICE_HA-7-STATUS: CUBE HA-supported platform detected. *Jun 21 02:31:09.317: %IOSXE_VMAN-3-MSGINITFAIL: Failed to initialize required V irt-manager resource: Initalize MQIPC *Jun 21 02:31:09.333: mcp_pm_init_done : Called *Jun 21 02:31:09.338: %LINK-3-UPDOWN: Interface Lsmpi0, changed state to up *Jun 21 02:31:09.345: %LINK-3-UPDOWN: Interface EOBC0, changed state to up *Jun 21 02:31:09.345: %LINEPROTO-5-UPDOWN: Line protocol on Interface VoIP-Null0 , changed state to up *Jun 21 02:31:09.346: %LINEPROTO-5-UPDOWN: Line protocol on Interface LI-Null0, changed state to up *Jun 21 02:31:09.346: %LINK-3-UPDOWN: Interface GigabitEthernet0, changed state to down *Jun 21 02:31:09.351: %LINK-3-UPDOWN: Interface LIIN0, changed state to up *Jun 21 02:30:33.738: %PMAN-3-PROC_EMPTY_EXEC_FILE: Chassis 1 R0/0: pvp: Empty e xecutable used for process bt_logger *Jun 21 02:30:37.011: %PMAN-3-PROC_EMPTY_EXEC_FILE: Chassis 1 R0/0: pvp: Empty e xecutable used for process bt_logger *Jun 21 02:30:39.576: %CMFP-6-CRYPTO_MODULE: Chassis 1 R0/0: cman_fp: Crypto Har dware Module is present *Jun 21 02:31:01.754: %LMRP-3-RTU_UNINITIALIZED: Chassis 1 R0/0: lman: RTU not y et initialized: stack enabled 0 *Jun 21 02:31:09.489: %SMART_LIC-6-HA_ROLE_CHANGED: Smart Agent HA role changed to Active. *Jun 21 02:31:10.295: %IOSXE_MGMTVRF-6-CREATE_SUCCESS_INFO: Management vrf Mgmt- intf created with ID 1, ipv4 table-id 0x1, ipv6 table-id 0x1E000001 *Jun 21 02:31:10.344: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, cha nged state to down *Jun 21 02:31:10.345: %LINEPROTO-5-UPDOWN: Line protocol on Interface Lsmpi0, ch anged state to up *Jun 21 02:31:10.394: %LINEPROTO-5-UPDOWN: Line protocol on Interface EOBC0, cha nged state to up *Jun 21 02:31:10.394: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEth ernet0, changed state to down *Jun 21 02:31:10.394: %LINEPROTO-5-UPDOWN: Line protocol on Interface LIIN0, cha nged state to up *Jun 21 02:31:10.966: %ONEP_BASE-6-SS_ENABLED: ONEP: Service set Base was enable d by Default *Jun 21 02:31:12.842: %SYS-6-STARTUP_CONFIG_IGNORED: System startup configuratio n is ignored based on the configuration register setting. *Jun 21 02:31:12.854: %IOSXE_OIR-6-REMSPA: SPA removed from subslot 0/0, interfa ces disabled *Jun 21 02:31:12.913: %SPA_OIR-6-OFFLINECARD: SPA (BUILT-IN-4X10G/1G) offline in subslot 0/0 *Jun 21 02:31:12.919: %IOSXE_OIR-6-INSCARD: Card (fp) inserted in slot F0 *Jun 21 02:31:12.920: %IOSXE_OIR-6-ONLINECARD: Card (fp) online in slot F0 *Jun 21 02:31:12.946: %IOSXE_OIR-6-INSCARD: Card (cc) inserted in slot 0 *Jun 21 02:31:12.946: %IOSXE_OIR-6-ONLINECARD: Card (cc) online in slot 0 *Jun 21 02:31:13.111: % Redundancy mode change to SSO *Jun 21 02:31:13.112: %VOICE_HA-7-STATUS: NONE->SSO; SSO mode can not take effe ct until after a platform reload. *Jun 21 02:31:13.231: %IOSXE_OIR-6-INSSPA: SPA inserted in subslot 0/0 *Jun 21 02:31:14.793: %SYS-5-RESTART: System restarted -- Cisco IOS Software [Gibraltar], C9800 Software (C9800_IOSXE), Version 16.10.1, R ELEASE SOFTWARE (fc4) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2018 by Cisco Systems, Inc. Compiled Mon 19-Nov-18 08:27 by mcpre *Jun 21 02:31:14.834: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF *Jun 21 02:31:14.834: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF *Jun 21 02:31:16.976: %LINK-3-UPDOWN: Interface GigabitEthernet0, changed state to up *Jun 21 02:31:17.079: %SYS-6-BOOTTIME: Time taken to reboot after reload = 325 seconds *Jun 21 02:31:17.977: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEth ernet0, changed state to up *Jun 21 02:31:21.579: %SPA_OIR-6-ONLINECARD: SPA (BUILT-IN-4X10G/1G) online in s ubslot 0/0 *Jun 21 02:31:21.638: %IOSXE_SPA-6-UPDOWN: Interface TenGigabitEthernet0/0/0, li nk down due to remote fault *Jun 21 02:31:21.708: %IOSXE_SPA-6-UPDOWN: Interface TenGigabitEthernet0/0/1, li nk down due to local fault *Jun 21 02:31:21.748: %IOSXE_SPA-6-UPDOWN: Interface TenGigabitEthernet0/0/2, li nk down due to local fault *Jun 21 02:31:21.788: %IOSXE_SPA-6-UPDOWN: Interface TenGigabitEthernet0/0/3, li nk down due to local fault *Jun 21 02:31:21.855: %PNP-6-PNP_DISCOVERY_STOPPED: PnP Discovery stopped (Start up Config Present) *Jun 21 02:31:23.541: %LINK-3-UPDOWN: Interface TenGigabitEthernet0/0/0, changed state to down *Jun 21 02:31:23.571: %LINK-3-UPDOWN: Interface TenGigabitEthernet0/0/1, changed state to down *Jun 21 02:31:23.572: %LINK-3-UPDOWN: Interface TenGigabitEthernet0/0/2, changed state to down *Jun 21 02:31:23.575: %LINK-3-UPDOWN: Interface TenGigabitEthernet0/0/3, changed state to down *Jun 21 02:31:24.680: %IOSXE_SPA-6-UPDOWN: Interface TenGigabitEthernet0/0/0, li nk down due to local fault *Jun 21 02:31:23.618: %LINK-3-UPDOWN: SIP0/0: Interface TenGigabitEthernet0/0/0, changed state to down *Jun 21 02:31:29.036: %PKI-2-NON_AUTHORITATIVE_CLOCK: PKI functions can not be i nitialized until an authoritative time source, like NTP, can be obtained. *Jun 21 02:31:29.491: %LINK-3-UPDOWN: Interface TenGigabitEthernet0/0/0, changed state to up *Jun 21 02:31:30.492: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabit Ethernet0/0/0, changed state to up *Jun 21 02:31:29.491: %LINK-3-UPDOWN: SIP0/0: Interface TenGigabitEthernet0/0/0, changed state to up *Jun 21 02:31:30.495: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, cha nged state to up *Jun 21 02:31:37.119: %CRYPTO_ENGINE-5-KEY_ADDITION: A key named CISCO_IDEVID_SU DI_LEGACY has been generated or imported by pki-sudi *Jun 21 02:31:39.050: %CRYPTO_ENGINE-5-KEY_ADDITION: A key named CISCO_IDEVID_SU DI has been generated or imported by pki-sudi 

第四步：现在无需任何配置即可启动系统。 忽略启动配置向导。

第五步：系统启动后，将启动配置复制到运行配置。

第六步：重新配置启用密码或登录凭证，并检查是否可以通过telnet或ssh访问设备。
  

C9800-40#telnet 172.22.175.1 Trying 172.22.175.1 ... Open User Access Verification Username: admin Password: C9800-40#

步骤 7.将config-register改回0x2002。



C9800-40(config)#config-register 0x2002

步骤 8保存配置。

C9800-40#write memory Building configuration... [OK] 

通过USB恢复设备的密码程序

从ROMMON启动WLC

如果您陷入ROMMON模式而无法启动，请执行以下操作：

rommon 12 > boot File size is 0x0001dfe6 Located memleak.tcl Image size 122854 inode num 12, bks cnt 30 blk size 8*512 ## Boot image size = 122854 (0x1dfe6) bytes Unsigned package found, aborting package loading... Failed to Free memory block at address 0x00000000cd50b000 File size is 0x00000023 Located pnp-tech-time Image size 35 inode num 13, bks cnt 1 blk size 8*512 Boot image size = 35 (0x23) bytes Unsigned package found, aborting package loading... Failed to Free memory block at address 0x00000000cd4d3000 File size is 0x0001ad3f Located pnp-tech-discovery-summary Image size 109887 inode num 14, bks cnt 27 blk size 8*512 # Boot image size = 109887 (0x1ad3f) bytes Unsigned package found, aborting package loading... Failed to Free memory block at address 0x00000000cd49b000 File size is 0x00000268 Located vlan.dat Image size 616 inode num 15, bks cnt 1 blk size 8*512 Boot image size = 616 (0x268) bytes Unsigned package found, aborting package loading... Failed to Free memory block at address 0x00000000cd463000 boot: cannot determine first file name on device "bootflash:/" rommon 13 > 

闪存没有任何可引导的映像：

rommon 13 > dir bootflash: File System: EXT2/EXT3 11 16384 drwx------ lost+found 850305 4096 drwxr-xr-x .installer 588673 4096 drwxrwxrwx .prst_sync 948417 4096 drwxr-xr-x .rollback_timer 1381745 4096 drwxr-xr-x dc_profile_dir 12 122854 -rw-r--r-- memleak.tcl 506913 4096 drwxr-x--- vman_fdb 670433 4096 drwxr-xr-x .dbpersist 793073 4096 drwxr-xr-x onep 13 35 -rw-r--r-- pnp-tech-time 14 109887 -rw-r--r-- pnp-tech-discovery-summary 15 616 -rw-r--r-- vlan.dat 

您可以通过以下任一方法恢复该盒：

• 通过USB笔驱动器加载图像。

• 通过Gigabit0（带外管理接口）加载映像。

通过USB加载映像

步骤1:将带有.bin文件的USB笔驱动器加载到9800控制器。(在9800-80上，由于思科漏洞ID CSCvn82287，ROMMON无法识别USB 3.0闪存驱动器)。 

第二步：将USB驱动程序连接到9800的USB端口0。

前视图：

第三步：从控制台登录控制器，确保它可读取USB。

rommon 19 > dir usb0: File System: FAT32 ! !--Output omitted-- ! 335644 1009389904-rw- <filename>SSA.bin 

第四步：将9800配置为从USB映像启动。

rommon 21 > boot usb0:<filename>.bin Located qwlc-universalk9_wlc.BLD_V169_THROTTLE_LATEST_20180601_191011.SSA.bin, start cluster is 335644 ########################################################################################################
########################################################################################################
########################################################################################################

第五步：9800运行后，将映像从USB复制到bootflash：

WLC# copy usb0:<filename>.bin bootflash:
Destination filename [qwlc-universalk9_wlc.BLD_V169_THROTTLE_LATEST_20180601_191011.SSA.bin]?
Copy in progress...CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC


第六步：将9800从捆绑包模式更改为安装模式。

从USB启动控制器时，控制器将以捆绑包模式启动：

! !--Output omitted-- ! FIPS: Flash Key Check : Key Not Found, FIPS Mode Not Enabled Processor board ID TTM22071510 1 Virtual Ethernet interface 4 Ten Gigabit Ethernet interfaces 32768K bytes of non-volatile configuration memory. 33554432K bytes of physical memory. 26910719K bytes of eUSB flash at bootflash:. 234365527K bytes of SATA hard disk at hard disk:. 15243680K bytes of USB flash at usb0:. 0K bytes of WebUI ODM Files at webui:. Base Ethernet MAC Address : 00:A3:8E:23:A2:40 Installation mode is BUNDLE %INIT: waited 0 seconds for NVRAM to be available

从16.12开始，在UI中，您可以选择在下次升级时移至INSTALL模式。提供所有软件文件（包括当前版本），以进入“安装”模式。

步骤 7.如果引导变量尚未指向packages.conf文件，请对其进行编辑。

WLC#configure terminal Enter configuration commands, one per line. End with CNTL/Z. WLC(config)#no boot system  WLC(config)#boot system bootflash:packages.conf WLC(config)#end WLC#write Building configuration... [OK] WLC#show boot BOOT variable = flash:packages.conf,12; CONFIG_FILE variable does not exist BOOTLDR variable does not exist Configuration register is 0x2102 Standby not ready to show bootvar 

确保配置寄存器为0x2002。

 步骤 8重新加载WLC：

WLC#reload

之后，控制器以安装模式启动。

WLC#show version
! !--Output omitted-- !
Installation mode is INSTALL Configuration register is 0x2002

从TFTP加载映像

要从网络加载映像，您必须将GigabitEthernet0管理端口物理连接到接入端口。

从ROMMON，您可以随时使用命令set验证变量。

rommon 1 > set PS1=rommon ! > ?=0 DEFAULT_GATEWAY=10.1.1.1 ETHER_SPEED_MODE=4 TFTP_RETRY_COUNT=36 SWITCH_NUMBER=1 DLC_DONE=TRUE RET_2_RTS= RET_2_RCALTS= MCP_STARTUP_TRACEFLAGS=00000000:00000000 TFTP_MACADDR=00:db:ad:ba:d0:52 IP_SUBNET_MASK=255.255.255.0 IP_ADDRESS=10.1.1.152 TFTP_SERVER=10.1.1.1 TFTP_FILE=C9800-80-universalk9_wlc.BLD_V1610_1_THROTTLE_LATEST_20181016_174328_2.bin BSI=0 RANDOM_NUM=1650632109

然后您可以逐个设置变量。不需要像对其他设备ROMMON那样在变量名称之前set 输入。键入变量名称时请避免输入拼写错误，因为没有任何排序验证。

rommon 2 > IP_ADDRESS=10.48.71.113 rommon 3 > IP_SUBNET_MASK=255.255.255.128 rommon 4 > DEFAULT_GATEWAY=10.48.71.5

一旦IP设置到位，您就可以使用下一命令从TFTP映像启动：

rommon 5 > boot tftp://10.48.39.33/C9800-80-universalk9_wlc.16.10.01.SPA.bin IP_ADDRESS: 10.48.71.113 IP_SUBNET_MASK: 255.255.255.128 DEFAULT_GATEWAY: 10.48.71.5 TFTP_SERVER: 10.48.39.33 TFTP_FILE: C9800-80-universalk9_wlc.16.10.01.SPA.bin TFTP_MACADDR: 70:6d:15:35:99:ff TFTP_VERBOSE: Progress TFTP_RETRY_COUNT: 36 TFTP_TIMEOUT: 7200 TFTP_BLKSIZE: 1460 TFTP_CHECKSUM: Yes ETHER_PORT: 3 ETHER_SPEED_MODE: 1000MB/HD link up Receiving C9800-80-universalk9_wlc.16.10.01.SPA.bin from 10.48.39.33
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 

 您最终进入Cisco IOS命令行。不要忘记将Cisco IOS映像实际复制到闪存或硬盘，并正确设置引导变量。将文件复制到闪存或硬盘后，您可以从USB（从第6步开始）恢复该过程：

故障排除

如果您在尝试从内存、USB或TFTP中的文件引导时一直看到rommon告诉您“Please reset before booting”，如下所示：

rommon 4 > boot bootflash:C9800-L-universalk9_wlc.V176_1.SPA.bin Please reset before booting

您只需取消配置寄存器并重置即可。重新启动后，问题消失，您可以从任何源启动。

confreg 0x0 reset 

 其他有用的ROMMON命令

dev 命令将列出可用的存储设备（bootflash、硬盘、usb等）。

命令showmon 将显示ROMMON版本。

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