用户打来电话说下面各个学校都不能上网了！这个事情有点大，远程登录用户的安全网关，发现安全网关可以登录，运行正常。但是安全网关与核心7609相连的接口是无连接状态，看来问题应该是出在7609上，后来用户反映下面各学校的交换机上连接口指示类都不亮，进一步确定了问题的位置——CISCO7609
匆忙赶到用户现场，发现7609引擎板上的灯全部都亮起了红色，这可不是一个好现象。据用户反映该机房在近两天停电了两次，故障是发生在第二次停电后重起。
通过console口接入发现7609进入到了如下模式：
rommon 1 >
虽然进入到了rommon模式，但最起码能够进来，还是不错的！
通过dir命令查看，发现系统文件仍在，如下是dir查看的结果
rommon 5 > dir bootdisk:
Initializing ATA monitor library...
Directory of bootdisk:
2 160648132 -rw- c7600rsp72043-ipservices-mz.151-3.S4.bin
19613 33554432 -rw- sea_log.dat
23709 461976 -rw- crashinfo_20141013-160619-BJ
发现系统文件后，我按照常规作法，对7609进行了手动引导。
rommon 6 > boot bootdisk:c7600rsp72043-ipservices-mz.151-3.S4.bin
但是引导的结果并不尽如人意！！！，以下是手动引导过程：
Self extracting the image... [OK]
Self decompressing the image : ##################################################################################################################################################################################################################################################################################################### [OK]
*** No sreloc section
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, c7600rsp72043_sp Software (c7600rsp72043_sp-IPSERVICES-M), Version 15.1(3)S4, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Wed 01-Aug-12 15:21 by prod_rel_team
*Aug 4 08:43:10.427: %SYS-SP-3-LOGGER_FLUSHING: System pausing to ensure console debugging output.
Firmware compiled 20-Jan-11 16:56 by integ Build [100]
*Aug 4 08:43:03.275: %SCHED-7-WATCH: Attempt to set uninitialized watched boolean (address 0). -Process= "<interrupt level>", ipl= 3, pid= 3
-Traceback= 81BC060z 837FA8Cz 8844E10z 8844FA4z 8C7C344z 90CA7F0z 91B6D80z 9049E24z 8C7BE4Cz 8397F8Cz 9012F4Cz 9012F4Cz 8398048z 90127B4z 80AA630z 8D6802Cz
*Aug 4 08:43:06.531: %PFREDUN-6-ACTIVE: Initializing as ACTIVE processor
*Aug 4 08:43:10.427: %OIR-SP-6-CONSOLE: Changing console ownership to route processor
System Bootstrap, Version 12.2(33r)SRE, RELEASE SOFTWARE (fc1)
Copyright (c) 2011 by cisco Systems, Inc.
C7600-RSP720-10GE/RP platform with 1048576 Kbytes of main memory
rommon 1 >
经过一翻引导，7609再次进入了rommon模式。此时我的心情不太爽！！！有问题了！
走到这里可能有人跟我一样被上面的显示的内容整蒙了！手动引导竟然不行！！！我在网上查了一下，的确有哥们碰到了类似的情况，重灌了系统也不行，但是论坛上并没有给出具体的解决办法，有人说7609的子卡坏了，有人建议把只保留引擎重新启动。我也曾尝试只保留引擎重启可是依然不行。
难道试着灌一下IOS？还有其它的方法么？经过一翻思量和商讨，决定把灌IOS放在最后，在这之前要进行一个重要的操作，更改寄存器值！不能确保一定好用，但是也不能说一定没用！
rommon 1 > confreg 0x2102
You must reset or power cycle for new config to take effect
修改寄存器值后需要重启才能生效（其实在改2102之前我还做过别的修改）
对系统进行Reset后，发现7609在一步步进行正常启动
Resetting .......
Download Start
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Download Completed! Booting the image.
Self decompressing the image : ############################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################## [OK]
Cisco IOS Software, c7600rsp72043_rp Software (c7600rsp72043_rp-IPSERVICES-M), Version 15.1(3)S4, RELEASE SOFTWARE (fc2)
Compiled Wed 01-Aug-12 15:14 by prod_rel_team
Cisco CISCO7609-S (M8500) processor (revision 1.0) with 917504K/65536K bytes of memory.
Processor board ID FXS1638Q19L
BASEBOARD: RSP720-10GE
CPU: MPC8548_E, Version: 2.1, (0x80390021)
CORE: E500, Version: 2.2, (0x80210022)
CPU:1200MHz, CCB:400MHz, DDR:200MHz,
L1: D-cache 32 kB enabled
I-cache 32 kB enabled
Last reset from s/w reset
1 Virtual Ethernet interface
3 Gigabit Ethernet interfaces
2 Ten Gigabit Ethernet interfaces
3964K bytes of non-volatile configuration memory.
500472K bytes of Internal ATA PCMCIA card (Sector size 512 bytes).
interface GigabitEthernet1/1
后面检测板卡的过程我就不贴出来了。
到最后系统终于启动正常，为了进一步测试我把电源断开，再重新加电，系统依然正常启动！至此，故障解决了！
胡思乱想：我在想是不是由于用户那里的两次断电，加电过程，由于电压、电流高低不同，导致瞬间系统的寄存器值发生改变，以导致了后来的故障！
本文转自 弯月楼主 51CTO博客，原文链接：http://blog.51cto.com/05wylz/1682369，如需转载请自行联系原作者
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