Cisco 3925 is booting again and again, IOS is not working

[JunaidM]

Hi,

I am facing issue with My Cisco 3925 Router it is in ROMMON MODE and booting again and again, here are details from rommon:

rommon 1> set
PS1=rommon ! >
GE_PORT=0
BOOT=
TFTP_CS_BYPASS=1
GE_SPEED_MODE=2
WARM_REBOOT=FALSE
RTC_STAT=0
LICENSE_BOOT_LEVEL=securityk9,securityk9:c3900;uck9,uck9:c3900;
LICENSE_SUITE=
TFTP_CHECKSUM=0
IP_ADDRESS=192.168.1.1
IP_SUBNET_MASK=255.255.255.0
DEFAULT_GATEWAY=192.168.1.2
TFTP_SERVER=192.168.1.2
TFTP_FILE=c3900-universalk9-mz.SPA.157-3.M7.bin
RELOAD_TYPE=1
?=0
BSI=0
RANDOM_NUM=1989110927
CRASHINFO=flash:crashinfo_20200318-232528-GMT
RET_2_RTS=
RET_2_RCALTS=

I have upgraded IOS (c3900-universalk9-mz.SPA.157-3.M7.bin) changed the Flash but issue remains same.

Need the help on priority please, will be thankful to you.

Note: File is attached for the reference as well, urgent issue please.

Regards

[marce1000]

                - Check if there any more recent software versions (or and most recent) available to try

 M.

[JunaidM]

I have tried 2 IOS as below:

Recommended by CISCO: c3900-universalk9-mz.SPA.157-3.M7.bin

and

c3900-universalk9-mz.SPA.155-3.M10.bin

but the issue remains same

[JunaidM]

There are 2 Flash Ports mentioned as  CF 1 and CF 0 I used both but in vain. I am using 256 MB flash I have tried 128 MB but it showed me in compatible so I am using 256 MB now. the issue is still persist, I am needy as I have to resolve it today in any case please.

[marce1000]

                                                       > I have to resolve it today in any case

  That is by definition not guaranteed as this forum is populated by volunteers. If you have business requirements in that context you must make a ticket through Cisco TAC.

  Further more , I can only suggest to factory reset the device and try again, if persistent  - it could be a hardware problem.

 M.

[JunaidM]

  That is by definition not guaranteed as this forum is populated by volunteers. If you have business requirements in that context you must make a ticket through Cisco TAC.

Right, Actually this is for that my company is asking me to resolve it today and I have no TAC option available so I am on my own and can only request to friends like you here.

Can you please guide me how to reset it in rommon becasue I have only below option available in rommon mode:

rommon 2 > ?
alias set and display aliases command
boot boot up an external process
break set/show/clear the breakpoint
confreg configuration register utility
cont continue executing a downloaded image
context display the context of a loaded image
cookie display contents of motherboard cookie PROM in hex
dev list the device table
dir list files in file system
frame print out a selected stack frame
help monitor builtin command help
history monitor command history
iomemset set IO memory percent
meminfo main memory information
repeat repeat a monitor command
reset system reset
rommon-pref Select ROMMON
set display the monitor variables
showmon display currently selected ROM monitor
stack produce a stack trace
sync write monitor environment to NVRAM
sysret print out info from last system return
tftpdnld tftp image download
unalias unset an alias
unset unset a monitor variable
hwpart Read HW resources partition
rommon 3 >

[marce1000]

 - https://community.cisco.com/t5/other-network-architecture/reset-3925/td-p/2828106

 M.

[JunaidM]

I have an option slot in DEsktop computer where I could connect this compact flash so I have connected and formatted it not there is not IOS in the flash so I connected this flash in my Cisco Router 3925 and run below command.  

rommon 4 > dir flash:
program load complete, entry point: 0x4000000, size: 0x18fa0
Directory of flash:

rommon 5 >

Is it fine?

[marce1000]

 - I am not an expert on this but I presume the flash card is not being recognized correctly , format as FAT16, then try again.

 M.

[JunaidM]

I formatted but it still same, I have seen something in configuration is it fine if you have any idea please?

-----------------------------------------------------------------------------

Readonly ROMMON initialized
program load complete, entry point: 0x4000000, size: 0x18fa0
program load complete, entry point: 0x4000000, size: 0x18fa0

IOS Image Load Test
___________________
Digitally Signed Release Software
program load complete, entry point: 0x4000000, size: 0x6dfbac8
Self decompressing the image : ############################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################## [OK]
*** No sreloc section
Smart Init is enabled
smart init is sizing iomem
TYPE MEMORY_REQ
PVDM 0 0x00200000
OIR memory 0x00C00000
Onboard devices &
buffer pools 0x0230F000
-----------------------------------------------
TOTAL: 0x0310F000

Rounded IOMEM up to: 50MB.
Using 4 percent iomem. [50MB/1024MB]

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, C3900 Software (C3900-UNIVERSALK9-M), Version 15.7(3)M7, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2020 by Cisco Systems, Inc.
Compiled Tue 01-Sep-20 15:54 by prod_rel_team

: Unexpected exception to CPU: vector 300, PC = 0x44CA538 , LR = 0x44CA534

-Traceback= 0x44CA538z 0x4026134z 0x40AF2FCz 0x40AF2FCz 0x40261F0z 0x44AFFACz

M8500 CPU Register Context:
PC = 0x044CA538 MSR = 0x02029200 CR = 0x22008022 LR = 0x044CA534
CTR = 0x07C75A44 XER = 0x00000000 DEAR = 0x044AFFA0 PVR = 0x80210030
DEC = 0x0000E568 TBU = 0x00000000 TBL = 0x1DEC4A02
DBCR0= 0x41000000 DBCR1= 0x00000000 DBCR2= 0x00000000
IAC1 = 0x00000000 IAC2 = 0x00000000 DAC2 = 0x00000000 DAC2 = 0x00000000
R0 = 0x3D2011C1 R1 = 0x017A2AD8 R2 = 0x3372F7FF R3 = 0x11BB277C
R4 = 0x00000000 R5 = 0x05C9AF58 R6 = 0x00000000 R7 = 0x017A2A28
R8 = 0x000017A0 R9 = 0x00000000 R10 = 0x02029200 R11 = 0xDF840000
R12 = 0x22008024 R13 = 0x3F82F65E R14 = 0x0000FFFF R15 = 0x13575EC0
R16 = 0x12E278C4 R17 = 0x13575CE4 R18 = 0x11BB02EC R19 = 0x0CFB74CC
R20 = 0x00000000 R21 = 0x00000002 R22 = 0x11BB76B4 R23 = 0xDF840000
R24 = 0x13576060 R25 = 0x12E472DC R26 = 0x11BB034C R27 = 0x00000002
R28 = 0x12E30000 R29 = 0x044AFFA0 R30 = 0x00000000 R31 = 0x044AFFA0
TEXT_START : 0x0400019C
DATA_START : 0x0C000000
No fault history 0▒

=== Flushing messages () ===

Buffered messages:
Queued messages:
*Jan 2 00:00:03.595: %SYS-3-LOGGER_FLUSHING: System pausing to ensure console debugging output.

*Jan 2 00:00:01.467: %SMART_LIC-6-AGENT_READY: Smart Agent for Licensing is initialized
*Jan 2 00:00:01.939: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c3900 Next reboot level = ipbasek9 and License = ipbasek9
*Jan 2 00:00:02.003: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c3900 Next reboot level = securityk9 and License = securityk9
*Jan 2 00:00:02.071: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c3900 Next reboot level = uck9 and License = uck9
*Jan 2 00:00:03.595: %MAINBOARD-4-ECC_SINGLE: A corrected single bit error has occurred in DRAM at location 0x44AFFA0
*Jan 2 00:00:03.595: %SYS-2-INTSCHED: 'may_suspend' at level 4 , all interrupts disabled -Process= "Init", ipl= 4, pid= 3
-Traceback= 5C9AF5Cz 4F7F8A0z 40517ACz 405F61Cz 4482D68z 4F98724z 4026030z
*Jan 2 00:00:03.595: %SYS-2-INTSCHED: 'may_suspend' at level 4 , all interrupts disabled -Process= "Init", ipl= 4, pid= 3
-Traceback= 5C9AF5Cz 4F7F8A0z 40517ACz 405F61Cz 4482D68z 4F98724z 4026030
*** System received a SegV exception ***
signal= 0xb, code= 0x300, context= 0x12fe3c04
PC = 0x44ca538, Vector = 0x300, SP = 0x17a2ad8

System Bootstrap, Version 15.0(1r)M16, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2012 by cisco Systems, Inc.

Total memory size = 1024 MB - DIMM0 = 512 MB, DIMM1 = 512 MB
CISCO3925-CHASSIS with C3900-SPE100/K9 with 1048576 Kbytes of main memory
Main memory is configured to 72/72(dimm 0/1) bit mode with ECC enabled

Readonly ROMMON initialized

-----------------------------------------------------------------------------

Advise please.

[marce1000 · Accepted solution]

>...(boot environment being listed)

                %MAINBOARD-4-ECC_SINGLE: A corrected single bit error has occurred in DRAM at location 0x44AFFA0

 This looks like a hardware problem, probably the device will have to be replaced.

 M.

[marce1000 · Accepted solution]

 Also referring too : https://community.cisco.com/t5/routing/3945-boot-loop-cpu-vector-300/td-p/3825077

                  Check Leo's remark on cleaning the DRAM contacts.

 M.

[JunaidM]

I am thankful you you my friend, what I have done is below:

1- After looking your post, I opened the Cisco 3925 Router by Hardware (Ejected its motherboard outside).

2- I have ejected DRAM DIMM (following link: https://www.cisco.com/c/en/us/td/docs/routers/access/2900/hardware/installation/guide/Hardware_Installation_Guide/Internal_Modules.html#35440)

3- Cleaned both my DRAM DIMM and re-connect it.

4- Then, after POWERED UP the Router, Boom it worked and I came to the CLI mode and now its fine, issue is resolved.

Thanks a lot for your response.

Regards,