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unrecoverable Cisco 3750 switch

PLEASE HELP ME!!!!

After re-image the flash of my c3750 switch, it will not boot properly anymore. See below how the boot process (between "") works.

"

Boot Sector Filesystem (bs) installed, fsid: 2

Base ethernet MAC Address: 00:14:a8:fc:8a:00

Xmodem file system is available.

The password-recovery mechanism is enabled.

Initializing Flash...

flashfs[0]: 1 files, 1 directoriesúYP#úYP¬úYP úYP úYP úYP úYP

úYP úYP úYOÿúYOûúYO÷úYOóúYOïúYOëúYOçúYOãúYOßúYOÛúYO×úYOÓúYOÏúYOËúYOÇúYOÃúYO¿úYO»úYO•úYO³úYO¯úYO«úYO§úYO£úYOŸúYO›úYO-úYO“úYOúYO‹úYO‡úYOƒúYOúYO{úYOwúYOsúYOoúYOkúYOgúYOcúYO_úYO[úYOWúYOSúYOOúYOKúYOGúYOCúYO?úYO;úYO7úYO3úYO/úYO+úYO'úYO#úYO¬úYO úYO úYO úYO úYO

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úY úY úYflashfs[0]: flashfs fsck took 19 seconds.

...done Initializing Flash.

done.

Loading "flash:/c3750-ipbasek9-mz.122-25.SEE4.bin"...@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

"

After this, the switch hangs.....

I already follow the standard procedure:

switch: flash_init

switch: load_helper

switch: copy xmodem: flash:c3750-ipservicesk9-mz.122-50.SE2.bin

switch: boot

and...

switch: flash_init

switch: load_helper

switch: format flash:

switch: copy xmodem: flash:c3750-ipservicesk9-mz.122-50.SE2.bin

switch: boot flash:c3750-ipservicesk9-mz.122-50.SE2.bin

I see similar characters scrolling on the screen after I start "flash_init" or "format flash:".

Strange detail: I see no directories with the dir flash: command,

"

switch: dir flash:

Directory of flash:/

2 -rwx 7215104 <date> c3750-ipbasek9-mz.122-25.SEE4.bin

8782848 bytes available (7216128 bytes used)

"

although the boot process sees one ("flashfs[0]: 1 files, 1 directories").

I almost used every option of the switch mode console and do not know what to do so far.

Please help!!!

Thanks.

Marcel

7 REPLIES
Cisco Employee

Re: unrecoverable Cisco 3750 switch

Hello Marcel,

I am sorry about the problems you're having.

Regarding the question about directories: each filesystem has a root directory. That is why the fsck reports 1 directory though you do not see any.

It is conceivable that the image you tried to install has performed a bootloader upgrade and this has gone wrong. Unfortunately, I am at loss what would lead directly to a solution of your problem. I see two possibilities: either trying to revert back to an old version of IOS and hope that it will be able to boot, or instead, trying to install the current version for the 3750 which is the 12.2(50)SE3. According to your output, however, you have already tried that, is that so?

Have you also tried the fsck -test flash: command? Does it report any errors?

Also, while in bootloader mode, verify the environment variables using the set command. Try to make sure that only those variables do exist which are listed in the following URL and that they have the default values according to that URL. All other environment variables should be deleted using the unset command.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_50_se/command/reference/bootldr.html#wp1004653

Best regards,

Peter

Community Member

Re: unrecoverable Cisco 3750 switch

Peter, thanks for your input.

I followed your instructions. Unfortunately the switch is still not functioning properly. I hope you can help me further.

Below some output. First the result of "set", the result of "flash_init" and the result "fsck -test flash:".

AUD=9600

BOOT=

CLEI_CODE_NUMBER=CNMV100CRE

CONFIG_FILE=config.text

MAC_ADDR=00:14:A8:FC:8A:00

MODEL_NUM=WS-C3750-24TS-S

MODEL_REVISION_NUM=K0

MOTHERBOARD_ASSEMBLY_NUM=73-9677-08

MOTHERBOARD_REVISION_NUM=B0

MOTHERBOARD_SERIAL_NUM=CAT09260VXG

POWER_SUPPLY_PART_NUM=341-0034-01

POWER_SUPPLY_SERIAL_NUM=DAB0920087V

PS1=switch:

SWITCH_NUMBER=1

SWITCH_PRIORITY=1

SYSTEM_SERIAL_NUM=CAT0926R14G

TAN_NUM=800-25857-02

TAN_REVISION_NUMBER=A0

VERSION_ID=V05

switch: flash_init

Initializing Flash...

flashfs[0]: 1 files, 1 directoriesúYCWúYCSúYCOúYCKúYCGúYCCúYC?úYC;úYC7úYC3úYC/úC

B

A

úY

úY úY ûúY ÷úY óúY ïúY ëúY çúY ãúY ßúY Y

úY

úY

Y

Y

.

...done Initializing Flash.

switch:

switch: fsck -test flash:

Are you sure you want to fsck "flash:" (could take some time) (y/n)?y

flashfs[0]: testing block 0...erased 5 times

flashfs[0]: testing block 1...erased 5 times

flashfs[0]: testing block 2...erased 5 times

flashfs[0]: testing block 3...erased 5 times

flashfs[0]: testing block 4...erased 5 times

flashfs[0]: testing block 5...erased 5 times

flashfs[0]: testing block 6...erased 5 times

flashfs[0]: testing block 7...erased 5 times

flashfs[0]: testing block 8...erased 5 times

flashfs[0]: testing block 9...erased 5 times

flashfs[0]: testing block 10...erased 5 times

-- MORE --

flashfs[0]: testing block 124...erased 8 times

flashfs[0]: 1 files, 1 directoriesúRþçúRþãúRþßúRþÛúRþ×úRþÓúRþÏúRþËúRþÇúRþÃúRþ¿úþ

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-- MORE --

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switch:

Community Member

Re: unrecoverable Cisco 3750 switch

Peter, thanks for your input. I followed your instructions. Unfortunately the switch is still not functioning properly. I hope you can help me further.

Below some output. First the result of "set", second the resuut of "flash_init" and last the result of "fsck -test flash:".

BAUD=9600

BOOT=

CLEI_CODE_NUMBER=CNMV100CRE

CONFIG_FILE=config.text

MAC_ADDR=00:14:A8:FC:8A:00

MODEL_NUM=WS-C3750-24TS-S

MODEL_REVISION_NUM=K0

MOTHERBOARD_ASSEMBLY_NUM=73-9677-08

MOTHERBOARD_REVISION_NUM=B0

MOTHERBOARD_SERIAL_NUM=CAT09260VXG

POWER_SUPPLY_PART_NUM=341-0034-01

POWER_SUPPLY_SERIAL_NUM=DAB0920087V

PS1=switch:

SWITCH_NUMBER=1

SWITCH_PRIORITY=1

SYSTEM_SERIAL_NUM=CAT0926R14G

TAN_NUM=800-25857-02

TAN_REVISION_NUMBER=A0

VERSION_ID=V05

switch: flash_init

Initializing Flash...

flashfs[0]: 1 files, 1 directoriesúYCWúYCSúYCOúYCKúYCGúYCCúYC?úYC;úYC7úYC3úYC/úC

B

A

úY

úY úY ûúY ÷úY óúY ïúY ëúY çúY ãúY ßúY Y

úY

úY

Y

Y

Y

.

...done Initializing Flash.

switch:

switch: fsck -test flash:

Are you sure you want to fsck "flash:" (could take some time) (y/n)?y

flashfs[0]: testing block 0...erased 5 times

flashfs[0]: testing block 1...erased 5 times

flashfs[0]: testing block 2...erased 5 times

flashfs[0]: testing block 3...erased 5 times

flashfs[0]: testing block 4...erased 5 times

flashfs[0]: testing block 5...erased 5 times

flashfs[0]: testing block 6...erased 5 times

flashfs[0]: testing block 7...erased 5 times

flashfs[0]: testing block 8...erased 5 times

flashfs[0]: testing block 9...erased 5 times

flashfs[0]: testing block 10...erased 5 times

-- MORE --

flashfs[0]: testing block 124...erased 8 times

flashfs[0]: 1 files, 1 directoriesúRþçúRþãúRþßúRþÛúRþ×úRþÓúRþÏúRþËúRþÇúRþÃúRþ¿úþ

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.

switch:

Community Member

Re: unrecoverable Cisco 3750 switch

Peter, thanks for your input. I followed your instructions. Unfortunately the switch is still not functioning properly. I hope you can help me further.

Below some output. First the result of "set", second the resuut of "flash_init" and last the result of "fsck -test flash:".

BAUD=9600

BOOT=

CLEI_CODE_NUMBER=CNMV100CRE

CONFIG_FILE=config.text

MAC_ADDR=00:14:A8:FC:8A:00

MODEL_NUM=WS-C3750-24TS-S

MODEL_REVISION_NUM=K0

MOTHERBOARD_ASSEMBLY_NUM=73-9677-08

MOTHERBOARD_REVISION_NUM=B0

MOTHERBOARD_SERIAL_NUM=CAT09260VXG

POWER_SUPPLY_PART_NUM=341-0034-01

POWER_SUPPLY_SERIAL_NUM=DAB0920087V

PS1=switch:

SWITCH_NUMBER=1

SWITCH_PRIORITY=1

SYSTEM_SERIAL_NUM=CAT0926R14G

TAN_NUM=800-25857-02

TAN_REVISION_NUMBER=A0

VERSION_ID=V05

switch: flash_init

Initializing Flash...

flashfs[0]: 1 files, 1 directoriesúYCWúYCSúYCOúYCKúYCGúYCCúYC?úYC;úYC7úYC3úYC/úC

B

A

úY

úY úY ûúY ÷úY óúY ïúY ëúY çúY ãúY ßúY Y

úY

úY

Y

Y

Y

.

...done Initializing Flash.

switch:

switch: fsck -test flash:

Are you sure you want to fsck "flash:" (could take some time) (y/n)?y

flashfs[0]: testing block 0...erased 5 times

flashfs[0]: testing block 1...erased 5 times

flashfs[0]: testing block 2...erased 5 times

flashfs[0]: testing block 3...erased 5 times

flashfs[0]: testing block 4...erased 5 times

flashfs[0]: testing block 5...erased 5 times

flashfs[0]: testing block 6...erased 5 times

flashfs[0]: testing block 7...erased 5 times

flashfs[0]: testing block 8...erased 5 times

flashfs[0]: testing block 9...erased 5 times

flashfs[0]: testing block 10...erased 5 times

-- MORE --

flashfs[0]: testing block 124...erased 8 times

flashfs[0]: 1 files, 1 directoriesúRþçúRþãúRþßúRþÛúRþ×úRþÓúRþÏúRþËúRþÇúRþÃúRþ¿úþ

ý

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.

switch:

Community Member

Re: unrecoverable Cisco 3750 switch

Peter, thanks for your input. I followed your instructions. Unfortunately the switch is still not functioning properly. I hope you can help me further.

I attached a file with output, due to webiste "stack" errors. First the result of "set", second the resuut of "flash_init" and last the result of "fsck -test flash:".

Community Member

Re: unrecoverable Cisco 3750 switch

I have uploaded 2 old images, just in case there is some bad block on flash. Neither will boot.

After uploading images, rebooting, flash format. flash_init for hundred times) I get the message:

"

switch: dir flash:

unable to stat flash:/: invalid argument

switch: dir flash:

unable to stat flash:/: invalid argument

switch: flash_init

Initializing Flash...

Warning: Trying to free already-freed memory!!!flashfs[0]: found corrupted block[0] (byte 0, sector 12), fixing...flashfs[0]: sector 151, block 124 checksum (0x2ea1 != 0xe2f0)flashfs[0]: sector152, block 124 checksum (0x2ea1 != 0xe2f0)flashfs[0]: sector 153, block 124 checksum (0x2ea1 != 0xe2f0)flashfs[0]: sector 154, block 124 checksum (0x2ea1 != 0xe2f0)flashfs[0]: 1 files, 1 directoriesflashfs[0]: 0 orphaned files, 0 orphaned directoriesflashfs[0]: Total bytes: 15998976flashfs[0]: Bytes used: 74240flashfs[0]: Bytes available: 15924736flashfs[0]: flashfs fsck took 10 seconds....done Initializing Flash.switch:"

I seems that block 124 is bad. And it seems that block 124 is always used (read). Something like sector 0 of a HD.

Unfortunately, a HD is cheaper to replace than a whole C3750, because flash is fixed on the board.

If there is a way to tell the system not to use block 124, then it would work out.

Regards,Marcel

Community Member

unrecoverable Cisco 3750 switch

Guys, I am a new user in this community.

Did you by any chance backup the old ios before re_imaging?.

Actually, I have different situation for catalyst 3524 switch, which wouldn't even connect properly with the terminal emulator to enable me issue command.

When I switch on the switch and try to connect, it shows " <0><0><0><0> <0><0>  <0><0<0><0>  `À<0><0><0><0><0><0>", and hangs.

Any new idea will be  appreciated!

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