Recovering from a corrupt IOS image - Revision history

Ppapa at 00:08, 23 November 2011

2011-11-23T00:08:31Z

← Older revision		Revision as of 00:08, 23 November 2011
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	switch: '''delete flash:c3750-k9-mz.122-44.se2.bin'''		switch: '''delete flash:c3750-k9-mz.122-44.se2.bin'''
	Are you sure you want to delete "flash:~~c375 if you don't do this, it will take literally hours!~~		Are you sure you want to delete "flash:c3750-k9-mz.122-44.se2.bin": yes

	6. To speed the xmodem transfer up, change the Baud rate of the switch		6. To speed the xmodem transfer up, change the Baud rate of the switch

Ppapa at 23:51, 7 March 2011

2011-03-07T23:51:22Z

← Older revision		Revision as of 23:51, 7 March 2011
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	switch(config)# '''exit'''		switch(config)# '''exit'''
	switch# '''wr mem'''		switch# '''wr mem'''

			The switch is now ready for advanced configuration :-)

Ppapa at 23:49, 7 March 2011

2011-03-07T23:49:33Z

← Older revision		Revision as of 23:49, 7 March 2011
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	10. Once you've finished the basic config, enter Enable mode and set the switch to use the new IOS version by default		10. Once you've finished the basic config, enter Enable mode and set the switch to use the new IOS version by default

	switch# config t		switch# '''config t'''
	switch(config)# no boot system flash:oldflashimage		switch(config)# '''no boot system flash:''oldflashimage'''''
	switch(config)# boot system flash:newflashimage		switch(config)# '''boot system flash:''newflashimage'''''
	switch(config)# exit		switch(config)# '''exit'''
	switch# wr mem		switch# '''wr mem'''

Ppapa at 23:48, 7 March 2011

2011-03-07T23:48:54Z

← Older revision		Revision as of 23:48, 7 March 2011
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	switch: '''boot flash:''imagefilename'''''		switch: '''boot flash:''imagefilename'''''

			Assuming it boot correctly, the switch should now be ready to configure as if it were a new switch.

			10. Once you've finished the basic config, enter Enable mode and set the switch to use the new IOS version by default

			switch# config t
			switch(config)# no boot system flash:oldflashimage
			switch(config)# boot system flash:newflashimage
			switch(config)# exit
			switch# wr mem

Ppapa at 05:23, 7 March 2011

2011-03-07T05:23:53Z

@@ Line 43: / Line 43: @@
    switch: '''delete flash:c3750-k9-mz.122-44.se2.bin'''
    Are you sure you want to delete "flash:c375  if you don't do this, it will take literally hours!
 . To speed the xmodem transfer up, change the Baud rate of the switch
@@ Line 76: / Line 61: @@
    a. Choose '''Transfer''' > '''Send File'''.
-   b. Choose the '''Xmodem''' protocol in the '''Send File''' dialog box and click '''Browse''' in order to select the Cisco IOS image (.bin file) that you downloaded from Cisco.
+   b. Choose the '''Xmodem''' protocol in the '''Send File''' dialog box and click '''Browse''' in order to select the IOS image (.bin file) that you downloaded from Cisco.
    c. Click '''Send''' in order to begin the Xmodem transfer.

Ppapa at 05:04, 7 March 2011

2011-03-07T05:04:12Z

← Older revision		Revision as of 05:04, 7 March 2011
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	switch: '''delete flash:c3750-k9-mz.122-44.se2.bin'''		switch: '''delete flash:c3750-k9-mz.122-44.se2.bin'''
	Are you sure you want to delete "flash:~~c3750~~-k9-mz.122-44.se2.bin" (y/n)?'''y'''		Are you sure you want to delete "flash:c375 if you don't do this, it will take literally hours!

			7. At the '''switch:''' prompt, begin the xmodem transfer of the new IOS image:

			switch: '''copy xmodem: flash:''imagefilename'''''
			Begin the Xmodem or Xmodem-1K transfer now...
			CCC

			8. From HyperTerminal,

			a. Choose '''Transfer''' > '''Send File'''.
			b. Choose the '''Xmodem''' protocol in the '''Send File''' dialog box and click '''Browse''' in order to select the Cisco IOS image (.bin file) that you downloaded from Cisco.
			c. Click '''Send''' in order to begin the Xmodem transfer.

			0-k9-mz.122-44.se2.bin" (y/n)?'''y'''
	File "flash:c3750-k9-mz.122-44.se2.bin" deleted		File "flash:c3750-k9-mz.122-44.se2.bin" deleted

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	CCC		CCC

	8. From HyperTerminal,		8. From HyperTerminal:

	a. Choose '''Transfer''' > '''Send File'''.		a. Choose '''Transfer''' > '''Send File'''.
	b. Choose the '''Xmodem''' protocol in the '''Send File''' dialog box and click '''Browse''' in order to select the Cisco IOS image (.bin file) that you downloaded from Cisco.		b. Choose the '''Xmodem''' protocol in the '''Send File''' dialog box and click '''Browse''' in order to select the Cisco IOS image (.bin file) that you downloaded from Cisco.
	c. Click '''Send''' in order to begin the Xmodem transfer.		c. Click '''Send''' in order to begin the Xmodem transfer.

Ppapa at 05:03, 7 March 2011

2011-03-07T05:03:36Z

← Older revision		Revision as of 05:03, 7 March 2011
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	You will lose access to the console, but a restart of the HyperTerminal session with a new Baud rate of 115200 will fix this!		You will lose access to the console, but a restart of the HyperTerminal session with a new Baud rate of 115200 will fix this!

	'''NOTE:''' if you don't do this, it will take literally hours!		'''NOTE:''' if you don't do this, it will take literally hours! You can change it back later.

	7. At the '''switch:''' prompt, begin the xmodem transfer of the new IOS image:		7. At the '''switch:''' prompt, begin the xmodem transfer of the new IOS image:

Ppapa at 05:02, 7 March 2011

2011-03-07T05:02:40Z

← Older revision		Revision as of 05:02, 7 March 2011
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	switch:		switch:

	You have a corrupt IOS image! To recover you will need Microsoft Windows HyperTerminal to perform an xmodem transfer of a new IOS image to the switch (obviously you can use other terminal emulators etc, but you'll get no help from me :-). This method has been tested with a Cisco 3750G. You can see more specific info for different switch models [http://www.cisco.com/en/US/products/hw/switches/ps628/products_tech_note09186a0080169696.shtml here].		You have a corrupt IOS image! Download a new one from the Cisco website! To recover you will need Microsoft Windows HyperTerminal to perform an xmodem transfer of a new IOS image to the switch (obviously you can use other terminal emulators etc, but you'll get no help from me :-). This method has been tested with a Cisco 3750G. You can see more specific info for different switch models [http://www.cisco.com/en/US/products/hw/switches/ps628/products_tech_note09186a0080169696.shtml here].


	1. Connect to the switch with HyperTerminal with these the settings:		1. Connect to the switch with HyperTerminal with these the settings:
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	switch: load_helper		switch: load_helper

	4. List the contents of the switches flash memory		4. List the contents of the switches flash memory.

	switch: '''dir flash:'''		switch: '''dir flash:'''
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	You will lose access to the console, but a restart of the HyperTerminal session with a new Baud rate of 115200 will fix this!		You will lose access to the console, but a restart of the HyperTerminal session with a new Baud rate of 115200 will fix this!

			'''NOTE:''' if you don't do this, it will take literally hours!

	7. At the '''switch:''' prompt, begin the xmodem transfer of the new IOS image:		7. At the '''switch:''' prompt, begin the xmodem transfer of the new IOS image:
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	a. Choose '''Transfer''' > '''Send File'''.		a. Choose '''Transfer''' > '''Send File'''.
			b. Choose the '''Xmodem''' protocol in the '''Send File''' dialog box and click '''Browse''' in order to select the Cisco IOS image (.bin file) that you downloaded from Cisco.
			c. Click '''Send''' in order to begin the Xmodem transfer.

Ppapa at 04:59, 7 March 2011

2011-03-07T04:59:46Z

← Older revision		Revision as of 04:59, 7 March 2011
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	Begin the Xmodem or Xmodem-1K transfer now...		Begin the Xmodem or Xmodem-1K transfer now...
	CCC		CCC

			8. From HyperTerminal,

			a. Choose '''Transfer''' > '''Send File'''.

Ppapa at 04:58, 7 March 2011

2011-03-07T04:58:38Z

← Older revision		Revision as of 04:58, 7 March 2011
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	Flow control: None		Flow control: None

	2. If the switch is not already at the '''switch:''' prompt, remove the power cord. Hold down the '''MODE''' button on the front of the switch and re-insert the power cord.		2. If the switch is not already at the '''switch:''' prompt, remove the power cord. Hold down the '''MODE''' button on the front of the switch and re-insert the power cord. Wait until the '''SYST''' light is flashing away and let go of the '''MODE''' button.

			3. You should be at the '''switch:''' prompt. Type the following commands:

			switch: flash_init
			switch: load_helper

			4. List the contents of the switches flash memory

			switch: '''dir flash:'''
			Directory of flash:/

			2 -rwx 10761792 <date> c3750-k9-mz.122-44.se2.bin
			3 -rwx 676 <date> vlan.dat
			4 -rwx 7807 <date> config.backup
			83 -rwx 98 <date> private-config.text
			86 -rwx 1048 <date> multiple-fs

			5113856 bytes available (10885120 bytes used)

			5. If there is no room in flash for another IOS image, delete the old one:

			switch: '''delete flash:c3750-k9-mz.122-44.se2.bin'''
			Are you sure you want to delete "flash:c3750-k9-mz.122-44.se2.bin" (y/n)?'''y'''
			File "flash:c3750-k9-mz.122-44.se2.bin" deleted

			6. To speed the xmodem transfer up, change the Baud rate of the switch

			switch: '''set BAUD 115200'''

			You will lose access to the console, but a restart of the HyperTerminal session with a new Baud rate of 115200 will fix this!

			7. At the '''switch:''' prompt, begin the xmodem transfer of the new IOS image:

			switch: '''copy xmodem: flash:''imagefilename'''''
			Begin the Xmodem or Xmodem-1K transfer now...
			CCC