Recovering from a corrupt IOS image - Revision history

Ppapa at 00:08, 23 November 2011

2011-11-23T00:08:31Z

Ppapa at 23:51, 7 March 2011

2011-03-07T23:51:22Z

Ppapa at 23:49, 7 March 2011

2011-03-07T23:49:33Z

Ppapa at 23:48, 7 March 2011

2011-03-07T23:48:54Z

Ppapa at 05:23, 7 March 2011

2011-03-07T05:23:53Z

Ppapa at 05:04, 7 March 2011

2011-03-07T05:04:12Z

Ppapa at 05:03, 7 March 2011

2011-03-07T05:03:36Z

Ppapa at 05:02, 7 March 2011

2011-03-07T05:02:40Z

Ppapa at 04:59, 7 March 2011

2011-03-07T04:59:46Z

Ppapa at 04:58, 7 March 2011

2011-03-07T04:58:38Z

@@ Line 42: / Line 42: @@
    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
 . To speed the xmodem transfer up, change the Baud rate of the switch

← Older revision		Revision as of 23:51, 7 March 2011
Line 85:		Line 85:
	switch(config)# '''exit'''		switch(config)# '''exit'''
	switch# '''wr mem'''		switch# '''wr mem'''
		+
		+	The switch is now ready for advanced configuration :-)

@@ Line 80: / Line 80: @@
 . 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'''

← Older revision		Revision as of 23:48, 7 March 2011
Line 75:		Line 75:

	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

@@ 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.

@@ Line 51: / Line 51: @@
 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.
 . At the '''switch:''' prompt, begin the xmodem transfer of the new IOS image:

@@ Line 8: / Line 8: @@
    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].
 . Connect to the switch with HyperTerminal with these the settings:
@@ Line 25: / Line 26: @@
    switch: load_helper
-. List the contents of the switches flash memory
+. List the contents of the switches flash memory.
    switch: '''dir flash:'''
@@ Line 49: / Line 50: @@
 You will lose access to the console, but a restart of the HyperTerminal session with a new Baud rate of 115200 will fix this!
 . At the '''switch:''' prompt, begin the xmodem transfer of the new IOS image:
@@ Line 59: / Line 62: @@
    a. Choose '''Transfer''' > '''Send File'''.

← Older revision		Revision as of 04:59, 7 March 2011
Line 55:		Line 55:
	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'''.

← Older revision		Revision as of 04:58, 7 March 2011
Line 18:		Line 18:
	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