Cisco has variations on their reset procedure but mainly consistent which makes it fairly easy. We used to have a pair of 3750 cisco switches acting as the core of our network. The flash on those switches should be big enough to hold a second copy of ios. As a result, the time needs to be set either manually or by an external ntp time source. Startup configuration files are used during system startup to. For instance, if the last octet of the configuration register is set to 1, the router will boot from rom and ignore the boot system. Catalyst 65006000 msfccatalyst 6000 series msfc 12. Catalyst 3750x and 3560x switch command reference ol2152201 appendix a catalyst 3750x and 3560x switch boot loader commands boot related commands command description set sets the boot environment variable to boot a specific image when the boot keyword is. How to reset a cisco 3750 to default factory settings. Once the switch is powered off, hold down the mode button, and power the switch on. I have the image i need on my pc and have booted the switch to the switch.
Configuring date and time on a cisco 3750g layer 3 switch. I have copied the ios to the master and member switches. This manual change back to the computer serial port and super terminal 2 transmission rate is 9600. Maricruz on how to recover a cisco switch from boot loader tags 10. How to reset cisco catalyst 3750 back to factory defaults. Cisco 3750 ios image download for gns3 lab entosobo. Thanks man, i fu up my switch with the wrong ios image 3750x my fault and the switch was not able to boot. Ahh, the joys of recovering a corrupt image with xmodem. This chapter describes how to identify and resolve software problems related to the cisco ios software on the catalyst 3750x or 3560x switch. You must reset or power cycle for new config to take effect. Learn the necessary commands and options to help avoid unpleasant security breaches from tampered ios images or unexpected boot failures from corrupt images. Cisco 3750 ios backup, delete, restore and upgrade hindi networking guruji. This appendix describes how to manipulate the catalyst 3750 switch flash file system.
Cisco routers typically store a copy of the devices operating system cisco ios in their flash memory, and load this operating system image into ram during the bootup process. I have a 3750 that lost its ios image during a switch stack upgrade failure. Following the reload with the new ios on the master, the member switches were not recognized. Cisco serial console cable ios image for the cisco 3750 switch stored on the windows 7 computer how to recover cisco 3750 firmware to a working state. A mixed hardware and software stack with catalyst 3750x, catalyst 3750e, and. However, if you have a redundant configuration, you can limit the downtime to a few seconds. Reload the entire switch stack after the vrf configuration change for the vrf. Remember these when youre copying the files over, but i dont think youll need them when you go to configure your boot statement you should be able to just say boot system switch 1 flash. How to restore cisco ios switch catalyst 3750 series. Recovering the cisco ios image on a cisco switch is one of those tasks that is nice to know and not need it then need it and not know it. Use the boot bootloader command to load and boot up an executable image and to enter the commandline interface. You can release the mode button a second or two after the led above port 1x goes off. Recovering catalyst fixed configuration switches from a corrupted.
You can use the boot autodownloadsw global configuration command to. This procedure uses boot loader commands and tftp to recover from a corrupted. Delete the flash of the new switch since the flash size is 16mb and the bin file size is 11mb. Cisco 3750x,3750g network engineering stack exchange. When ios has loaded, it will look for the startupconfig file on the nvram. Cisco stack rebootinglosing the master consequences. Plug the other end of the serial cable into the cisco 3750 console port. Howto upgrade ios on a 3750 switch stack debian admin. Ios command to change switch boot image order in flash. The cisco ios software image downloaded onto the workstation that acts as. Just that i couldnt download the ios from your given link. Catalyst 3750x and 3560x switch software configuration guide.
When you have two or more 3750 in a stack configuration and need to upgrade the image, you will have a long service disruption it can take about 7 10 minutes, because depending on the image the bootloader will be upgraded too and post tests also take their time. But 2 switches of a stack of 3 cannot take the last version. View and download cisco catalyst 3750x command reference manual online. Ios upgrade failed on cisco catalyst 375048ps switch. Here is a reworked ccs script to upgrade 2960s and 3560s. A cisco catalyst 3750g12s may loop while booting after performing an ios upgrade. This appendix describes how to manipulate the catalyst 3750x or. You can access the boot loader through a switch console connection at 9600 bs. In this video i will show you how to rest a cisco 3750 switch to factory settings. The feature set on the universal image is determined by the purchased license. Catalyst 3750x and 3560x switch software configuration. Unless otherwise noted, the term switch refers to a catalyst 3750x. Boot the new image that you just copied by issuing the boot flash.
Run primary image active run backup image version x. While the router is powered off, plug in the usb flash drive to the usb. How to recover cisco 3750 firmware to a working state. In addition to the boot system commands, you can change which image the router will boot from using the routers configuration register. Cisco switchingrouting stacking 3750x with universal image with 3750g running bin image. Step 6 for catalyst 3750x switches, power on the rest of the switch stack.
It is possible to boot a cisco router off of a usb flash drive. Booting a cisco ios router from a usb flash drive in. Catalyst 3750x and 3560x switch boot loader commands. Cisco switchingrouting 3750 prompt for password change. How to upgrade software images on catalyst switch layer 3.
We dusted off an unused cisco catalyst 375048ps switch that we found in storage. Howto boot a cisco router off a usb flash drive conetrix. The configuration below shows the commands for setting the time on a. How to recover a cisco switch from boot loader unolution. With password recovery disabled, the user can still interrupt the boot process and change the password, but the configuration file config. When i look at the version i see that bootloader is still the old version 12. There are a number of cisco emulators out right now.
How do i set up pxe booting across vlans on a cisco 3750. Hi all, i am having 3750 which is getting stuck during boot, not coming to normalrommon mode. I acquired two cisco 3750 switches from another part of my organization. Recovering a cisco fixed switch from the boot loader. They are the same model, i dont understand why they cannot boot on the new image. Booting a different ios image cisco ios cookbook, 2nd. If the device has not had its configuration erased, press break or controlr, and then press the esc key, which will display the following menu. The bundle mode uses the monolithic cisco ios images to boot a switch. Switches in the stack do not boot the new image version mismatch. Catalyst 3750x and catalyst 3560x switch software configuration.
Cisco ios software, c2960 software c2960lanbasek9m, version 12. The flash memory of cisco routers is usually internal or can be a removable flash card on higher end routers. Everything was functioning fine on that pair of units. Cisco switchingrouting catalyst 3750x roll staking upgrade nov, 2011 i have read that the 3750x supports upgrading with minimal traffic lost with rsu feature, on the configuration guide the scnario is with the end user connected to the 3750x stack with lacp and the uplinks to the network running stp, one uplink is forwarding and the. Se1 ip base license into a stack of 3750g switches running c3750ipbasek9mz. How to setup tftp server in windows using tftpd64tftpd32 duration. This script may be used to help automate image updates for cisco 2950, 2960, and 3560 series routers and terminal servers.
The switch is in a boot loop and i seem to be unable to recover from it. Lets say you forgot to install the new ios and now youre at the boot loader because the tar file isnt bootable, its just a container for the ios bin and the web based device. If you switch happens to be a 3560v2 there are some 15 code images you can download. How and why you should verify ios images on cisco routers. The boot loader performs lowlevel cpu initialization, performs post, and loads a. For catalyst me3750, the issue will be fixed in 12. Oct 10, 2011 im looking at adding a cisco 3750x switch running c3750euniversalk9mz.
For that, i will show you how to upload the image so you are not waiting hours to copy an image at 9600 baud. In the field you may find yourself faced with a cisco switch that cannot boot up or crashes when booting up due to a possible ios image corruption. The proper command is this one, run in configure terminal mode. Good morning, i updated the firmware of my switches 3750 x 19 switches in 8 stack group with the new version. Cisco 3750 ios image download for gns3 lab topology.
Before changing the boot information, verify the current configuration. Beginning in privileged exec mode, follow these steps to change directories. Recovering a corrupt cisco ios image on a catalyst switch. It starts to decompress and install the ios 2 times, after the second try it displays unable to boot and the switch goes in bootloadermode. Jumped the gun and did not read op before commenting. This name does not change if you upgrade the software image. When there is no ios image, it will boot into rommon. However, it may happen that for various reasons the. Now, what if it is really bad the ios image is corrupt and you can only boot to the switch. Howto upgrade your stackable 3750 with limited service. Catalyst 3750e and catalyst 3750x run the universal image. The bootstrap program looks for the first ios image on the flash memory, extracts it into ram and boots the ios image.
The configuration guide tells me to connect my pc to the switch via the management port but my management port isnt configured with an ip address so theres no way for me to. This happens when trying to upgrade to cisco ios release 12. And all of the documentation i found references the boot command to select which image to boot, even a cisco wiki page for the 3750 which i suspect was wrong about this. Rebooting the switch resolves the issue for the me3750. This appendix describes how to manipulate the catalyst 3750x or 3560x. It seems that the bootloader doesnt geht upgraded and thats why the switch cant boot the new image. If configregister is set to a different value, you can change it with the issue of. Cisco a 3750x switch unable to boot welcome to stardust.
I am having a bit of an issue with a 375048ps switch. Catalyst 2970, 3550, 3560 and 3750 series switches. The bootloader performs lowlevel cpu initialization, performs post, and loads a. Catalyst 3750 switch software configuration guide, 12. Ea1c im sorry to ask these seemingly inane questions but my problem is that i do not have a 3750 available in my lab to test with, and i will have to upgrade code during a window without onsite support. I remember that the process of recovering a missing or corrupt ios on a cisco switch can be a timeconsuming process and the last time i had done it i had to use windows and hyperterminal to send the image to a cisco switch in rommon mode. Gns3 the software that empowers network professionals. The switch will boot up and you should see the switch prompt as shown below. The configuration file is now reloaded, and you can change the password.
Unplug the switch power cord, and press the switch mode button while reconnecting the power cord. The last octet in the configuration register must be set to 2, or the router will ignore the boot system commands completely. Solved cisco 375048ps reboot loop networking spiceworks. The cisco catalyst 3750 ip services ips image has the highest priority, followed by cisco catalyst 3750 switches with ip base software image ipb.
However, once we replaced them with 3850s, weve noticed that rdp sessions that go to both our remote site, as well as rdp sessions that come in via pptp to our windows ras box will. The second one doesnt ever boot to the point where it displays anything on the console. Lets say you have cisco fixed switch 2960, 3560, etc and you copied over the tar file with an ios upgrade, removed the old ios, and rebooted the switch. As long as you have the ip helper address and your vlans can route between each other i. I was able to complete the standard passwordconfig reset procedure on one without any issues boot it, put it into express config mode, telnet in, reset the passwords, etc. Know that the show boot command output does show the new image for the boot pathlist config, however, the cisco catalyst 3560 does not load the new ios image from flash when the reload command is issued. Cisco 2960 troubleshooting of boot errors, flash deleted. Catalyst 3750 x and 3560 x switch command reference ol2152201 appendix a catalyst 3750 x and 3560 x switch boot loader commands boot related commands command description set sets the boot environment variable to boot a specific image when the boot keyword is appended to the command. Loads a default operating system software image into memory and boots up the switch.
Catalyst 3750x and 3560x switch command reference, release. Noticed that the ios version was the 1st one out of 18 revisions available. Catalyst 3750 software upgrade in a stack configuration with use. I accidentally deleted the ios on my new switch and hoped someone could tell me how to recover it. When catalyst fixed configuration switches experience boot errors. This example uses two cisco catalyst 3750 switches configured in. In this case, the image has a bad checksum or a failed software. If there is none, it will show you a wizard asking you if you want to configure the router. This can come in real handy if you are onsite and the compact flash of the router is bad. Connect the cisco serial console cable 9 pin connector to the windows 7 computer serial com port. I have captured the logs during boot and attached below. Step 9 copy the software image from the tftp server to the switch. It seems that the bootloader doesnt geht upgraded and.