Perhaps your router didn’t have enough memory to store the old IOS image and the new IOS image.
Save the Configuration and Reload the Router. Verify the Cisco IOS Image in the File System with MD5īoot system flash: show run | include boot. Verify that the TFTP Server has IP Connectivity to the Router by pinging. Backup the startup-configuration to the TFTP server. Save the running configuration on the router to the startup-configuration. If the router doesn’t have enough memory for both IOS images, save a copy of the existing IOS image to the TFTP server. If the router has enough memory, keep the old IOS image on the router and upload the new IOS image. Use the command “dir flash:” to view the contents and free space. Identify the File System to Copy the Image. 
Download the Cisco IOS Software Image to the TFTP Server.Ensure the new IOS supports all the features of the current IOS.Ensure the new IOS supports all the interfaces and modules on the router.Ensure the router has sufficient memory for the new image.Install or Upgrade a Cisco IOS image via TFTP
MD5 is a way to verify the integrity of an IOS image by using a hash. The most commonly used protocol is TFTP. Several protocols are available to copy the Cisco IOS image into a Cisco router. And at that point, there's not much point in getting it to download the config automatically, since I've got to manually config the dhcp anyway (and one more "copy tftp run" command isn't that much more effort).TFTP, FTP and SCP are protocols that can be used to upgrade and recover Cisco IOS images. The other issue I ran into was that, in order to have a switch obtain an address via DHCP (so that it can interact with the tftp server), I've needed to manually configure the interface (in my case VLAN 1) so that it uses DHCP. I've heard that it's possible, but I've thought of a few issues when thinking about how this would be implemented.įirst thing is how to configure a switch so that it knows to download the config the moment it's connected to the network (is there a way to have the tftp server push the config when it detects a new switch connected?). As the title says: I'm looking for a way to configure a network where, when a switch is connected it will automatically download a config from a TFTP server (I'm using two catalyst 3750s at the moment, with a windows device running the tftp server)
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