- Cisco 2960 Version 12.2 Crypto Key Generate Free
- Cisco 2960 Version 12.2 Crypto Key Generate Download
- Cisco 2960 Version 12.2 Crypto Key Generate Rsa
- Cisco 2960 Version 12.2 Crypto Key Generate Rsa Modulus 1024 Command
KB ID 0001246
Problem
I was working on a Cisco 3750-G last week, and I was in the process of setting up SSH access. When I went to generate the crypto key and enable SSH, It fired an error at me. In fact it wouldn’t execute any crypto commands;
Solution
So you can either, just use TELNET to manage the switch, or upgrade it to a K9 version of the code, (in my case c3750-ipserviceslmk9-tar.122-55.SE11). I chose to upgrade.
Upgrade Cisco Catalyst 3750G
First I tried to TFTP in the bin file, but I kept getting a lot of ‘O’ (‘out of sequence’ errors,) and the process failed. After discussions with a colleague, he recommended I simply use the archive-download command and use the TAR upgrade file instead.
Cisco 2960 Version 12.2 Crypto Key Generate Free
WARNING: These old G series switches only have a 16MB flash in them, the TAR file is about 13.5MB you will need to delete the boot file and folder from flash to upgrade the IOS, but I suggest you copy the bin file out to TFTP in case theres a drama, and you need top copy it back in, before you continue. (In fact backup the switch config as well to be on the safe side!)
It can take 10 minutes or so, but when complete, check the boot variable is set to the new image, and then reload the switch (It may restart a couple of times that’s OK).
Related Articles, References, Credits, or External Links
NA
- Direct Console Access: Uses a special serial cable to connect directly to the console port and get a Command Line Interface(CLI) to the device.
- Telnet Access: Remote management of the device from the network. Gives authenticated Command Line access to the device but the whole communication is not encrypted.
- SSH Access: Remote management of the device form the network (just like Telnet) but the whole traffic is encrypted by the SSH protocol.
Disable Telnet on Cisco Routers/Switches
CiscoDevice(config-line)# transport input none
Controlled Access to Telnet
CiscoDevice(config)# access-list 10 permit 192.168.1.0 0.0.0.255
CiscoDevice(config)# line vty 0 15
CiscoDevice(config-line)# access-class 10 in
CiscoDevice(config-line)# password strongtelnetpass
CiscoDevice(config-line)# login
Enable SSH on Cisco Routers/Switches
Cisco 2960 Version 12.2 Crypto Key Generate Download
Cisco 2960 Version 12.2 Crypto Key Generate Rsa
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Cisco 2960 Version 12.2 Crypto Key Generate Rsa Modulus 1024 Command
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