While reconfiguring a Cisco switch 3750G WS-C3750G-24TS-S1U with version 12.0(5.3). When attempting to run “crypto key genearte rsa“, it was failing with below error:
MW-CORE-SW01#conf t
Enter configuration commands, one per line. End with CNTL/Z.
MW-CORE-SW01(config)#hostname MWired
MW-CORE-SW01(config)#ip domain-name magwinya.co.za
MW-CORE-SW01(config)#crypto key generate rsa
% Invalid input detected at ‘^’ marker.
Workaround Solution:
In order to run “crypto key generate rsa”, you need an IOS image that contains “k9” in the name.
In our case we had to upgrade IOS boot image to:
c3750-advipservicesk9-mz.122-46.SE.bin
Follow this upgrade guide: Click HERE
Once upgrade is completed, all was in order.
MW-CORE-SW01(config)#crypto key generate rsa
The name for the keys will be: MW-CORE-SW01.magwinya.co.za
Choose the size of the key modulus in the range of 360 to 4096 for your
General Purpose Keys. Choosing a key modulus greater than 512 may take
a few minutes.
How many bits in the modulus [512]: 1024
All the best!
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