Change SSH Version

[James Davies]

I have 2 core switches, that are using ssh v1.5 and need to change it to V2 so that a monitoring tool can login, if I change the version during office hours, will I need to regenerate RSA keys etc? or will this be done on the fly?

[Marvin Rhoads · Accepted solution]

No new keys or restart required. Just enter "ip ssh version 2" from configuration mode and save.

All new connections will then be V2 (assuming the connecting client is capable - otherwise their connections will be refused).

I put it on all my deployments and have yet to see a problem with it.

[James Davies]

Thankyou Marvin, appreciated.

[James Davies]

Hi Marvin,

I tried "ip ssh version 2" but its asking me to generate new keys, I assume I can just do a "crypto key generate rsa" ?

[Marvin Rhoads]

If there was no valid existing key found that would be the error you'd generally see.

Generating a new key would be done with the command you mentioned.

[James Davies]

all good, all working. Thank you