topic If there was no valid in Network Security

Change SSH Version

James Davies — Fri, 21 Feb 2020 13:35:25 GMT

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?

No new keys or restart

Marvin Rhoads — Fri, 25 Sep 2015 12:45:51 GMT

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.

Thankyou Marvin, appreciated.

James Davies — Fri, 25 Sep 2015 12:47:49 GMT

Thankyou Marvin, appreciated.

Hi Marvin,I tried "ip ssh

James Davies — Mon, 28 Sep 2015 08:58:03 GMT

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" ?

If there was no valid

Marvin Rhoads — Mon, 28 Sep 2015 10:58:50 GMT

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.

all good, all working. Thank

James Davies — Mon, 28 Sep 2015 11:25:51 GMT

all good, all working. Thank you