Enable SSHv2 on Cisco Router & Switch

Steps to enable SSHv2 on Cisco Router & Switch

1. Define the hostname

2. configure the domain name

3. Specifies the RSA key pair to use for using SSH.
R2(config)#ip ssh rsa key-pair name {key-pair name}
By doing so SSH version 1.5 is deactivated

4. For SSH Version 2, the modulus size must be at least 768 bits.
R2(config)# crypto key generate rsa usage-keys label {keypair-name} modulus 768

4. Enable SSH version 2

5. Check the version with "show ip ssh"