Specifying an SSH VersionThe following example uses the ip ssh server version 2 command to enable SSH version 2 and the show ip ssh command toconfirm the setting.Dell(conf)#ip ssh server version 2Dell(conf)#do show ip sshSSH server : enabled.SSH server version : v2.SSH server vrf : default.SSH server ciphers : 3des-cbc,aes128-cbc,aes192-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr.SSH server macs : hmac-md5,hmac-md5-96,hmac-sha1,hmac-sha1-96,hmac-sha2-256,hmac-sha2-256-96.SSH server kex algorithms : diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1,diffie-hellman-group14-sha1.Password Authentication : enabled.Hostbased Authentication : disabled.RSA Authentication : disabled.Vty Encryption HMAC Remote IPDell(conf)#To disable SSH server functions, use the no ip ssh server enable command.Using SCP with SSH to Copy a Software ImageTo use secure copy (SCP) to copy a software image through an SSH connection from one switch to another, use the following commands.1 On Switch 1, set the SSH port number ( port 22 by default).CONFIGURATION MODEip ssh server port number2 On Switch 1, enable SSH.CONFIGURATION MODEcopy ssh server enable3 On Switch 2, invoke SCP.CONFIGURATION MODEcopy scp: flash:4 On Switch 2, in response to prompts, enter the path to the desired file and enter the port number specified in Step 1.EXEC Privilege Mode5 On the chassis, invoke SCP.CONFIGURATION modecopy scp: flash:Example of Using SCP to Copy from an SSH Server on Another SwitchThe following example shows the use of SCP and SSH to copy a software image from one switch running SSH server on UDP port 99 tothe local switch.Other SSH related command include:• crypto key generate : generate keys for the SSH server.• debug ip ssh : enables collecting SSH debug information.• ip scp topdir : identify a location for files used in secure copy transfer.• ip ssh authentication-retries : configure the maximum number of attempts that should be used to authenticate a user.• ip ssh connection-rate-limit : configure the maximum number of incoming SSH connections per minute.812 Security
