System Management Commands4-414Exampleshow sshUse this command to display the current SSH server connections.Command ModePrivileged ExecExampleConsole#show ip sshSSH Enabled - version 1.99Negotiation timeout: 120 secs; Authentication retries: 3Server key size: 768 bitsConsole#Console#show sshConnection Version State Username Encryption0 2.0 Session-Started admin ctos aes128-cbc-hmac-md5stoc aes128-cbc-hmac-md5Console#Table 4-15. show ssh - display descriptionField DescriptionSession The session number. (Range: 0-3)Version The Secure Shell version number.State The authentication negotiation state.(Values: Negotiation-Started, Authentication-Started, Session-Started)Username The user name of the client.Encryption The encryption method is automatically negotiated between the client and server.Options for SSHv1.5 include: DES, 3DESOptions for SSHv2.0 can include different algorithms for the client-to-server (ctos)and server-to-client (stoc):aes128-cbc-hmac-sha1aes192-cbc-hmac-sha1aes256-cbc-hmac-sha13des-cbc-hmac-sha1blowfish-cbc-hmac-sha1aes128-cbc-hmac-md5aes192-cbc-hmac-md5aes256-cbc-hmac-md53des-cbc-hmac-md5blowfish-cbc-hmac-md5Terminology:DES – Data Encryption Standard (56-bit key)3DES – Triple-DES (Uses three iterations of DES, 112-bit key)aes – Advanced Encryption Standard (160 or 224-bit key)blowfish – Blowfish (32-448 bit key)cbc – cypher-block chainingsha1 – Secure Hash Algorithm 1 (160-bit hashes)md5 – Message Digest algorithm number 5 (128-bit hashes)
