Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 49)

Feature support for Telnet
The following features are not supported with Telnet:
• Displaying Telnet sessions
• Terminating hung Telnet sessions
Feature support for SSH
SSHv2 is the supported version of SSH, but not all features typically available with SSHv2 are
supported on the Brocade VDX family of switches.
The following encryption algorithms are supported:
• 3des Triple-DES (default)
• aes256-cbc : AES in CBC mode with 256-bit key
• aes192-cbc : AES in CBC mode with 192-bit key
• aes128-cbc : AES in CBC mode with 128-bit key
The following HMAC (Hash-based Message Authentication Code) message authentication algorithms
are supported:
• hmac-md5 : MD5 encryption algorithm with 128-bit key (default).
• hmac-md5-96 : MD5 encryption algorithm with 96-bit key.
• hmac-sha1 : SHA1 encryption algorithm with 160-bit key.
• hmac-sha1-96: SHA1 encryption algorithm with 96-bit key.
SSH user authentication is performed with passwords stored on the device or on an external
authentication, authorization, and accounting (AAA) server.
The following features are not supported with SSH:
• Displaying SSH sessions
• Deleting stale SSH keys
Firmware upgrade and downgrade considerations with Telnet or SSH
Downgrading the firmware on a switch to a Network OS version earlier than 4.0 is not allowed when
either the Telnet server or the SSH server on the switch is disabled. To downgrade to a lower version,
both the Telnet Server and SSH Server must be enabled.
Upgrading to Network OS 4.0 or later is automatically allowed because the Telnet server and SSH
server status are enabled by default.
For more information, refer to Installing and Maintaining Firmware on page 111.
Using DHCP Automatic Deployment (DAD)
DHCP Automatic Deployment (DAD) is a method used to bring up the switch with new firmware or a
preset configuration automatically.
DHCP Automatic Deployment (DAD) is a method used to bring up the switch with new firmware or
preset configuration automatically.
In Network OS 4.1.0 and later, you can automatically bring up a switch with new firmware or a preset
configuration, omitting the need for logging in to the switch console to configure the switch. If you are in
standalone mode or fabric cluster mode, you can apply either the default configuration or a preset
Feature support for Telnet
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