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The SSH server transmits the terminal commands to the CLI shell and the results are displayed on the screen
non-interactively.
Executing Local CLI Scripts Using an SSH
Connection
You can execute CLI commands by entering a CLI script in one of the following ways:
ssh username@hostname <CLIscript.file>
or
cat < CLIscript.file > | ssh admin@hostname
The script is run and the actions contained in the script are performed.
Following are the points to remember, when you are trying to establish an SSH session to the device to run
commands or script files:
•
There is an upper limit of 10 concurrent sessions in SSH. Therefore, you might expect a failure in
executing SSH-related scripts.
•
To avoid denial of service (DoS) attacks, a rate-limit of 10 concurrent sessions per minute in SSH is
devised. Therefore, you might experience a failure in executing SSH-related scripts when multiple short
SSH commands are executed.
•
If you issue an interactive command in the SSH session, the behavior may not really be interactive.
•
In some cases, when you use an SSH session, when certain show commands such as show tech-
support produce large volumes of output, sometimes few characters from the output display are
truncated and not displayed. This may cause one of the commands to fail for syntax error. In such cases,
if you add few newline characters before the failed command, the output displays completely.
Execution of commands on CLI over SSH does not notice the errors that have occurred while executing the
command. As a result, you cannot identify, whether a command has failed to be processed. The console
output though is redirected back over SSH.
Default Configuration
Although a version of Dell Networking OS is pre-loaded onto the system, the system is not configured when
you power up the system first time (except for the default hostname, which is Dell). You must configure the
system using the CLI.
Configuring a Host Name
The host name appears in the prompt. The default host name is Dell.
•
Host names must start with a letter and end with a letter or digit.
Getting Started
53
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Troubleshooting
