Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 44

Table 2. Pin Assignments Between the Console and a DTE Terminal Server Console Port Signal RJ-45 to RJ-45 Rollover RJ-45 to RJ-45 Rollover RJ-45 to DB-9 Adapter Cable Cable RJ-45 Pinout RJ-45 Pinout DB-9 Pin RTS 1 8 8 NC 2 7 6 TxD 3 6 2 GND 4 5 5 GND 5 4 5 RxD 6 3 3 NC 7 2 4 CTS 8 1 7 Terminal Server Device Signal CTS DSR RxD GND GND TxD DTR RTS Accessing the CLI Interface and Running Scripts Using SSH In addition to the capability to access a device using a console connection or a Telnet session, you can also use SSH for secure, protected communication with the device. You can open an SSH session and run commands or script files. This method of connectivity is supported with S4810, S4048-ON, S3048-ON, S4820T, and Z9000 switches and provides a reliable, safe communication mechanism. Entering CLI commands Using an SSH Connection You can run CLI commands by entering any one of the following syntax to connect to a switch using the preconfigured user credentials using SSH: ssh username@hostname or echo | ssh admin@hostname 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 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. 44 Getting Started