Why is FastCli faster than Cli?
Why is FastCli faster than Cli?
FastCli utilizes an always-running agent to process the submitted command and return the output, making it faster than Cli, which might have to initialize a session each time a command is executed.
This may not be correct. They are now the same speed.
Answer A describes the way Fastcli is working. Accord to Arista Warrior Book cli is a pointer to Fastcli Now https://books.google.com/books/about/Arista_Warrior.html?hl=de&id=8QegDwAAQBAJ
FastCli is considerably faster since it does not spawn an entire Cli session to execute the command
Old question. Like @ChrisVic said, both are the same now. FastCli was a faster version of the Cli tool. In the pre 4.16. X EOS versions, If you ran a show version command using the Cli tool it was up to 20x slower than using the FastCli tool. However, in more recent EOS versions the FastCli and Cli tools are exactly the same