It wasn’t great to have a bunch of typing be wasted when an error occurred. You entered all the commands and when you pressed CTRL-Z, the file was parsed and any errors were displayed. ![]() The end of the input was indicated with CTRL-Z. He told me that he needed the ability to change the configuration at a trade show, so he added a quick hack to allow him to type the configuration into a buffer, which was passed to the function that parsed the TFTP file. According to Kirk Lougheed, one of the founders of Cisco, it was only intended to have its configuration loaded via TFTP. The original Cisco router didn’t even have a CLI. A teletype (as stolen from )įor the record, very early versions of the Cisco CLI used the “line printer” idea to input configuration commands. That’s why Cisco continues to call a terminal session a line. ((and yes, I have used these devices when I was at University, they really did exist)). If you made a mistake you had to delete the entire line, type it again and hope it was right. That’s because you had to type an entire line and press enter before the printer would print it. Oh yeah, and the very early models where called LINE PRINTERS. ((Is that just cheap or good for customers, hard to say)) I guess Cisco never got around to changing it. So when Cisco IOS was first started out, it was based on a OS that still regarded these keyboard/printers as the only way to I/O the system. Screen to display characters were invented much later. When you pressed a key, the character was printed on paper. Teletype refers to the days when computers were programmed by character based printers, literally, a keyboard attached to a printer. So what’s vty then ? A teletype! Are you kidding? The following is conjecture on my part, I have no actual proof that this is true but it seems highly likely. Footnote: Apocryphal Note on VTY for younger people Thatís what we say, and thatís what you should say. ![]() And they typically say ìI will terminal into the routerî, or possibly “I will telnet to the router” or even “I will SSH into the router”.Īnd when you are connecting the the blue serial cable, you typically say ìI am consoling into the boxî. Most people also call the software on their desktop, their ìTerminal Programî or similar. ![]() You say Terminal Program not Console Program VTYĪ VTY is term used by Cisco to describe a single terminal (whereas Terminal is more of a verb or general action term). Terminal is USUALLY a more broad term for BOTH CONSOLE and MONITOR. In rather special circumstances, the Monitor can also be known as the “VTY”. Monitor is a telnet / SSH session, but can sometimes be known as the Terminal ((there are good reasons for this, but they are historical so no-one cares anyway. ConsoleĬonsole as meaning serial connection when you connect the console cable to the device, and the serial port to your laptop / computer. Herewith is the official Ethereal Mind definition for each term. That way, I will like you better and we won’t make mistakes. ![]() Lets cover this syntax so that you can speak the same language as me. When you are connecting to your Cisco IOS router, we use a number of different terms for ALMOST the same thing. IOS speak- Monitor, Terminal, VTY or Console ?
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