If I have three routers R1, R2, and R3 that are interlinked, then when configuring, do I have to give the command:
description Link to R2 description Link to R3
when configuring R1?
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A router will function the same with or without interface descriptions. It is a very good practice to add interface descriptions because that can help you later on when you have forgotten how you connected things. It is a good habit to develop.
Also, when you ask for help from someone not familiar with your network (such as here), having descriptions on the interfaces will go a long way.
Description is just a commenta given by respective engineer for future acknowledgments and for easy understanding to know on this interface which device is connected . Description can be anything it might be comment or ticket number it's upto team to remember for future acknowledgments
Router(config)# int ethernet F0/1 Router(config)# description " cosole access"
Like this network engineers have feasible to add description to interface for future acknowledgments.