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.