Configuring Serial Ports in Cisco 2500-series Routers

So, I was trying to connect my 2507 and 2501 routers (DCE is connected to 2507) but something interesting came up today.
I tried to connect the two routers through serial ports (DCE/DTE) but ran into a (trivial) problem.

First, as we know when we want to bring up an interface, then we issue “no shutdown” command in the interface mode configuration. We also know that
show int s0 will show us the information
about the serial port 0.

But the result came up the following: Serial0 is down, line protocol is down.

How to connect to Cisco routers using Minicom

In this tutorial, I am going to show you how to connect to a Cisco router by using Minicom terminal. I am using Linux by the way. If you’re
using Window$, besides the suggestion to dump it out and change it with Linux, I think hyperterminal is still your best option. Just Google it: “How to hyperterminal cisco router”.