I recently took CCND1 and 2. I understand that for a router serial interface configuration I need to use the "interface serial X/X" command, along with the chosen IP address and associated mask, and so on. In fact, I had done so in a similar configuration on a 2811 once before with success.
I recently was tasked with configuring a similar interface for another 2811; the new serial interface will be using slot 1, as slot 0 is in use with a dual T1 card. The new card is a dual port T1 as well.
My problem is that, upon looking at the running config of the router, the person who configured it used the "controller T1" command as well. Back in ICND, we didn't touch on the "controller" command, so I am not sure why or if is needed, and why.
Can anyone shed some light into this?
Thanks in advance,