I am looking to setup a point-to-point T3 connection between our Cisco 2821 and Cisco 3640 routers using the internal NM-1T3/E3 cards. I have the cards installed and the controller has been loaded. However, I am not too familiar with configuring T1 or T3 connections. Despite assigning the IP addresses on each interface and having them advertised using EIGRP, are there any other steps I need to take? The current connection between these two devices are two T1 connections that are load-balanced. My plan was to simply assign the IPs on the T3 serial interface, make sure the networks are advertised via EIGRP, and then shut off the T1 connections. Is there anything more I am missing or need to configure?