you ll need a back to back cable. the terminating ends of the cable depends on what router, wic you are using.
For example. if you are using 3 2600s, with a wic-2t, with smart serial connector (small thin connector), then you need a back to back cable with smart serial connectors on either ends (one end DTE and other end DCE).
if you plan to use a wic-1t with db60 connector, then you need a back to back cable with db60 connector on either ends (one end DTE and other end DCE)
You can get some of these cables off ebay.com or www.anthonypanda.com. A 3ft cable might cost you 18 bucks +s/h.
once the cables are connected, the router's with the DCE end of the cables should be configured with clocks.
For this you can use commands,
Router(config-if)#clock rate 56000.
You can use default encapsulation of HDLC on these interfaces. To turn on eigrp.
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