connecting two routers back to back... connecting two routers back to back... GUJUm0deL (Programmer) (OP) 20 Nov 02 18:33 Hi, i'd like to know of a way to connect a cisco 2500 to a cisco 4500, back to back... Any other way besides using the AUX... Any ideas?? Thanks... I have not failed; I have merely found 100,000 different ways of not succeding... RE: connecting two routers back to back... routerjunky (TechnicalUser) 21 Nov 02 08:35 Depending on what interfaces the 4500 and which model of the 2500 series you have one of the following should work.Method 1If each router has a serial interface connect them via serial cables. Make sure they are of the same EIA standard (ex. RS-232, V.35). One needs to be DCE and the other DTE. On the config make sure the DCE side is supplying clock.Method 2If each router has an ethernet port connect them via a crossover cable.