I have a 2620 with a 4 port serial module. I also have 3 2501 routers that I want to use to create a frame relay in my lab. Following the guide here on techexams, will using the frame-relay switching command kill the normal routing that i'm using with the ethernet or can they coexist. I want to still use fa0/0 which i have setup as "a router on a stick" and run the serial ports as a frame relay. Can this be done?