It is fine to use subinterfaces on R1 and R2 (in fact it is best practice to use point to point subinterface for Frame Relay). But I do not believe that you can do subintefaces on the router that is acting as the switch. I believe that the key elements of the router as frame relay switch include: frame-relay switching (which you have), Frame-relay intf-type dce (which you have), and Frame-relay route 16 interface s1/1 20 (which you need to add in place of the subinterfaces with DLCI identifier).
Does this then mean that for a home lab set-up it is not possible to create a lab exercise using frame-relay subinterfaces on R1 if that router is connected to another router, on say S0/0, which is configured as a F-R switch?
I see many examples of Frame Relay but almost all assume the frame-relay is already preconfigured and working!
I believe that your original post described the situation in terms of R1 and R2 routers configured for Frame Relay and using R3 as the Frame Relay switch. In that situation R1 and R2 can certainly configure Frame Relay with point to point subinterfaces. As I said in my response I do not believe that it is possible to use subinterfaces on the router which is acting as the Frame Relay switch.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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