I have a frame-relay small network with a star topology. Core router is a 3640 and 7 branches use 1750.
Core router has 7 subinterfaces point-to-point configured in one an interface.
5 branches have subinterfaces in their interface and 2 use the interface without explicit subinterface.
Routing alghorithm is RIP 2, no special configuration is in place, mostly use default, including the reverse ARP.
The problem is: core router is not receiving branches routers advertisements. But each branch receives advertisements from core router.
I posted this question before, receiving two advices. First was "use broadcast option" and second "neighbor option".
I tried both but things did not change.
I would like to get some help for this.