I will use the following LAB which simulates hub-n-spoke topology, were R1 is the hub and R2-3-4 are spokes:
The object FR is a Cisco 3745 router which I configured in the following manner in order to convert him into a FR switch:
FR(Config)# frame-relay switching
This command enables FR switching on the router
interface Serial0/0
no ip address
encapsulation frame-relay
clock rate 2000000
frame-relay intf-type dce
frame-relay route 102 interface Serial0/1 201
frame-relay route 103 interface Serial0/2 301
frame-relay route 104 interface Serial0/3 401
For the hub interface (s0/0) I have configured encapsulation type which is frame-relay, frame-relay interface type which is DCE and frame-relay route commands which define where to route the traffic that enters the DLCI. For example the first route line define that if traffic is enter in DLCI 102 route it to interface Serial 0/1 DLCI 201.
Next the spoke interface for R2:
interface Serial0/1
no ip address
encapsulation frame-relay
clock rate 2000000
frame-relay intf-type dce
frame-relay route 201 interface Serial0/0 102
Again – encapsulation type (FR) and interface type (DCE) and route statement which route traffic that enters into this interface, to DLCI 201 will be route to interface serial 0/0 DLCI 102.
The same goes for the 2 more interfaces:
interface Serial0/2
no ip address
encapsulation frame-relay
clock rate 2000000
frame-relay intf-type dce
frame-relay route 301 interface Serial0/0 103
!
interface Serial0/3
no ip address
encapsulation frame-relay
clock rate 2000000
frame-relay intf-type dce
frame-relay route 401 interface Serial0/0 104
Type show frame-relay route command on the FR router will shows:
FR#show frame-relay route
Input Intf Input Dlci Output Intf Output Dlci Status
Serial0/0 102 Serial0/1 201 active
Serial0/0 103 Serial0/2 301 active
Serial0/0 104 Serial0/3 401 active
Serial0/1 201 Serial0/0 102 active
Serial0/2 301 Serial0/0 103 active
Serial0/3 401 Serial0/0 104 active
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