Whether you are building a CCIE home lab or not, this will help you configure a Cisco router to act as a Frame Relay switch.
To better understand the topology of this particular scenario, I attached a Visio diagram below.
Without further ado, here are the commands to turn your Cisco router to a Frame Relay switch.
FR (config)#frame-relay switching ! interface serial 1/1 description R1 to R2 and R1 to R3 encapsulation frame-relay clock rate 128000 frame-relay lmi-type cisco frame-relay intf-type dce frame-relay route 102 interface serial1/2 201 frame-relay route 103 interface serial1/3 301 ! interface serial 1/2 description R2 to R1 encapsulation frame-relay clock rate 128000 frame-relay lmi-type cisco frame-relay intf-type dce frame-relay route 201 interface serial1/1 102 ! interface serial 1/3 description R3 to R1 encapsulation frame-relay clock rate 128000 frame-relay lmi-type cisco frame-relay intf-type dce frame-relay route 301 interface serial 1/1 103 ! end
To verify that this configuration works, let’s configure all three routers and ping the IP of the interfaces.
R1 configuration:
R1 (config)#interface Serial0/0 no ip address encapsulation frame-relay ! interface Serial0/0.102 point-to-point ip address 2.2.2.1 255.255.255.0 frame-relay interface-dlci 102 ! interface Serial0/0.103 point-to-point ip address 3.3.3.1 255.255.255.0 frame-relay interface-dlci 103 ! end
R2 configuration:
R2 (config)#interface Serial0/0 no ip address encapsulation frame-relay frame-relay lmi-type cisco ! interface Serial0/0.201 point-to-point ip address 2.2.2.2 255.255.255.0 frame-relay interface-dlci 201 ! end
R3 configuration:
R3 (config)#interface Serial0/0 no ip address encapsulation frame-relay ! interface Serial0/0.301 point-to-point ip address 3.3.3.3 255.255.255.0 frame-relay interface-dlci 301 ! end
Ping verification:
R1#ping 2.2.2.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 4/15/44 ms R1#ping 3.3.3.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/15/48 ms R2#ping 2.2.2.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2.2.2.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/19/76 ms R3#ping 3.3.3.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 3.3.3.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/23/80 ms
Congratulations, you’ve just configured a Cisco router to act as a Frame Relay switch!
I hope this has been helpful and thank you for reading!
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