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Configure Frame Relay Switching on a Cisco router

10/16/2011 By Andrew Roderos Leave a Comment

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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!

Disclosure

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Filed Under: General Tagged With: Cisco, IOS

About Andrew Roderos

I am a network security engineer with a passion for networking and security. Follow me on Twitter, LinkedIn, and Instagram.

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