How-to: Configure Frame-relay Switching Switching, Configure

Routers can be configured as Frame Relay switches to be used mostly in service provider or LAB environments. Lets see how you can configure frame-relay switch to use your in studies.
On a Frame Relay switch, frames from a Frame Relay PVC arriving o n an incoming interface are switched to a Frame Relay PVC o n an outgoing interface. The switching paths taken by the frames are based o n the static Frame Relay route table.
In the following example two routers (Router1 & Router2) are connected via a router acting as a dedicated frame-relay switch (FRSW) .

Configuration steps:

• Enable frame relay switching o n FRSW using the global command frame-relay switching.
• Configure the frame-relay switch interfaces to act as a DCE interface using the command frame-relay intf-type.
• Configure a frame relay PVC o n FRSW to switch packets coming from DLCI 100 o n Serial1/0 to DLCI 200 o n Serial1/1.
• Configure typical frame relay o n both routers (Router1 & Router2).
• Verify and check the operation.

Frame-relay switch configuration:

1. FRSW(config)#frame-relay switching
   
2. FRSW(config)#interface s1/0
   
3. FRSW(config-if)#description Connection to Router1
   
4. FRSW(config-if)#encapsulation frame-relay
   
5. FRSW(config-if)#frame-relay intf-type dce !–act as a switch connected to router
   
6. 
   
7. !–specify a static route PVC switching.
   
8. FRSW(config-if)#frame-relay route 100 interface serial 1/1 200
   
9. FRSW(config-if)#clock-rate 128000
   
10. FRSW(config-if)#interface s1/1
    
11. FRSW(config-if)#description Connection to Router1
    
12. FRSW(config-if)#encapsulation frame-relay
    
13. FRSW(config-if)#frame-relay intf-type dce
    
14. FRSW(config-if)#frame-relay route 200 interface s1/0 100
    
15. FRSW(config-if)#clock-rate 128000
    

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Router1 & Router2 configuration:
This is a basic frame relay configuration using main serial interfaces and all defaults.

1. 
   
2. 
   
3. 
   
4. 
   
5. Router1(config)#int s1/0
   
6. Router1(config-if)#encap frame-relay
   
7. Router1(config-if)#ip address 12.12.12.1 255.255.255.0
   
8. Router1(config-if)#no shut
   
9. 
   
10. Router2(config)#int s1/0
    
11. Router2(config-if)#encap frame-relay
    
12. Router2(config-if)#ip address 12.12.12.2 255.255.255.0
    
13. Router2(config-if)#no shut
    

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Verification and troubleshooting:
The following show commands were taken from the frame relay switch “FRSW” and Router1

1. 
   
2. FRSW#sh frame-relay route
   
3. Input Intf Input Dlci Output Intf Output Dlci Status
   
4. Serial1/0 100 Serial1/1 200 active
   
5. Serial1/1 200 Serial1/0 100 active
   
6. 
   
7. FRSW#sh frame-relay pvc | in DLCI
   
8. DLCI = 100, DLCI USAGE = SWITCHED, PVC STATUS = ACTIVE, INTERFACE = Serial1/0
   
9. DLCI = 200, DLCI USAGE = SWITCHED, PVC STATUS = ACTIVE, INTERFACE = Serial1/1
   
10. Verification from Router1 point of view “same is done o­n Router2″
    
11. Router1#ping 12.12.12.2
    
12. Type escape sequence to abort.
    
13. Sending 5, 100-byte ICMP Echos to 12.12.12.2, timeout is 2 seconds:
    
14. !!!!!
    
15. Success rate is 100 percent (5/5), round-trip min/avg/max = 24/60/132 ms
    
16. Router1#show frame-relay map
    
17. Serial1/0 (up): ip 12.12.12.2 dlci 100(0×64,0×1840), dynamic,
    
18. broadcast,, status defined, active

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