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In this post we are going to see how to configure Frame Relay Multi Point topology using cisco router as frame relay switch in GNS3.



Step 1:Create topology like this,






Step 2:Configure routers Ho and BO1 and BO2 with configurations given below,


In Rotuer HO global config mode,

HO(config)#interface fastethernet2/0
HO(config-if)#ip address 10.0.0.1 255.0.0.0
HO(config-if)#no shutdown
HO(config-if)#exit

HO(config)#interface serial 1/0
HO(config-if)#ip address 20.0.0.1 255.0.0.0
HO(config-if)#encapsulation frame-relay
HO(config-if)#no shutdown
HO(config-if)#exit


In Router BO1 global config mode,

BO1(config)#interface fastethernet2/0
BO1(config-if)#ip address 30.0.0.1 255.0.0.0
BO1(config-if)#no shutdown
BO1(config-if)#exit

BO1(config)#interface serial 1/0
BO1(config-if)#ip address 20.0.0.2 255.0.0.0
BO1(config-if)#encapsulation frame-relay
BO1(config-if)#no shutdown
BO1(config-if)#exit


In Router BO2 global config mode,

BO2(config)#interface fastethernet2/0
BO2(config-if)#ip address 40.0.0.1 255.0.0.0
BO2(config-if)#no shutdown
BO2(config-if)#exit

BO2(config)#interface serial 1/0
BO2(config-if)#ip address 20.0.0.3 255.0.0.0
BO2(config-if)#encapsulation frame-relay
BO2(config-if)#no shutdown
BO2(config-if)#exit


Step 3:Configure host Qemu1,Qemu2 and Qemu3 with appropriate ip address and default gateway


Qemu1 Configuration,

tc@box:~$
tc@box:~$ sudo su
root@box:~#ifconfig eth0 10.0.0.10 netmask 255.0.0.0 up
root@box:~#route add ip default gw 10.0.0.1
root@box:~#route add default gw 10.0.0.1

Qemu2 Configuration,

tc@box:~$
tc@box:~$ sudo su
root@box:~#ifconfig eth0 30.0.0.10 netmask 255.0.0.0 up
root@box:~#route add ip default gw 30.0.0.1
root@box:~#route add default gw 30.0.0.1



Qemu3 Confguration,

tc@box:~$
tc@box:~$ sudo su
root@box:~#ifconfig eth0 40.0.0.10 netmask 255.0.0.0 up
root@box:~#route add ip default gw 40.0.0.1
root@box:~#route add default gw 40.0.0.1



Step 4:Enable Frame Relay in Router FRSW,Command to Enable Frame Relay in Router is

FRSW(config)#frame-relay switching


Step 5:Now configure the interface serial1/0,serial 1/1 and Serial 1/2 with this command to configure PVC between HO to BO1 and HO to BO2,


In FRSW global Config mode,

FRSW(config)#interface serial 1/0
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 102 interface serial 1/1 201
FRSW(config-if)#frame-relay route 103 interface serial 1/2 301
FRSW(config-if)#no shutdown
FRSW(config-if)#exit

FRSW(config)#interface serial 1/1
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 201 interface serial 1/0 102
FRSW(config-if)#no shutdown
FRSW(config-if)#exit


FRSW(config)#interface serial 1/2
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 301 interface serial 1/0 103
FRSW(config-if)#no shutdown
FRSW(config-if)#exit


Step 6:Now configure static route all routers like below,

In Router HO,

HO(config)#ip route 30.0.0.0 255.0.0.0 20.0.0.2
HO(config)#ip route 40.0.0.0 255.0.0.0 20.0.0.3


In Router BO1,

BO1(config)#ip route 10.0.0.0 255.0.0.0 20.0.0.1
BO1(config)#ip route 40.0.0.0 255.0.0.0 20.0.0.1


In Router BO2,

BO2(config)#ip route 10.0.0.0 255.0.0.0 20.0.0.1
BO2(config)#ip route 30.0.0.0 255.0.0.0 20.0.0.1


Step 7:Now go to the host in network 10.0.0.0 and ping the other hosts in network 30.0.0.0 and 40.0.0.0

ping 30.0.0.10

ping 40.0.0.10


Step 8:Now go to router BO1 and ping the BO2 ip address that is (20.0.0.3)we can't get reply until we add ip address to BO1 using 'frame-relay map' command with BO2 ip address.Same as in BO2 with BO1 ip address.Router HO knows where the ip 20.0.0.2 and 20.0.0.3.But router BO1 doesn't know the ip address of BO2 and BO2 Doesn't know the ip address of BO1.


In Router BO1,

BO1(config)#interface ser1/0
BO1(config-if)#frame-relay map ip 20.0.0.3 201

In Router BO2,

BO2(config)#interface serial 1/0
BO2(config-if)#frame-relay map ip 20.0.0.2 301

Now ping ip address of BO2 from BO1,

ping 20.0.0.3







Troubleshooting commands,


HO#show frame-relay map
Serial1/0 (up): ip 20.0.0.2 dlci 102(0x66,0x1860), dynamic,
              broadcast,, status defined, active
Serial1/0 (up): ip 20.0.0.3 dlci 103(0x67,0x1870), dynamic,
              broadcast,, status defined, active




HO#show frame-relay pvc

PVC Statistics for interface Serial1/0 (Frame Relay DTE)

              Active     Inactive      Deleted       Static
  Local          2            0            0            0
  Switched       0            0            0            0
  Unused         0            0            0            0

DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1/0

  input pkts 11            output pkts 13           in bytes 1074
  out bytes 1168           dropped pkts 0           in pkts dropped 0
  out pkts dropped 0                out bytes dropped 0
  in FECN pkts 0           in BECN pkts 0           out FECN pkts 0
  out BECN pkts 0          in DE pkts 0             out DE pkts 0
  out bcast pkts 2         out bcast bytes 68
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
  pvc create time 00:11:12, last time pvc status changed 00:10:12

DLCI = 103, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1/0

  input pkts 6             output pkts 6            in bytes 554
  out bytes 554            dropped pkts 0           in pkts dropped 0
  out pkts dropped 0                out bytes dropped 0
  in FECN pkts 0           in BECN pkts 0           out FECN pkts 0
  out BECN pkts 0          in DE pkts 0             out DE pkts 0
  out bcast pkts 1         out bcast bytes 34
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
  pvc create time 00:11:14, last time pvc status changed 00:09:35


HO#show frame-relay lmi

LMI Statistics for interface Serial1/0 (Frame Relay DTE) LMI TYPE = CISCO
  Invalid Unnumbered info 0             Invalid Prot Disc 0
  Invalid dummy Call Ref 0              Invalid Msg Type 0
  Invalid Status Message 0              Invalid Lock Shift 0
  Invalid Information ID 0              Invalid Report IE Len 0
  Invalid Report Request 0              Invalid Keep IE Len 0
  Num Status Enq. Sent 105              Num Status msgs Rcvd 77
  Num Update Status Rcvd 0              Num Status Timeouts 28


HO#debug frame-relay lmi
HO#debug frame-relay packet
HO#debug frame-relay


In FRSW,


FRSW#show frame-relay route
Input Intf      Input Dlci      Output Intf     Output Dlci     Status
Serial1/0       102             Serial1/1       201             active
Serial1/0       103             Serial1/2       301             active
Serial1/1       201             Serial1/0       102             active
Serial1/2       301             Serial1/0       103             active



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