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In this post we are going to see how to configure Frame Relay Point to Point, Multi Point with Sub Interfaces 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)#encapsulation frame-relay
HO(config-if)#no shutdown
HO(config-if)#exit

HO(config)#interface serial 1/0.23 multipoint
HO(config-subif)#ip address 20.0.0.1 255.0.0.0
HO(config-subif)#frame-relay interface-dlci 102
HO(config-subif)#frame-relay interface-dlci 103
HO(config-subif)#no shutdown
HO(config-subif)#exit

HO(config)#interface serial 1/0.4 point-to-point
HO(config-subif)#ip address 90.0.0.1 255.0.0.0
HO(config-subif)#frame-relay interface-dlci 104
HO(config-subif)#no shutdown
HO(config-subif)#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




In Router BO3,

BO3(config)#interface fastethernet2/0
BO3(config-if)#ip address 50.0.0.1 255.0.0.0
BO3(config-if)#no shutdown
BO3(config-if)#exit

BO3(config)#interface serial 1/0
BO3(config-if)#ip address 90.0.0.2 255.0.0.0
BO3(config-if)#encapsulation frame-relay
BO3(config-if)#no shutdown
BO3(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


Qemu4 Confguration,

tc@box:~$
tc@box:~$ sudo su
root@box:~#ifconfig eth0 50.0.0.10 netmask 255.0.0.0 up
root@box:~#route add ip default gw 50.0.0.1
root@box:~#route add default gw 50.0.0.1




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 make PVC between HO to BO1,HO to BO2,HO to BO3.


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)#frame-relay route 104 interface serial 1/3 401
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

FRSW(config)#interface serial 1/3
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 401 interface serial 1/0 104
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
HO(config)#ip route 50.0.0.0 255.0.0.0 90.0.0.2


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
BO1(config)#ip route 50.0.0.0 255.0.0.0 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
BO2(config)#ip route 50.0.0.0 255.0.0.0 20.0.0.1


In Router BO3,

BO2(config)#ip route 10.0.0.0 255.0.0.0 90.0.0.1
BO2(config)#ip route 30.0.0.0 255.0.0.0 90.0.0.1
BO2(config)#ip route 40.0.0.0 255.0.0.0 90.0.0.1




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

ping 50.0.0.10


Step 8:Now go to router BO1 and ping the BO2 and BO3 ip address that is 20.0.0.3 and 90.0.0.2 we can't get reply until we add ip address to BO1,BO2 and BO3 using 'frame-relay map'.Router HO knows where the ip 20.0.0.2,20.0.0.3 and 90.0.0.2.But router BO1 doesn't know the ip address of BO2 and BO3 and BO2 Doesn't know how to communicate with BO1 and BO3 without knowing where its present.


In Router BO1,

BO1(config)#interface ser1/0
BO1(config-if)#frame-relay map ip 20.0.0.3 201
BO1(config-if)#frame-relay map ip 90.0.0.2 201



In Router BO2,

BO2(config)#interface serial 1/0
BO2(config-if)#frame-relay map ip 20.0.0.2 301
BO2(config-if)#frame-relay map ip 90.0.0.2 201



In Router BO3,

BO2(config)#interface serial 1/0
BO2(config-if)#frame-relay map ip 20.0.0.2 401
BO2(config-if)#frame-relay map ip 20.0.0.3 401



Now ping ip address of BO2 and BO3 from BO1,


ping 20.0.0.3

Ping 90.0.0.2






Troubleshooting commands,


HO#show frame-relay map
Serial1/0.23 (up): ip 20.0.0.2 dlci 102(0x66,0x1860), dynamic,
              broadcast,, status defined, active
Serial1/0.23 (up): ip 20.0.0.3 dlci 103(0x67,0x1870), dynamic,
              broadcast,, status defined, active
Serial1/0.4 (up): point-to-point dlci, dlci 104(0x68,0x1880), broadcast
          status defined, active



HO#show frame-relay pvc

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

              Active     Inactive      Deleted       Static
  Local          3            0            0            0
  Switched       0            0            0            0
  Unused         0            0            0            0

DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1/0.23

  input pkts 1             output pkts 1            in bytes 34
  out bytes 34             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 00:02:54, last time pvc status changed 00:02:35

DLCI = 103, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1/0.23

  input pkts 1             output pkts 1            in bytes 34
  out bytes 34             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 00:02:57, last time pvc status changed 00:02:38

DLCI = 104, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial1/0.44

  input pkts 1             output pkts 5            in bytes 34
  out bytes 1743           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 5         out bcast bytes 1743
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
  pvc create time 00:02:59, last time pvc status changed 00:02:40

HO#show frame-relay lmi
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
Serial1/0       104             Serial1/3       401             active
Serial1/1       201             Serial1/0       102             active
Serial1/2       301             Serial1/0       103             active
Serial1/3       401             Serial1/0       104             active



In Rotuer BO1,

BO3#show frame-relay map
Serial1/0 (up): ip 20.0.0.2 dlci 401(0x191,0x6410), static,
              CISCO, status defined, active
Serial1/0 (up): ip 20.0.0.3 dlci 401(0x191,0x6410), static,
              CISCO, status defined, active
Serial1/0 (up): ip 90.0.0.1 dlci 401(0x191,0x6410), dynamic,
              broadcast,, status defined, active


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