How to create NBMA Cisco Lab (Frame Relay Switch) using GNS3

Non-broadcast Multi Access (NBMA)

A NBMA is a network in which multiple hosts (routers) are attached using private virtual circuit (PVC), but data will transmitted either point-to-point or multipoint in frame relay technology.

For LAB first I will show the topology of this and the logical picture how we have you connect that router using frame relay switch.

From Above picture we will achieve point-to-point and multipoint connectivity from NMBA.

This is logical view of that topology in other word we are going achieve this thing from above picture.

Now we have to connect R1, R3 and R4 using multipoint frame relay PVC connected. R1 is connected with R2 using point-to-point PVC and R2 is connected with R4 using point-to-point PVC with a single interface on each router that is Serial interface.

Now let see the frame relay configuration on GN3.

Place a frame relay switch to your working area and double click on that frame relay switch for configuration.

Now let see how to configure dlci values on that switch for routers in our LAB in next picture. We have create some standard to create dlci values if we want to talk with R1 from R2 we will use dlci value 102 (1 will the source router and 2 will be destination router) and same dlci values are used using same standard.

In this picture you can see we have created dlci values for example for interface 1 on frame relay switch we have 3 dlci values for each router.

For Router two we have two dlci values because its already have a dlci value for interface 1.

Same for other interfaces you have to configure that frame relay switch.

Now we have understand our LAB we can go for configuration on routers. I am using Cisco Router 3660 with NM4T is enable on each router that will provide you 4 Serial interfaces but we will only use one interface Serial 1/0 (router interface id can be change).

Configuration on Router 1:

R1>en
R1#conf t
R1(config)#interface Serial 1/0
R1(config-if)#encapsulation frame-relay
R1(config-if)#no frame-relay inverse-arp
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#

Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#interface serial 1/0.134 multipoint
R1(config-subif)#frame-relay map ip 12.1.1.3 103
R1(config-subif)#frame-relay map ip 12.1.1.4 104
R1(config-subif)#ip address 12.1.1.1 255.255.255.248
R1(config-subif)#exit

Configure on Router 2:

R2>en
R2#conf t
R2(config)#interface Serial 1/0
R2(config-if)#encapsulation frame-relay
R2(config-if)#no frame-relay inverse-arp
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#

R2(config)#interface Serial 1/0.204 point-to-point
R2(config-subif)#frame-relay interface-dlci 204
R2(config-fr-dlci)#ip address 11.1.1.102 255.255.255.252
R2(config-subif)#exit
R2(config)#

Configure on Router 3:

R3>en
R3#conf t
R3(config)#interface Serial 1/0
R3(config-if)#encapsulation frame-relay
R3(config-if)#no frame-relay inverse-arp
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#

R3(config)#interface Serial 1/0.134 multipoint
R3(config-subif)#frame-relay map ip 12.1.1.1 301
R3(config-subif)#frame-relay map ip 12.1.1.4 304
R3(config-subif)#ip address 12.1.1.3 255.255.255.248
R3(config-subif)#exit

Configure on Router 4:

R4>en
R4#conf t
R4(config)#interface Serial 1/0
R4(config-if)#encapsulation frame-relay
R4(config-if)#no frame-relay inverse-arp
R4(config-if)#no shutdown
R4(config-if)#exit
R4(config)#

R4(config)#interface Serial 1/0.402 point-to-point
R4(config-subif)#frame-relay interface-dlci 402
R4(config-fr-dlci)#ip address 11.1.1.104 255.255.255.252
R4(config-subif)#exit
R4(config)#

Now ping from every router to check that interface is up or not If you receive time out message from ping command that verify the dlci values.

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Tags: Cisco frame relay LAB, Cisco Lab, frame relay configurtion, GNS3 frame relay configuration, NBMA