Network topology used in this tutorial

A sample hub and spoke network topology is created in Cisco Packet Tracer 8.2 :

  • R0 router is the spoke router
  • R1 and R2 routers are frame-relay spokes
  • All frame relay routers are interconnected through a Cisco Packet Tracer Cloud device which emulates frame relay circuits.

Packet Tracer 8.2 frame relay sample network

 

Frame Relay configuration - WAN cloud

Configure the LMI type and DLCI of virtual circuits for each serial interface of the cloud used for Frame Relay operations.

Create the virtual circuits in the "Frame Relay" tab.

DLCI's need to be configured on each "SerialX" tabs before creating Frame Relay virtual circuits.

Frame Relay configuration - ISR router configuration

Frame relay hub router configuration (R0)

The hub router is configured with two sub-interfaces to create a virtual circuit with each spoke. Each frame relay sub-interface is mapped with the DLCI number of the corresponding circuit configured in the Packet Tracer WAN emulation Cloud. The DLCI number defines a single virtual connection through the WAN and are the Frame Relay equivalent to a hardware address. 

The encapsulation frame-relay command is mandatory on the main serial interface before configuring frame-relay sub interfaces.

The clock rate defines the speed on the serial interface

interface Serial0/0/0
 no ip address
 encapsulation frame-relay
!
interface Serial0/0/0.101 point-to-point
 ip address 192.168.101.1 255.255.255.252
 frame-relay interface-dlci 101
 clock rate 2000000
!
interface Serial0/0/0.102 point-to-point
 ip address 192.168.102.1 255.255.255.252
 frame-relay interface-dlci 102
 clock rate 2000000

Frame relay spoke routers configuration (R1 and R2)

The spoke routers have only one virtual circuit configured to reach the hub router. The DLCI configured on both spoke routers is the same as the DLCI is locally significant between the WAN Cloud and each customer.

Router R1 configuration

interface Serial0/0/0
 ip address 192.168.101.2 255.255.255.252
 encapsulation frame-relay
 frame-relay interface-dlci 100
!

Router R2 configuration

interface Serial0/0/0
 ip address 192.168.102.2 255.255.255.252
 encapsulation frame-relay
 frame-relay interface-dlci 100
!

Video