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Frame-Relay Back to Back

Written by Rene Molenaar on . Posted in Frame Relay

Scenario

You are working for a huge international car company as the senior network engineer. You need to connect a new branch office to the Headquarters. Since the company believes in proven technology they want you to connect the 2 sites by using Frame-Relay without a Frame-Relay switch.

Goal:

  • You are not allowed to use the 'Frame-Relay Switching' command on any router.
  • Configure Frame-Relay encapsulation on both Routers.
  • Configure the IP addresses as specified in the topology picture.
  • Use the DLCI numbers as specified in the topology picture.
  • Achieve IP connectivity across the frame-relay link.

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

Frame-Relay Back to Back

Video Solution:

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Comments (8)

  • avatar
    Kader
    2010-08-24 10:18:06

    Hi

    If we are connecting Point-to-Point connection and enable the encapsulation as FR and in this case what is the use DLCI.Please explain

    Thanks
    KD

  • avatar
    ReneMolenaar
    2010-08-25 23:07:01

    Good question!

    Keep in mind the DLCI is a layer 2 identifier for frame-relay, just like a MAC address is for Ethernet.

    Frame-relay needs to map IP addresses (layer3) to a DLCI (layer2), and you are unable to use an empty value for DLCI. The DLCI's make up the 'logical link' aka the PVC.

    You also don't send Ethernet frames on a LAN with empty mac addresses, even if it's p2p. If you want to get funky you could create multiple PVC's over this single physical p2p link...

    Kind Regards,

    Rene


  • avatar
    frogger79
    2010-09-10 02:56:23

    Maybe I'm wrong but the lab says to use the DLCI numbers specified (102 and 201) but in a back to back frame relay connection, don't the DLCI numbers need to be the same?

    I tried this out and could only get it to work when the DLCI numbers were the same. Am I missing something?

  • avatar
    ReneMolenaar
    2010-09-10 12:56:55

    Hi Bob,

    You are completely right, the DLCI numbers have to be same.

    I just changed it.

    Thanks!

    Rene

  • avatar
    talaltk
    2010-11-17 16:25:01

    interface Serial0/0
    no ip address
    encapsulation frame-relay
    no keepalive
    serial restart-delay 0
    !
    interface Serial0/0.1 point-to-point
    ip address 192.168.12.2 255.255.255.252
    frame-relay interface-dlci 102

  • avatar
    talaltk
    2010-11-17 16:26:05

    Bumblebee

    interface Serial0/0
    no ip address
    encapsulation frame-relay
    no keepalive
    serial restart-delay 0
    !
    interface Serial0/0.1 point-to-point
    ip address 192.168.12.1 255.255.255.252
    frame-relay interface-dlci 102

  • avatar
    francois van abkoude
    2011-04-02 20:05:24

    bumblebee#
    interface Serial0/0
    ip address 192.168.12.1 255.255.255.252
    encapsulation frame-relay
    no keepalive
    serial restart-delay 0
    frame-relay map ip 192.168.12.2 102
    frame-relay interface-dlci 102
    no frame-relay inverse-arp
    !
    ironhide#
    interface Serial0/0
    ip address 192.168.12.2 255.255.255.252
    encapsulation frame-relay
    no keepalive
    serial restart-delay 0
    frame-relay map ip 192.168.12.1 102
    frame-relay interface-dlci 102
    no frame-relay inverse-arp
    !

  • avatar
    stemrikar
    2012-04-05 10:02:16

    Good Challenging task!!!