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OSPF Over Frame-Relay: Non-Broadcast

Written by Rene Molenaar on . Posted in OSPF

Scenario:

As the senior network engineer for a Dutch fishing company you are responsible for connecting all the different branch offices to the main network. The WAN technology you are using is Frame Relay, and you need to run OSPF over this WAN connection. One of the restrictions is that you are unable to send broadcast traffic on this frame-relay link.

Goal:

  • The frame-relay switch has been preconfigured for you, as you can see in the topology picture the following PVC's has been configured:

    Router Barracuda to Salmon:
    Barracuda: DLCI 102
    Salmon: DLCI 201

    Router Barracuda to Herring:
    Barracuda: DLCI 103
    Salmon: DLCI 301

  • Router Barracuda is the "Hub" router and the other 2 routers are the "Spoke" routers.
  • Do not change any configuration on the Frame-Relay switch.
  • Configure the following IP addresses:
    Router Barracuda:
    S0/0: 192.168.123.1 /24
    L0: 1.1.1.1 /24

    Router Salmon:
    S0/0: 192.168.123.2 /24
    L0: 2.2.2.2 /24

    Router Herring:
    S0/0: 192.168.123.3 /24
    L0: 3.3.3.3 /24
  • Configure all serial interfaces for encapsulation Frame-Relay.
  • Disable Frame-relay inverse arp on all serial interfaces.
  • Configure the correct frame-relay map statements on all routers and make sure you can ping every IP address. You are not allowed to use the "broadcast" command.
  • Configure the OSPF network type to "non-broadcast" on all serial interfaces.
  • Configure OSPF on all 3 routers, make sure you have full connectivity. All IP addresses including the loopbacks should be reachable.
  • Make sure router Salmon and Herring can never be the Designated or Backup designated router.

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

OSPF Network Type Non-Broadcast Frame Relay

Video Solution:

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Comments (8)

  • avatar
    mukuljoshi86

    Need more complex topology ;)

  • avatar
    mukuljoshi86

    can u give us some more topology i mean different than hub and spoke!!

  • avatar
    ReneMolenaar

    Well the frame-relay topologies aren't too difficult, you have the following choices:

    - Point-to-Point
    - Hub and Spoke
    - Partial-Mesh
    - Full-Mesh

    The hub and spoke is usually the hardest in combination with OSPF/Multicast...is there any particular topic/topology you are looking for?

  • avatar
    krastin

    Just a heads-up on the final answers - it's the wrong zip file, the one from the NSSA lab.

    Greets!

  • avatar
    ReneMolenaar

    Thanks Krastin,

    I'll fix it.

    Rene

  • avatar
    willtech10577

    guys is it just me or do you get to the part of the lab where Rene pings all other devices -- it works for him in the video but not for me.

    did a "sh frame-relay map" and the other devices show as INACTIVE.

    I'll play with the FRSW config but if anyone already fixed this please do post! ;)

  • avatar
    willtech10577

    hey guys -- figured out what was missing from the FRSW.cfg file.

    Add "clockrate 56000" to the serial interfaces and then the routers can ping each other.

  • avatar
    ReneMolenaar

    Hi William,

    You sure about that? Clockrate is something you don't have to configure in GNS3 normally...it works out of the box.

    By the way a better method to check the layer 2 stuff on frame-relay is using "show frame-relay route" on the switch and "show frame-relay pvc" on the hub and spoke routers.

    Frame-relay map will give you the layer 2 to 3 information...it will help you as well but looking at the pvc shows if you receive anything through LMI or not.