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EIGRP Point-to-Point Bandwidth Pacing

Written by Rene Molenaar on . Posted in EIGRP

Scenario:

A large international ISP has hired you as one of their network engineers. The ISP still has a fairly large customer that is using an older frame-relay network. All of your colleagues are too busy working with MPLS and you are the only one who is capable of fixing frame-relay problems. Whenever router Tilburg is sending major EIGRP updates there are problems with congestion. Think you can tune EIGRP so this network won't have congestion anymore?

Goal:

  • All IP addresses have been preconfigured for you as specified in the topology picture.
  • Every router has a loopback0 interface:
    Tilburg: 1.1.1.1 /24
    NewDelhi: 2.2.2.2 /24
    Berlin: 3.3.3.3 /24
    Paris: 4.4.4.4 /24
    NewYork: 5.5.5.5 /24
  • You are not allowed to make any changes to the frame-relay configurations.
  • In this topology you can see 4 spoke routers but in reality there are 10 spoke routers. I didn't add them all to save CPU power when you run this topology. Each PVC has a CIR of 64kbps.
  • Router Tilburg has a serial interface 0/0 that only has a physical bandwidth of 256kbps.
  • Configure EIGRP AS 1 on all routers and make sure you have full connectivity.
  • Whenever router Tilburg sends EIGRP updates to all spoke routers there is congestion because the physical bandwidth of serial interface s0/0 is only 256kbps.
  • Configure your network so the bandwidth reflects the CIR on the PVCs and EIGRP will only use 50% of the CIR.

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

EIGRP Bandwidth Pacing Network Topology

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Comments (3)

  • avatar
    LEKHRAJ

    i am looking for the sol. of this goal.
    please provide the video solution

  • avatar
    ReneMolenaar

    Hopefully I can record them this week!

  • avatar
    Dardoufa

    Sample config:

    Tilburg:
    on each subinterface bandwidth 25

    On spoke routers:
    bandwidth 64
    ip bandwidth-percent eigrp 1 19

    (25*0.5=12.5 12.5/64=19)

    Correct?