BGP Update Source


As the senior network engineer of a international fruit-selling company you need to configure IBGP within the network. Since your manager wants no SPOF (single point of failure) you decide to add another link between the routers, now the only thing left to do is make sure the logical configuration is also redundant…back to work!


  • All IP addresses have been preconfigured for you.
  • Both routers have a loopback interface:
    Router King: L0: /32
    Router Kong: L0: /32
  • Configure EIGRP AS 100 on both routers, advertise all networks.
  • Ensure you have full reachability and can ping both loopbacks.
  • Configure BGP AS 100 on both routers, do not advertise any networks.
  • Make sure that whenever a single link goes down, the BGP neighbor relationship will not reset itself.
  • Try this by first shutting down the FastEthernet link, bring it back up and then try the serial link.

It took me 1000s of hours reading books and doing labs, making mistakes over and over again until I mastered all the routing protocols for CCNP.

Would you like to be a master of routing too? In a short time without having to read 900 page books or google the answers to your questions and browsing through forums?

I collected all my knowledge and created a single ebook for you that has everything you need to know to become a master of routing.

You will learn all the secrets about BGP, why we use loopback interfaces, update source changes and more.

Does this sound interesting to you? Take a look here and let me show you how to Master CCNP ROUTE




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Video Solution:

Configuration Files

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The How to Master series helps you to understand complex topics like spanning-tree, VLANs, trunks, OSPF, EIGRP, BGP and more.

Written by René Molenaar - CCIE #41726

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About the Author: Rene Molenaar

René - CCIE #41726 is the creator of where he shares CCNA, CCNP and CCIE R&S labs. He also blogs about networking on


  1. Glad you like it. If you want a challenge try the BGP Advanced lab. I’m uploading all BGP videos & final configs as i’m typing this.

  2. Dear all,

    I took a different approach on this one. Instead of running and IGP (in this case it’s just 2 routers – in a live environment an IGP is needed – )

    IP SLA with 2 static routers to swap routes if one of the interfaces goes down.

    Pretty simple and straight forward.

    Now I will do the IGP version with no IP SLA.


  3. Dear all,

    Just finished the IGP/BGP version 🙂

    I used variance and max paths in order to have the feasible successor installed to the routing table.

    EIGRP reacted fast enough
    Success rate is 99 percent (994/1000), round-trip min/avg/max = 1/20/60 ms

    EBGP peering did not drop.

    I will now watch your video 🙂

  4. Good Job René,
    Just finished it, very nice and straight forward. I also tried with static routes, works perfect!!!
    But can you tell me in which order a new ccnp route student can take this labs?
    This question applies also for the other topics Labs……Ospf, Eigrp, Rip,………

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