Thanks Uffe! It's a simple network but it'll teach you everything you need to know about EBGP.
EBGP - External BGP
Scenario:
Textilalicious is a large international company specialized in selling Wool, Silk, Cotton and Flax. Each region is specialized in selling a different type of textile. To support the growth of the company network your boss has decided to use BGP to connect the different regions together. You just finished studying BGP for your CCNP ROUTE exam so your boss agrees to let you configure this network.
Goal:
- All IP addresses have been preconfigured for you as specified in the topology picture.
- Configure EBGP between AS 1 and AS 2.
- Configure EBGP between AS 2 and AS 3. You are not allowed to use the IP addresses on the physical interfaces to configure the BGP neighbor adjacency.
- Configure EBGP between AS 3 and AS 4.
- Advertise the loopback interfaces in BGP and ensure you have full reachability for this network.
IOS:
c3640-jk9o3s-mz.124-16.bin
Topology:
Video Solution:
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Comments (7)
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uscallesen 2011-09-07 12:11:07Another great lab (Good job on sneaking in small problems, despite a few apparently simple goals - I wont post any spoilers
)
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ReneMolenaar 2011-10-01 15:47:03Thanks, I'll keep working until everything is at CCIE R&S level. I've been working on building new BGP labs and it will take some time to catch up with everything.
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raf 2011-10-01 07:34:36Thanks for making video. Pls keep making no matter basic or advanced. Good job
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bongklah 2012-03-21 21:54:39Hi Rene,
I am unsure why the ebgp-mulithop was used in this exercise. What is the purpose of this command option? The iBGP lab used loopbacks as their neighbors but did not require using ebgp-mulithop. Can you please explain this for my understanding?
Thank you,
Bong
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ReneMolenaar 2012-04-02 09:36:20
Hello Bong,
By default EBGP routers will send IP packets with a TTL of 1. This means you can only configure EBGP neighbor adjacencies using the IP addresses on the directly connected interfaces.
If you want to configure EBGP between loopback interfaces you'll need to use the EBGP multihop command.
IBGP does not have this "restriction" so we don't have to use a multihop command for this.
Rene
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zaidi 2012-05-18 14:38:35nice..thank you :-)