Multihoming and traffic engineering

What you’ll practise

• Use local preference to choose the outbound exit, on one router, for the whole AS
• Use MED to choose between two links to the same provider
• Use AS-path prepending to influence distant networks, on IOS and RouterOS
• Explain why a provider's own local preference beats any prepend you send
• Use provider communities to change a provider's decision
• Keep a multihomed customer from becoming a transit path

The tasks

1. Read the baseline
2. Outbound with local preference
3. Two links to one provider: MED
4. Prepending
5. A provider community
6. The same for the staff block
7. Prove the paths

The Lab Tasks pane has the scenario, these tasks, the checks to run, hints and the full solution.

How to open this lab

1. Sign in to your workspace at lab.cloudlabbox.com.

2. In File Manager, open Shared, then the folder BGP in depth guided labs.

3. Open 07 - Multihoming and traffic engineering and start its nodes, then open Lab Tasks for the scenario and the steps.

The lab is read-only. You can start the nodes and configure the devices, but changes to the topology can’t be saved. To change it, rebuild it in your own folder.