Lab Presentation

This image represents the correct topology (without errors) that you should obtain after debugging.

Within each Autonomous System (AS), routers should be configured in a full-mesh iBGP.

Each router should advertises its loopback address as a BGP prefix.

This lab contains a preconfigured network infrastructure, but several intentional errors have been introduced. It's up to you to identify and fix them!

Diagnostic Tools

vtysh is the unified command-line interface of FRRouting (the routing software used in the containers).

It allows you to configure and inspect all routing protocols (BGP, OSPF, RIP, etc.) from a single interface.

Useful commands for diagnosing BGP:

# Access vtysh on r5
root@r5:/# vtysh
r5#

# All following commands are run inside vtysh

# Displays the active BGP configuration
show running-config

# Display BGP neighbor summary (session status)
show bgp ipv6 summary

# Display the complete BGP routing table (learned routes)
show bgp ipv6 unicast

# Display routes specific to a neighbor
show bgp ipv6 neighbors <IP> routes

Recommended Approach

1. Explore the topology

   Examine the lab.conf file to understand which containers are defined and how they are connected. Use the image above to visualize the connections.

2. Connect to containers

   Use Kathara to start the lab and connect to each router/container:

   cd ./variant_X
   
   # Start the lab, automatically opens terminals
   kathara lstart
   
   # Open a terminal
   kathara connect [node_name]
   
   # Remove containers
   kathara wipe
   

3. Inspect the configuration

4. Fix the errors

   📌 Important Rules:

   • ❌ Do not modify the lab.conf file (it is correct and contains no errors)
   • ❌ Do not create new files (all corrections are made in existing files)
   • ✅ Respect the exact folder structure of the provided archive (relative paths are important)

   Modify the files and report these changes to the corresponding files on your host machine (those that will be re-archived).

5. Validate your fixes locally

   cd ./variant
   python3 -m kathara_lab_checker --config correction.yaml --no-cache --lab .
   # or
   kathara_lab_checker --config correction.yaml --no-cache --lab .
   

6. Submit your solution

   Once all tests pass locally (remember to add more), compress the entire variant_X folder into a .zip file and upload it below.