🧪 Lab 02 · BGP Unnumbered (BGP over IPv6 Link-Local RFC 5549)¶

✅ Validated on Arista cEOS 4.32.0F.

Time: ~45 minutes · Tools: BGP Unnumbered, Extended Next Hop (RFC 5549 / RFC 8950)

Quick Start — Step-by-Step Execution Guide (Location: labs/ipv6-lab/)

Step 1 · Deploy the Lab Fabric (if not already running)

cd labs/ipv6-lab
sudo containerlab deploy -t topology.clab.yml --max-workers 1

Step 2 · Launch the Fully Guided Interactive Walkthrough

./run.sh --guided

Alternative Execution Options (Automated Push or Manual CLI)

Fast Automated Script Push:

./run.sh 01          # apply + verify step 01 automatically
./run.sh --all       # run all steps in order

Manual Line-by-Line CLI Execution: Interactive CLI shell on any container node:
```
docker exec -it clab-ipv6-lab-leaf1-v6 Cli
```

🧠 Technology Deep Dive: BGP Unnumbered (RFC 5549 / RFC 8950)¶

In traditional BGP topologies, every point-to-point interface requires IP address assignment (/30 or /31 in IPv4, /64 or /127 in IPv6).

BGP Unnumbered uses IPv6 Link-Local addresses (fe80::/10) auto-generated via EUI-64 to establish eBGP sessions. RFC 5549 / RFC 8950 extends BGP so that IPv4 and IPv6 prefixes are advertised over an IPv6-only link-local transport:

interface Ethernet1
   ipv6 enable
!
router bgp 65000
   neighbor Ethernet1 interface remote-as 65001
   !
   address-family ipv4
      neighbor Ethernet1 activate

✅ DONE when show bgp summary displays BGP sessions established over interface Ethernet1 via IPv6 Link-Local addresses.