As a small challenge for our weekly study group, I created a small three-task mini scenario for IS-IS. It helped me to check my knowledge on my IS-IS studies, since the topic was quite new to me. It led to some great discussions and I thought it might be useful for other folks preparing for the CCDE exam. If you want to get my solutions, feel free to ping me via LinkedIn. https://www.linkedin.com/in/paul-freitag-436653192/ I value your opinion and look forward to discuss with you. You can also use the comments below. Link to PDF scenario (google drive)

In our recent CCDE study group meeting, we covered 6PE (IPv6 Provider Edge). This method integrates IPv6 into an IPv4 MPLS network. Yet, we were unsure of its operation and use. To clarify, I set up an EVE-NG environment and ran a lab test. The key point is that 6PE setups do not use VRFs on PE routers. Instead, they place all CEs in the global routing table. VRFs help isolate customer traffic. This setup prevents unauthorized interference. In L3VPN networks, people usually combine VRFs with MPLS and MP-BGP. But why would you use 6PE in your MPLS network? Your core MPLS network is running IPv4 only, and you cannot change it that easy. You might not need traffic segmentation. You deliver internet service via global routing table to the customers So for a better understanding, let's check the lab topology. We have our IPv4 MPLS network, which uses OSPFv2 as underlay routing and LDP for label exchange. On top, we're running BGP between the loopback IPs of the PE routers. P-Router ...