The story of why networks are moving to SRv6, then a real SR OS build in Containerlab with configs, control plane, data plane and live packet captures.
The story: why we are moving to SRv6
For the better part of twenty years, service provider cores ran on MPLS. It worked, and it worked well. But look at what it actually takes to run a modern MPLS network and the picture gets busy fast. You need an IGP to carry reachability. You need a label distribution protocol on top of it, LDP, just to hand out transport labels. If you want traffic engineering you add RSVP-TE, which signals state hop by hop and keeps that state alive on every router along every tunnel. Then you layer BGP on top for the VPN services. That is four control planes stacked on top of each other, each with its own state, its own failure modes, and its own troubleshooting playbook.