Segment Routing Fundamentals: From MPLS to SRv6

This blog aims to take you on a journey through some fundamental concepts of Segment Routing, highlighting the most important features and looking behind the scenes at the technical implementation. You might ask, “What on earth is a segment?” The answer is simple; a segment is a path in a network from one node to another. To distinguish between multiple segments, each segment is assigned a segment ID (SID). If this sounds a bit abstract, remember that Segment Routing is a packet-switching concept whose fundamental principle is to route packets through the network via a sequence of segments. The packets thus include a list of SIDs in the correct order, and once a packet has completed a segment, the SID is removed from the list. If you’re wondering what type of network we’re talking about and where such a segment runs, don’t worry!…