Principles of Communications Week 2, L2, 12.10.2021

 Recommend revisiting 1B networking lecture on Link State Routing and Longest Prefix Matching - see pp 25 onwards, and pp 141 onwards - relates both to fibbing (IGP is typically link state) and to MPLS (trying to avoid longest prefix matching by using fixed length labels instead).

Note: MPLS requries a setup, either management (controller/SDN like) or implicit from routing, or a signaling protocol (e.g. RSVP - see later lectures) - clearly, only management or signaling could add the details for FEC->PHB mapping for performance. willentail other algorithms (e.g. some sort of account of topology & capacity of links) to compute whether performance can be met (see later) - similar for protection, which might need multiple runs (e.g. k-shortest paths) of dijkstra...