This week we covered "centralised" routing - two aspects:
Fibbing - hybrid of SDN/central controller and distributed computation using link-state
(note on terminology. )
If you are interested in how to replicate state machines, have a look at this work on distributed consensus . Noting that these replication schemes themselves are very subtle and difficult to get right.
MPLS - and segment routing - which is somewhat stateful forwarding, which therefore requires some input from some controller or management plane to do anything other than default paths (if MPLS or SR just use the IGP to setup labels/segements, you just get whatever the IGP does, so kind of making the use of MLPS or SR rather pointless).
Some useful backup material on segmenet routing, operationally from Juniper Networks
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