Centralised (!) Routing - Fibbing (see fibbing paper for more details - esp. figure 9/10 on failure/recovery modes) - in particular, fail-open and fail-close is used in the paper to refer to the persistence of a path made up by fibbing in the event of a controller failure where in some cases this is needed, and in others it needs to be removed! [1,2]
Stateful Routing - MPLS
In a sense, these two ideas (central and stateful) can be reconciled via "soft state" protocols (see last lecture).
further work was done based on the fibbing idea:
Basically, it leverages FIBbing-like mechanisms to optimize (oblivious) TE in IP networks.
This paper is about the hardness of configuring ECMP for TE. This is actually based on a very cute hardness amplification proof technique.
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