OSPF: Incremental SPF

Every time a topology change occurs the SPF algorithm is run to always produce the best path to a destination, however depending on the location of the topology change SPF will recompute parts of the topology that didn’t change.  Causing unnecessary computations to be performed on parts of the network that have nothing to do with the topology change.

To assist with this the SPF calculation can be changed so that after a topology change, only the affected part of the SPF tree is recalculated.  This is referred to as incremental SPF and can be activated using the ispf command under the OSPF configuration.

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