Figure 819 Counting to infinity with three gateways

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Split horizon logic would be ineffective in this scenario due to the time delay before routes can be invalidated. RIP uses a different technique, known as a triggered update, to accelerate convergence. A triggered update is a rule in the protocol that requires gateways to immediately broadcast an update message whenever it changes a route metric, regardless of how much time remains in the 30-second update timer.

The previous sections demonstrated how time is the Achilles heel of split horizons, with or without reverse poisoning. Triggered updates are designed to overcome this vulnerability by reducing time delay to an absolute minimum.

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