Triggered updates, also known as flash updates, are very simple: If a metric changes for better or for
worse, a router will immediately send out an update without waiting for its update timer to expire.
Reconvergence will occur far more quickly than if every router had to wait for regularly scheduled
updates, and the problem of counting to infinity is greatly reduced, although not completely eliminated.
Regular updates may still occur along with triggered updates. Thus a router might receive bad
information about a route from a not-yet-reconverged router after having received correct information
from a triggered update. Such a situation shows that confusion and routing errors may still occur while an
internetwork is reconverging, but triggered updates will help to iron things out more quickly.
A further refinement is to include in the update only the networks that actually triggered it, rather than the
entire route table. This technique reduces the processing time and the impact on network bandwidth.