The Impact of Summary Routes on Query Scope
Lesson 4: EIGRP Summarized Routes
In addition to EIGRP stub routers, route summarization also limits EIGRP Query scope and therefore improves convergence time. The reduction in Query scope occurs because of the following rule:
If a router receives an EIGRP Query for a prefix/prefix length, does not have an exactly matching (both prefix and prefix length) route, but does have a summary route that includes the prefix/prefix length, that router immediately sends an EIGRP Reply and does not flood the Query ...
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