Advanced EIGRP - Route Summarization

3 important questions on Advanced EIGRP - Route Summarization

What is an optional option for the ip summary-address EIGRP command and what does it do?

The 'Leak-map route-map-name' is an optional parameter.
Routes in the route map are advertised togethether with the summary route and even though they are summarized.

In EIGRP, what is a Summary Discard Route?

It is a route installed on summarizing routers as a loop-prevention mechanism.
It installs a Null0 route to the summary destination so packets are discarded if a longest match is not made.

What metric is used for a Summary Route?

The router uses the metrics from the component route with the lowest metrics.

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