In the OSPF process, what is the role of the DETAIL -SUPPRESSED option of the AGGREGATE command?

Question

Options

• ASuppress the generated aggregate routes from being delivered to the IP routing table
• BSuppress the delivery of aggregated detailed routes to the IP routing table
• COnly advertise aggregate routes to other BGP neighbors
• DAdvertise aggregate routes and detailed routes to other BGP neighbors

• A
  14% (4)
• B
  4% (1)
• C
  79% (22)
• D
  4% (1)

Explanation

Note: The question stem says "OSPF process," but the AGGREGATE command with DETAIL-SUPPRESSED is a BGP feature - this is likely a typo in the original question.

Option C is correct because DETAIL-SUPPRESSED (functionally equivalent to summary-only in many implementations) instructs BGP to suppress advertisement of the more-specific (detailed) component routes to BGP neighbors, sending only the aggregate summary route instead. This reduces routing table size on neighbors and controls the granularity of what peers receive.

• A is wrong because the option doesn't suppress the aggregate itself - the aggregate route is generated and advertised; it's the detailed routes that are suppressed.
• B is wrong because the suppression happens at the BGP advertisement level (what peers receive), not at the local IP routing table level - the detailed routes still exist in the local RIB.
• D is wrong because it describes the default behavior of aggregate-address without detail-suppressed; omitting the option causes both the aggregate and the specific routes to be advertised.

Memory tip: Think "DETAIL-SUPPRESSED = details are suppressed from neighbors." The router keeps the details locally but hides them from BGP peers, showing only the summary - like summarizing a report for your boss while keeping the full data for yourself.

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