A municipal library consortium summarizes many branch /24s into a /16 toward the core to shrink the civic RIB. What trade-off must designers respect?
Select an answer to reveal the explanation.
Short Explanation
Summarization is packing branch streets into one zip-code sign for the core. The map gets smaller—great—unless a missing side street still falls under that zip and packets fall into a hole. Advertise a summary only when coverage (or Null0 anchoring) matches reality.
Full Explanation
Manual summarization aggregates more-specific prefixes into a shorter mask so upstream routers carry fewer routes. If some constituent prefixes are missing or unreachable while the summary remains, traffic for those holes can be blackholed toward the summarizing router. Null0 anchors and careful addressing plans mitigate that risk. Summaries do not require MPLS and do not disable CEF; validate coverage before advertising the /16 to the civic core.