300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

By Cisco · Question Mode

QuestionQ612

Layer 3 Technologies

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Refer to the exhibit. The network administrator configured the Customer Edge router (AS 64511) to advertise only summarized routes toward ISP-1 (AS 100) and ISP-2 (AS 200).

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After this configuration, ISP-1 and ISP-2 still receive both the specific routes and the summary route. Which configuration resolves the issue?

  • A
  • B
  • C
  • D
Explanation

In Cisco BGP, aggregate-address 172.16.20.0 255.255.252.0 summary-only creates the 172.16.20.0/22 aggregate and suppresses advertisement of its more-specific component routes to all BGP neighbors. This leaves ISP-1 and ISP-2 receiving only the summary route.

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