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

By Cisco · Question Mode

QuestionQ453

Layer 3 Technologies

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Refer to the exhibit. An engineer configured R2 and R5 as route reflectors and observed that not all routes are sent to R1 for advertisement to the eBGP peers.

Which iBGP routers must be configured as route reflectors to advertise all routes and restore reachability across all networks?

  • A R1 and R4
  • B R1 and R5
  • C R4 and R5
  • D R2 and R5
Explanation

Route reflectors relax the normal iBGP rule that prevents a router from advertising iBGP-learned routes to another iBGP peer. Placing the reflectors at R4 and R5 provides the required reflection path across the AS so that all internal routes reach R1 for eBGP advertisement. Cisco documents that route-reflector clients can receive reflected routes without requiring a full iBGP mesh.

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