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

By Cisco · Question Mode

QuestionQ598

Layer 3 Technologies

Refer to the exhibit. R2 is a route reflector, while R1 and R3 are route-reflector clients. The route reflector learns the route to 172.16.25.0/24 from R1, but does not advertise it to R3.

What is the reason that the route is not advertised?

Question Image

  • A R2 does not have a route to the next hop, so R2 does not advertise the prefix to other clients.
  • B Route reflector setup requires full IBGP mesh between the routers.
  • C In route reflector setup, only classful prefixes are advertised to other clients.
  • D In route reflector setups, prefixes are not advertised from one client to another.
Explanation

R2 preserves the iBGP-learned next hop of 209.165.200.225. Because it has no route to that next hop, the path is not selected as the BGP best path, as indicated by the absence of the > best-path marker. A route reflector advertises only its best path, so R2 does not reflect this prefix to R3.

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