300-510 SPRI: Implementing Cisco Service Provider Advanced Routing SolutionsDemo

By Cisco · Question Mode

QuestionQ93

Routing Policy and Manipulation

Question Image

Refer to the exhibit. An engineer is troubleshooting this network and observes that prefixes from R3 are absent from R1’s routing table. Because the ASN is repeated, BGP automatically rejects the 10.0.0.0/8 prefix from R3 when it reaches R1. No prefix list on R1 blocks traffic from R3. What should the engineer do to resolve the issue so that BGP permits the prefix on R1?

  • A Configure R2 as a route reflector client of R1.
  • B Configure the next-hop-self command on R2.
  • C Configure the allowas-in command on R1.
  • D Configure identical confederation ASNs on R1 and R2.
Explanation

BGP normally rejects an advertised route whose AS_PATH already contains the receiving router’s local AS, preventing routing loops. The allowas-in command on R1 allows it to accept the R3 prefix even though AS 65000 appears in that path.

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