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

By Cisco · Question Mode

QuestionQ43

Routing Policy and Manipulation

Question Image

A network engineer has divided an AS into confederations. Because of the repeated ASN, when the 10.0.0.0/8 prefix from R1 reaches R2, BGP automatically rejects it. What should the engineer do to resolve the issue so BGP permits that prefix on R2?

  • A Configure the command as-override on R1.
  • B Configure the command allowas-in on R2.
  • C Configure the command allowas-in on all the PE routers.
  • D Configure the command as-override on R2.
Explanation

BGP normally rejects an update when its own ASN appears in the AS path, preventing routing loops. Configuring allowas-in on R2 allows it to accept the prefix even though ASN 64536 appears in the received AS path.

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