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

By Cisco · Question Mode

QuestionQ518

VPN Technologies

Which configuration must the network engineer apply to bypass the AS_PATH loop-prevention mechanism in IP/VPN hub-and-spoke deployment scenarios?

  • A Use allowas-in at the PE_Hub.
  • B Use allowas-in and as-override at all PEs.
  • C Use allowas-in and as-override at the PE_Hub.
  • D Use as-override at the PE_Hub.
Explanation

BGP AS-path override on the hub PE replaces the customer site ASN in advertisements sent toward the hub CE. This prevents the receiving CE from finding its own ASN in the AS_PATH and rejecting the route under normal BGP loop prevention.

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