4A0-C03: Nokia NRS II Composite Exam: IS-IS versionDemo

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QuestionQ20

Border Gateway Protocol Fundamentals for Services

Assuming CE1 advertises its system address using BGP, is a routing policy needed on PE1 to advertise CE1's system address to PE2?

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  • A Yes. A routing policy is required to advertise routes between PE routers in a VPRN regardless of the CE-PE routing.
  • B Yes. A routing policy is required in this case because BGP is used as the PE-CE routing protocol.
  • C No, a routing policy is not required. By default, the Nokia 7750 SR will advertise all VPRN routes between PE routers.
  • D No, a routing policy is not required on PEI, but an import policy is required on PE2.
Explanation

On the Nokia 7750 SR, advertisement of routes from a VPRN's local route table to other PE routers via MP-BGP is controlled by the VRF route-target association by default, independent of which protocol (BGP, OSPF, RIP, or static) is used between the PE and the CE to populate that route table. An explicit vrf-export routing policy is only needed to filter, modify, or otherwise restrict what would already be advertised by default, not to enable basic route advertisement between PEs, so using BGP as the PE-CE protocol does not by itself create a requirement for an additional routing policy.

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