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

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Refer to the exhibit. An engineer has successfully resolved a BGP peering issue. R1 has established eBGP peerings with R2 and R3. Which mechanism should the engineer apply to steer the traffic correctly?

A The MED attribute can be applied on R2 to influence R1 to use it as the primary path.
B The local preference attribute can be applied on R3 to influence AS 65513 to use AS 65515 as the secondary path.
C The weight attribute can be applied on R2 to influence AS 65513 to use AS 65515 as the primary path.
D The IGP metric can be manipulated on R1 to allow traffic to be load balanced between R2 and R3.

Explanation

MED is advertised to an external BGP peer to express the preferred path into the advertising autonomous system; a lower MED is preferred. Local preference is confined to the local AS, weight is local to the router, and an IGP metric alone does not enable BGP load balancing. MED values from different neighboring ASes require explicit configuration on the receiving router for cross-AS MED comparison.

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Cisco BGP path selection and route preference

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

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