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

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QuestionQ57

Routing Policy and Manipulation

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Refer to the exhibit. A network operator is receiving the route for 10.11.11 0/24 from two upstream providers on #XR3. The network operator must configure #XR3 to force the 10.11.11.0/24 prefix to route through next hop 10.0.0.9 as the primary path when available. Which of these can the operator use in the routing policy language to enforce this traffic-forwarding path?

  • A weight of 0 on the prefix coming from 192.168.0.2
  • B lower local preference on the prefix coming from 192.168.0.2
  • C higher local preference on the prefix coming from 192.168.0.1
  • D weight of 100 on the prefix coming from 192.168.0.1
Explanation

The path from 192.168.0.2 has weight 651, which takes precedence over local preference and causes it to be selected. Setting that path's weight to 0 removes its weight advantage. The remaining shown BGP attributes are equal, and the path associated with BGP router ID 192.168.0.1 is preferred, selecting next hop 10.0.0.9. IOS XR RPL supports setting BGP weight, and a higher weight is selected before other BGP path attributes.

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