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

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QuestionQ37

Routing Policy and Manipulation

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Refer to the exhibit. A network operator must inject a Level 1 route from XR2 (10.16.16.0/24) into the IS-IS topology. Which configuration permits the injection so that XR3 and XR1 have a valid, functioning route to 10.16.16.0/24?

  • A
  • B
  • C
  • D
Explanation

IS-IS automatically propagates Level 1 routes into Level 2. To advertise the resulting Level 2 route to XR1’s Level 1 domain, XR3 must be configured to propagate Level 2 into Level 1. The route-policy range 10.0.0.0/8 ge 8 le 32 includes 10.16.16.0/24, whereas a maximum prefix length of 22 would exclude it. Cisco IOS XR identifies Level 2-to-Level 1 propagation as route leaking and requires explicit configuration.

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