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

By Cisco · Question Mode

QuestionQ233

Unicast Routing

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Using the exhibit, an engineer at a large ISP is troubleshooting suboptimal routing in a customer’s IS-IS network that has multiple Level 1-2 routers. The network includes numerous routers configured for MPLS. When IS-IS selects the closest Level 1-2 router to leave the area, suboptimal routing results in Area 8 and Area 10. The other IGP protocols operate correctly, and the IS-IS adjacency between routers is established. Which action resolves the issue?

  • A Redistribute Level 2 prefixes into Level 1 on router 2.
  • B Disable advertisement of the default route on router 2.
  • C Configure each interface as either Level 1 or Level 2 circuit type on router 1.
  • D Configure the router as DIS for each of the interfaces on router 1.
Explanation

IS-IS route leaking redistributes Level 2 prefixes into a Level 1 area, so Level 1 routers receive specific interarea routes rather than relying only on the default route to the nearest Level 1-2 router. This enables the router to select the optimal Level 1-2 exit and eliminates the suboptimal routing behavior.

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