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

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QuestionQ185

MPLS and Segment Routing

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Refer to the exhibit. An enterprise runs OSPF within its network, and Cisco Express Forwarding is enabled on all router-to-router links. Network users report that they cannot reach application servers connected to R1. During troubleshooting, a network engineer examined the MPLS forwarding table and found that labels are absent on the link between R1 and R4. What action must the engineer take to resolve the issue?

  • A Configure the OSPF router ID on R1 and R4 as a loopback interface with a /32 mask.
  • B Place the R1-R2 and R1-R4 links into area 0.
  • C Implement a virtual link from R1 to either R2 or R4 so that R1 can connect to area 0.
  • D Enable LDP on the link between R1 and R4.
Explanation

LDP must be enabled on a directly connected MPLS interface so adjacent routers can establish an LDP session and distribute label bindings. Enabling Cisco Express Forwarding alone does not enable MPLS forwarding or LDP on individual interfaces. Area 2 is valid because R2 and R4 connect that area to the OSPF backbone.

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