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

By Cisco · Question Mode

QuestionQ106

MPLS and Segment Routing

Refer to the exhibit.

Question Image

A network consultant is updating the company's MPLS solution and configuring several new PE devices to enable complete communication among PE devices connected to the network. The updates must provide network redundancy and scalability. The egress LSR is configured with mpls ldp explicit-null. While configuring the specified PE router to be adjacent to the egress LSR, the consultant finds that MPLS forwarding is not functioning in the network. Which action resolves the issue?

  • A Open TCP and UDP ports 179.
  • B Configure Cisco Express Forwarding on all routers in the MPLS network.
  • C Configure MVRF on all routers in the MPLS network.
  • D Open TCP and UDP ports 464.
Explanation

Cisco Express Forwarding is required for MPLS label switching and forwarding. Enabling CEF on all routers that participate in the MPLS network provides the forwarding mechanism required for LDP-distributed labels, including explicit-null label handling.

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