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

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QuestionQ160

MPLS and Segment Routing

Refer to the exhibit.

Question Image

Question Image

VPN users connected to PE routers are experiencing network issues. Traffic originating from CE1 is dropped before it reaches CE2. An engineer observes no outgoing traffic statistics on the PE1 and PE2 routers toward CE devices and determines that PE1 is running the older software image. Which action must be implemented to resolve the issues?

  • A Enable LDP protocol on PE1 and PE2 routers.
  • B Advertise P1 router loopback on PE1 in OSPF.
  • C Enable CEF-based forwarding on PE1 router.
  • D Advertise PE2 router loopback on PE1 in OSPF.
Explanation

MPLS label switching on Cisco routers requires Cisco Express Forwarding (CEF). PE1 has MPLS forwarding-table entries but no usable outgoing label or interface action, causing packets from CE1 to be dropped. Enabling CEF-based forwarding on PE1 permits the router to perform MPLS label forwarding toward CE2.

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