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

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QuestionQ165

MPLS and Segment Routing

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Refer to the exhibit. All backbone interfaces in the network are in VRF_MPLS, and ip rsvp signaling hello is already configured on every MPLS router in the network. After R2 was upgraded and its configuration was restored from backup, RSVP signaled that the tunnel from R1 had been torn down. The network engineer verified IP reachability throughout the backbone network. Which action must the engineer take to resolve the issue?

  • A Configure ip rsvp listener outbound reply 172.16.10.1 vrf VRF_MPLS under the global configuration on R2.
  • B Configure ip rsvp signaling hello refresh interval 20 under the interface Gi0/0 configuration on R1.
  • C Configure ip rsvp udp neighbor 172.16.10.1 vrf VRF_MPLS under the global configuration on R2.
  • D Configure ip rsvp udp-multicasts 172.16.10.2 vrf VRF_MPLS under the interface Gi0/0 configuration on R1.
Explanation

RSVP signaling hellos require R2 to process and send RSVP control packets to R1 through the correct VRF. Configuring R1 (172.16.10.1) as an RSVP-over-UDP neighbor in VRF_MPLS restores the RSVP hello adjacency whose loss caused the LSP teardown. Cisco documents ip rsvp udp neighbor as the global command for enabling RSVP control-packet communication with a neighbor and supports a VRF parameter.

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