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

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QuestionQ85

MPLS and Segment Routing

A regional service provider provides connectivity for a growing enterprise, which recently acquired a new location in a nearby city. The new location, which is connected at CE2, requires connectivity to the company's data center, which is connected to CE1. The service provider will use VPNv4 to connect the two locations.

The networking team is planning to implement segment-routing traffic engineering to route traffic from PE1 to PE2 over a delay-optimized path through P2.

Which action must the engineering team take to begin the implementation?

Question Image

  • A Implement a GRE tunnel between PE1 and PE2
  • B Implement BGP peering between PE1 and P2 using IPv4.
  • C Implement SR within the service provider network using IS-IS only.
  • D Implement a BGP extended community for routes between CE1 and CE2.
Explanation

Segment Routing must first be enabled within the service provider's core network using the IGP (in this case IS-IS) before any SR-TE policy can be built. Enabling SR in IS-IS allows the network to advertise Prefix-SIDs and Adjacency-SIDs for all nodes and links, establishing the SR-enabled MPLS forwarding plane. This foundational step is required before an explicit, delay-optimized SR-TE path through P2 can be engineered from PE1 to PE2 to carry the VPNv4 traffic.

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