QuestionQ14

Routing Policy and Manipulation

Refer to the exhibit. What relationship exists between Router 1 and Router 2?

Question Image

  • A Router 1 centrally learns the topology of the network to aid in SR-TE path selection, and Router 2 is a node that feeds Router 1 topology information
  • B Router 1 and Router 2 are participating in SR-TE tunnels and are both head-end routers
  • C Router 1 and Router 2 centrally learn the topology of the network to aid in SR-TE path selection for peers
  • D Router 2 is the head-end router in an SR-TE tunnel, and it is learning topology of the network from the PCE enabled on Router 1
Explanation

A PCE centrally collects network topology information to compute SR-TE paths. IS-IS distribute link-state exports IS-IS nodes, links, and prefixes to BGP-LS, and the BGP-LS neighbor to the PCE address supplies that topology to the PCE. Router 2 is therefore a topology-information source for Router 1.

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