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

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QuestionQ260

MPLS and Segment Routing

Refer to the exhibit.

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An engineer is configuring service traffic from router R1 to R6 as shown. What additional configuration must the engineer implement so that the LDP and SR domains can participate and interwork with each other?

  • A Router2(config)# segment-routingRouter2(config-sr)# ldp mapping-serverRouter2(config-sr-ms)# prefix-sid-mapRouter2(config-sr-ms-map)#Router2(config-sr-ms-map-af)# 2.2.2.2/32 500 range 4
  • B Router2(config)# segment-routingRouter2(config-sr)# sr mapping-serverRouter2(config-sr-ms)# ldp-sid-mapRouter2(config-sr-ms-map)# address-family ipv4Router2(config-sr-ms-map-af)# 10.1.1.1/32 500 range 50
  • C Router2(config)# segment-routingRouter2(config-sr)# mapping-serverRouter2(config-sr-ms)# prefix-sid-mapRouter2(config-sr-ms-map)# address-family ipv4Router2(config-sr-ms-map-af)# 10.1.1.1/32 500 range 50
  • D Router2(config)# segment-routingRouter2(config-sr)# ldp mapping-serverRouter2(config-sr-ms)# prefix-sid-mapRouter2(config-sr-ms-map)# address-family ipv4Router2(config-sr-ms-map-af)# 2.2.2.2/32 500 range 40
Explanation

An SR Mapping Server must advertise a Prefix-SID mapping on behalf of LDP-only nodes so SR-capable routers can interwork with them. R1 is the LDP-only node with prefix 10.1.1.1/32; therefore, R2 must configure a mapping-server prefix-sid-map entry for 10.1.1.1/32 under the IPv4 address family. Cisco documents this exact configuration hierarchy and identifies the mapping server as the key component for SR–LDP interworking.

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