JNCIE-SP Practice Questions - Juniper Networks Certified Expert, Service Provider Routing And Switching Exam

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A network engineer is configuring IS-IS ABR summarization between Level 1 and Level 2. After adding a summary prefix under the Level 2 IS-IS export policy, the summary is not advertised into Level 2. What is the most likely cause?

IS-IS does not support prefix summarization at the ABR The policy is applied as import instead of export on the Level 2 instance The contributing Level 1 prefixes are not installed in the routing table yet Summarization requires a dedicated loopback interface at the ABR

Correct Answer:

The contributing Level 1 prefixes are not installed in the routing table yet

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