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

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A service provider needs to redistribute OSPF external routes into IS-IS with a specific tag to prevent re-redistribution back into OSPF on a downstream router. Which Junos configuration element correctly implements this?

Apply a community to the OSPF routes before redistribution; IS-IS reads BGP communities Set a tag value in the IS-IS export policy and match that tag in the OSPF import policy on the downstream router Use a route-filter to tag routes at the OSPF-to-IS-IS boundary using 'then tag' Configure an IS-IS route-target extended community on the redistributed prefixes

Correct Answer:

Use a route-filter to tag routes at the OSPF-to-IS-IS boundary using 'then tag'

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