Question:
Which class of BGP path attributes is not recognized by all BGP implementations but must be passed on to the next AS?
- optional transitive
- optional nontransitive
- well-known discretionary
- well-known mandatory
Explanation: The BGP prefix path attributes are classified as follows:
- Well-known mandatory – supported by all BGP implementations and advertised between autonomous systems
- Well-known discretionary – supported by all BGP implementations and not advertised between autonomous systems
- Optional transitive – not supported by all BGP implementations and advertised between autonomous systems
- Optional nontransitive – not supported by all BGP implementations and not advertised between autonomous systems
Exam with this question: CCNP Enterprise: Advanced Routing (Version 8.0) – BGP Exam
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