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Cisco 400-007 Exam - Topic 5 Question 80 Discussion
Topic #: 5
Refer to the exhibit.
An engineer has been asked to redesign the traffic flow toward AS 111 coming from AS 500. Traffic destined to AS 111 network 91.7.0.0/16 should come in via AS 100, while traffic destined to all other networks in AS 111 should continue to use the existing path. Which BGP attributes are best suited to control this inbound traffic coming from BGP AS 500 into the 91.7.0.0/16 network?
Inbound traffic engineering is best controlled by manipulating how external ASes view your routes.
AS path prepending on the 91.7.0.0/16 prefix towards AS 200 makes AS 500 prefer the less-prepended path through AS 100.
This allows granular inbound control for that specific prefix while leaving the rest of the traffic unchanged.
Why other options are incorrect:
B: Extended community is not used for direct inbound path manipulation.
C: Local preference affects outbound traffic, not inbound path selection by remote ASes.
D: MED is only compared between the same AS; it won't affect AS 500's choice.
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