After some changes in the routing policy, it is noticed that the router in AS 45123 is being used as a transit AS router for several service provides.
Which configuration ensures that the branch router in AS 45123 advertises only the local networks to all SP neighbors?
A)
B)
C)
D)
A . Option A
B . Option B
C . Option C
D . Option D
Answer: D
Explanation:
By default BGP advertises all prefixes to external BGP neighbors. This means that if you are
multi-homed (connected to two or more ISPs) then you might become a transit AS. For example,
ISP 2 in AS 200 can send traffic to your router in AS 100 to reach ISP 3 in AS 300 because you
advertised prefixes in ISP 3 to ISP 2.
This is what will be seen in the BGP routing table of ISP1:
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