5.4

The task says, "...AS 400 will not provide transit for traffic coming from AS 54...destined for AS 254."

The solution says, "...the simplest way to accomplish this task is to stop advertising prefixes from AS 254 to AS 54." The

 

Looking at the output for the traffic....

   Network          Next Hop            Metric LocPrf Weight Path
*> 205.90.31.0      132.1.17.1                             0 300 200 254 ?
*> 220.20.3.0       132.1.17.1                             0 300 200 254 ?
*> 222.22.2.0       132.1.17.1                             0 300 200 254 ?

The solution is to block _254$ -- Why is traffic that originated in AS 254 assumed to be headed back to AS 254?

Clearly I'm missing something. Can someone set me straight?

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