By default so far following all the add/remove configs in the BGP SG, R6's bestpath for 112.0.0.0/8 isn't via R1/R4, it's via it's external peer to BB1. Therefore the no-export community doesn't affect it and it advertises it's bestpath to SW1 (and eventually AS 200 recieves it as well). I used a quick route-map on R6 to weight 112.0.0.0/8 learnt via R1 to 1. No biggie as the whole point of the task was to learn how to use attribute-maps, but I figured I'd post in case somebody else was stuck.
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