In this Hut8 deep dive techtorial we take a detailed look at the BGP Cost Community Extended Community Attribute used in an MPLS L3 VPN when EIGRP is being used as the PE-CE routing protocol! We break down each value of the BGP Cost Community, look at the Point of Insertion (POI), and detail the reason that the BGP Cost Community enables a Provider Edge (PE) router to preempt the regular BGP Best Path Selection Algorithm. Enjoy!