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Service providers are starting to offer next-generation E-Line (point-to-point) and E-LAN (multipoint-to-multipoint) Ethernet services over their existing SONET/SDH networks. While Ethernet typically is "Best-effort", these emerging services are expected to be "Carrier-class" with strict bandwidth guarantees. Consequently, spanning tree creation, critical to any Ethernet network is fundamentally changed; each tree hop now needs to have sufficient capacity to meet the requisite bandwidth demands. This paper introduces the bandwidth-endowed spanning tree (BEST) problem. Unlike the polynomial complexity of standard spanning tree algorithms, BEST is NP-complete, raising questions about the scalability of these services.

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