Abstract The IETF TRILL (TRansparent Interconnection of Lots of Links) protocol provides optimal pair-wise data forwarding without configuration@ safe forwarding even during periods of temporary loops@ and support for multipathing of both unicast and multicast traffic. TRILL accomplishes this by using IS-IS (Intermediate System to Intermediate System) link state routing and by encapsulating traffic using a header that includes a hop count. Devices that implement TRILL are called Routing Bridges (RBridges). TRILL supports multi-access LAN (Local Area Network) links that can have multiple end stations and RBridges attached. This document describes four aspects of the TRILL LAN Hello protocol used on such links@ particularly adjacency@ designated RBridge selection@ and MTU (Maximum Transmission Unit) and pseudonode procedures@ with state machines. There is no change for IS-IS point-to-point Hellos used on links configured as point-to-point in TRILL.