The IETF TRILL (Transparent Interconnection of Lots of Links) protocol includes an optional mechanism (specified in RFC 7178), called RBridge Channel, for the transmission of typed messages between TRILL switches in the same campus and the transmission of such messages between TRILL switches and end stations on the same link. This document specifies two optional extensions to the RBridge Channel protocol: (1) a standard method to tunnel a variety of payload types by encapsulating them in an RBridge Channel message; and (2) a method to support security facilities for RBridge Channel messages. This document updates RFC 7178.