The IETF TRILL (Transparent Interconnection of Lots of Links) protocol includes an optional mechanism, called RBridge Channel, that is specified in RFC 7178, for the transmission of typed messages between TRILL switches in the same campus and 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.