http://www.rfc-editor.org/rfc/rfc7781.txt
RFC 7781: Transparent Interconnection of Lots of Links (TRILL): Pseudo-Nickname for Active-Active Access, H. Zhai, T. Senevirathne, R. Perlman, M. Zhang, Y. Li2016-02-01T23:00:00-00:00The IETF TRILL (Transparent Interconnection of Lots of Links) protocol provides support for flow-level multipathing for both unicast and multi-destination traffic in networks with arbitrary topology. Active-active access at the TRILL edge is the extension of these characteristics to end stations that are multiply connected to a TRILL campus as discussed in RFC 7379. In this document, the edge RBridge (Routing Bridge, or TRILL switch) group providing active-active access to such an end station is represented as a virtual RBridge. Based on the concept of the virtual RBridge, along with its pseudo-nickname, this document specifies a method for TRILL active-active access by such end stations.