Technical Summary
The TRILL base protocol facilitates loop free connectivity to
non-TRILL networks via choice of an Appointed Forwarder for a set of
VLANs. Appointed Forwarders provides load sharing based on VLAN with
an active-standby model. High performance operations require an
active-active load sharing model with rapid fail over and load
spreading on a per flow basis. Active-Active load sharing can be
accomplished by representing any given non-TRILL network with a single
virtual RBridge. Virtual representation of the non-TRILL network with
a single RBridge poses serious challenges in multi-destination RPF
(Reverse Path Forwarding) check calculations. This document specifies
required enhancements to build Coordinated Multicast Trees (CMT)
within the TRILL campus to solve RPF related issues.
Working Group Summary
This draft was developed by the WG over a two year period. There has
been relatively little controversy over the technical content of the
draft. It has good WG support.
Document Quality
This document is of good quality. CMT is implemented in the Cisco
Nexus product line.
Personnel
Document Shepherd: Donald Eastlake, 3rd
Responsible Area Director: Alia Atlas