This document describes a framework comprised of a number of
scenarios and associated requirements for pseudowire (PW) redundancy.
A set of redundant PWs is configured between provider edge (PE) nodes
in single-segment PW applications or between terminating PE (T-PE)
nodes in multi-segment PW applications. In order for the PE/T-PE
nodes to indicate the preferred PW to use for forwarding PW packets
to one another, a new PW status is required to indicate the
preferential forwarding status of active or standby for each PW in
the redundant set. This document is not an Internet Standards Track
specification; it is published for informational purposes.