[RFC4447]describes a set of procedures for Pseudowire set-up and
maintenance using LDP as signaling protocol.
[I-D.ietf-pwe3-dynamic-ms-pw] extends the mechanisms described in
[RFC4447] for dynamic placement of multi- segment pseudowires.
This document describes an extension to [RFC4447]procedures which may
be used to pass additional information to S-PE/T-PEs when SS-PWs or
MS-PWs are set-up.
The intention of the proposed technique is to aid in policy
administration, specifically during MS-PW set-up across various
S-PEs. The proposed method is very generic so that it can support
the management of various parameters or rules while setting up
pseudowires with minimal overhead.