This document specifies extensions to the Inter-Chassis Communication
Protocol (ICCP) to support inter-chassis linear multiplex section
protection (MSP) as described in G.841 and automatic protection
switching as defined in ANSI T1.105.01. This document considers an
application where a CE device or access network is attached to two
PEs through Synchronous Digital Hierarchy (SDH) circuits, and MSP or
APS is used to protect the attachment circuits. ICCP is used to
support configuration and state synchronization between two chassis.
CE device or access network attached to more than two PEs is out of
the scope of this document.