Intra-chassis redundancy models rely on PXC-based LAG. PXC-based LAG can contain multiple PXCs on the same line card (port redundancy) or PXCs across different line cards (port- and card-level redundancy).
FPE-based PW ports also provide network level-redundancy where MPLS/IP can be rerouted to different I/O ports (because of network failure) without interruption of service.