Extensions to OSPF-TE, ISIS-TE, and RSVP-TE are defined in support of
carrying LSP with strict packet ordering requirements over multipath
and and carrying LSP with strict packet ordering requirements within
LSP without violating requirements to maintain packet ordering. LSP
with strict packet ordering requirements include MPLS-TP LSP.
OSPF-TE and ISIS-TE extensions defined here indicate node and link
capability regarding support for ordered aggregates of traffic,
multipath traffic distribution, and abilities to support multipath
load distribution differently per LSP.
RSVP-TE extensions either identifies an LSP as requiring strict
packet order, or identifies an LSP as carrying one or more LSP that
requires strict packet order further down in the label stack, or
identifies an LSP as having no restrictions on packet ordering except
the restriction to avoid reordering microflows. In addition an
extension indicates whether the first nibble of payload will reliably
indicate whether payload is IPv4, IPv6, or other type of payload,
most notably pseudowire using a pseudowire control word.