RFC 8231 describes a set of extensions to Path Computation Element
Communication Protocol (PCEP) to enable stateful control of MPLS-TE
and GMPLS Label Switched Paths (LSPs) via PCEP. One of the
extensions is the LSP object which includes a Flag field with a
length of 12 bits. However, all bits of the Flag field have already
been assigned in RFC 8231, RFC 8281, RFC 8623 and I-D.ietf-pce-
This document proposes to define a new LSP-EXTENDED-FLAG TLV for the
LSP object for an extended flag field.
Working Group Summary
Now that all the 12 bits in the flag field of the LSP object [RFC8231] are
already allocated, there is a need to have an extended flag in the form of a
TLV. The response for WGLC was timid mostly because the need for this I-D is
well understood and agreed upon in the WG.
There was a discussion on the use of variable length v/s fixed-length (32-bits)
by one WG participant. The discussion and rationale are captured in the
appendix of the I-D.
There are various proposals in the WG that require new flags and as those get
traction, this extension would potentially be implemented soon.
The usual directorate reviews are enough. No additional reviews are needed.
Document Shepherd: Dhruv Dhody
Responsible Area Director: John Scudder