Technical Summary
Some MPLS labels have been allocated for specific purposes. A block
of labels (0-15) has been set aside to this end, and are commonly
called "reserved labels". As there are only 16 of these special purpose
labels, caution is needed in the allocation of new special purpose labels,
yet at the same time allow forward progress when one is called for.
This document defines new procedures to follow in the allocation and
retirement of special purpose labels, as well as a method to extend
the special purpose label space. Finally, this memo renames the IANA
registry for these labels to "Special Purpose MPLS Label Values", and
creates a new one called the "Extended Special Purpose MPLS Label
Values" registry.
Working Group Summary
no controversy. Some contructive discussion of the details.
Document Quality
The document has been well reviewed, and has been updated to reflect
comments received in WG last call. Due to the nature of this document it
needs to be published in final form (as an RFC) prior to implementation
but authors and reviewers include multiple vendors who would need to
implement the extension to the special purpose label space.
Personnel
Ross Callon is the document shepherd. The AD for MPLS (Adrian
Farrel) is co-author, and so the other routing AD (Alia Atlas) will
act as responsible AD.
RFC Editor Note
Please update the Abstract as follows:
OLD
This memo defines new procedures to follow in the allocation and
retirement of special purpose labels, as well as a method to extend
the special purpose label space.
NEW
This memo defines new procedures to follow in the allocation and
retirement of special purpose labels, as well as a method to extend
the special purpose label space and a decription of how to handle
extended special purpose labels in the data plane.