GMPLS provides control for multiple switching technologies, and
hierarchical switching within a technology. GMPLS routing and
signaling use common values to indicate switching technology type.
These values are carried in routing in the Switching Capability
field, and in signaling in the Switching Type field. While the
values using in these fields are the primary indicators of the
technology and hierarchy level being controlled, the values are
not consistently defined and used across the different
technologies supported by GMPLS. This document is intended to
resolve the inconsistent definition and use of the Switching
Capability and Type fields by narrowly scoping the meaning and use
of the fields. This document updates any document that uses the
GMPLS Switching Capability and Types fields, in particular RFC
3471, RFC 4202, RFC 4203, and RFC 5307.