本日発表されたPS段階のRFC3201なんですが関係ありそうでしょうか？
メーリングリストの案内文をのっけます。
This memo defines an extension of the Management Information Base
(MIB) for use with network management protocols in TCP/IP-based
internets. In particular, it defines objects for managing the
insertion of interesting Circuit Interfaces into the ifTable. This is
important for circuits that must be used within other MIB modules
which require an ifEntry. It allows for integrated monitoring of
circuits as well as routing to circuits using unaltered, pre-existing
MIB modules.

This document is a product of the Frame Relay Service MIB Working
Group of the IETF.

This is now a Proposed Standard Protocol.

This document specifies an Internet standards track protocol for
the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the
"Internet Official Protocol Standards" (STD 1) for the
standardization state and status of this protocol. Distribution
of this memo is unlimited.