This document provides an overview of the role of link indications
within the Internet Architecture. While the judicious use of link
indications can provide performance benefits, experience has also
shown that that inapropriate use can degrade both robustness and
performance. This document summarizes current proposals, describes
the architectural issues and provides examples of appropriate and
inappropriate uses of link layer indications.
http://www.iab.org/documents/drafts/draft-iab-link-indications-01.txt