Revised LFB input/output text

After the dissemination of the last model draft in February
(draft-ietf-forces-model-02.txt), we got many very useful
comments.  Thanks.  One topic that generated lots of questions
was the concept of LFB inputs and outputs.  It became obvious
to us that in 02 we did not do a good job explaining the proposed
LFB input/output model.

Attached is a fully revised version of the relevant subsections
of 02 (3.2.1 and 3.2.2).  Hopefully this text conveys the design
intent much better.

Comments are welcome!

--
Zsolt Haraszti, Ph.D.                              Tel: +1 919 472 9949
Ericsson IP Infrastructure                         Fax: +1 919 472 9999
Raleigh NC USA                       Email: zsolt.haraszti <at> ericsson.com

3.2.1. LFB Outputs

A LFB output is a conceptual port on a LFB that can  send  information
to  some  other  LFB.  The  information  is  typically  a  packet  and
associated metadata, although in some cases it might consist  of  only
metadata, i.e., with no packet data.

A single LFB output can be connected to only one LFB  input.  This  is
required  to  make  the  packet  flow   through   the   LFB   topology
unambiguous.