Shepherd writeup

=== 1. Summary ===

The document shepherd is Lionel Morand.
The responsible Area Director is Kathleen Moriarty.

This document defines optional Explicit Congestion Notification (ECN) and filter related attributes that can be used for improved traffic identification, support of ECN and minimized filter administration within Diameter.  

RFC 5777 (Traffic Classification and QoS Attributes for Diameter) defines a Filter-Rule AVP that accommodates extensions for classification, conditions and actions. 

In this draft, the Classifier Grouped AVP contained in the Filter-Rule AVP is extended with the new ECN-IP-Codepoint AVP which gives the Explicit Congestion Notification (ECN) codepoint values (defined in RFC3168) to match in the IP header. Moreover, the Filter-Rule Grouped AVP itself is extended with a new Congestion-Treatment AVP that indicates how congested traffic should be treated.
The Flow-Count and Packet-Count AVPs are also defined in this document to be sent to report in application specific command information of the group of flows described by the Filter-Rule, IPFilterRule or other Diameter traffic filters. This information can be used by the application for improved decision making, Charging and rudimentary traffic profiling.

=== 2. Review and Consensus ===

The proposed extensions for RFC5777 are simple (definition of new AVPs in extendable Grouped AVPs), and there was no difficulty in coming to consensus on all points.
As it is only about defining new optional AVPs, there were no real discussion in the WG, considering that the proposed AVP definitions were OK.
Comments received in the meeting or on the mailing list have been taken into account and the document is seen as ready for publication. No concern/comment was received during the WGLC.

=== 3. Intellectual Property ===

Each author has confirmed conformance with BCP 78/79.  There are no IPR disclosures on the document.

=== 4. Other Points ===

The extensions to the RFC5777 regarding the use of the Filter-Rule and the Classifier Grouped AVPs proposed in this document are optional  and compatible with the existing RFC5777. No update of the RFC577 is required.