< draft-ietf-dime-group-signaling-09.txt		draft-ietf-dime-group-signaling-10.txt >
	Diameter Maintenance and Extensions (DIME) M. Jones		Diameter Maintenance and Extensions (DIME) M. Jones
	Internet-Draft		Internet-Draft
	Intended status: Standards Track M. Liebsch		Intended status: Standards Track M. Liebsch
	Expires: March 19, 2018		Expires: July 12, 2018
	L. Morand		L. Morand
	September 15, 2017		January 8, 2018
	Diameter Group Signaling		Diameter Group Signaling
	draft-ietf-dime-group-signaling-09.txt		draft-ietf-dime-group-signaling-10.txt
	Abstract		Abstract
	In large network deployments, a single Diameter node can support over		In large network deployments, a single Diameter node can support over
	a million concurrent Diameter sessions. Recent use cases have		a million concurrent Diameter sessions. Recent use cases have
	revealed the need for Diameter nodes to apply the same operation to a		revealed the need for Diameter nodes to apply the same operation to a
	large group of Diameter sessions concurrently. The Diameter base		large group of Diameter sessions concurrently. The Diameter base
	protocol commands operate on a single session so these use cases		protocol commands operate on a single session so these use cases
	could result in many thousands of command exchanges to enforce the		could result in many thousands of command exchanges to enforce the
	same operation on each session in the group. In order to reduce		same operation on each session in the group. In order to reduce
	skipping to change at page 1, line 42 ¶		skipping to change at page 1, line 42 ¶
	Internet-Drafts are working documents of the Internet Engineering		Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF). Note that other groups may also distribute		Task Force (IETF). Note that other groups may also distribute
	working documents as Internet-Drafts. The list of current Internet-		working documents as Internet-Drafts. The list of current Internet-
	Drafts is at https://datatracker.ietf.org/drafts/current/.		Drafts is at https://datatracker.ietf.org/drafts/current/.
	Internet-Drafts are draft documents valid for a maximum of six months		Internet-Drafts are draft documents valid for a maximum of six months
	and may be updated, replaced, or obsoleted by other documents at any		and may be updated, replaced, or obsoleted by other documents at any
	time. It is inappropriate to use Internet-Drafts as reference		time. It is inappropriate to use Internet-Drafts as reference
	material or to cite them other than as "work in progress."		material or to cite them other than as "work in progress."
	This Internet-Draft will expire on March 19, 2018.		This Internet-Draft will expire on July 12, 2018.
	Copyright Notice		Copyright Notice
	Copyright (c) 2017 IETF Trust and the persons identified as the		Copyright (c) 2018 IETF Trust and the persons identified as the
	document authors. All rights reserved.		document authors. All rights reserved.
	This document is subject to BCP 78 and the IETF Trust's Legal		This document is subject to BCP 78 and the IETF Trust's Legal
	Provisions Relating to IETF Documents		Provisions Relating to IETF Documents
	(https://trustee.ietf.org/license-info) in effect on the date of		(https://trustee.ietf.org/license-info) in effect on the date of
	publication of this document. Please review these documents		publication of this document. Please review these documents
	carefully, as they describe your rights and restrictions with respect		carefully, as they describe your rights and restrictions with respect
	to this document. Code Components extracted from this document must		to this document. Code Components extracted from this document must
	include Simplified BSD License text as described in Section 4.e of		include Simplified BSD License text as described in Section 4.e of
	the Trust Legal Provisions and are provided without warranty as		the Trust Legal Provisions and are provided without warranty as
	skipping to change at page 8, line 26 ¶		skipping to change at page 8, line 26 ¶
	entry about the group assignment together with a session's state. A		entry about the group assignment together with a session's state. A
	list of all known session groups should be locally maintained on each		list of all known session groups should be locally maintained on each
	node, each group pointing to individual sessions being assigned to		node, each group pointing to individual sessions being assigned to
	the group. A Diameter node MUST also keep a record about sessions,		the group. A Diameter node MUST also keep a record about sessions,
	which have been assigned to a session group by itself.		which have been assigned to a session group by itself.
	4.2.1. Group assignment at session initiation		4.2.1. Group assignment at session initiation
	To assign a session to a group at session initiation, a Diameter		To assign a session to a group at session initiation, a Diameter
	client sends a service specific request, e.g. NASREQ AA-Request		client sends a service specific request, e.g. NASREQ AA-Request
	[RFC4005], containing one or more session group identifiers. Each of		[RFC7155], containing one or more session group identifiers. Each of
	these groups MUST be identified by a unique Session-Group-Id		these groups MUST be identified by a unique Session-Group-Id
	contained in a separate Session-Group-Info AVP as specified in		contained in a separate Session-Group-Info AVP as specified in
	Section 7.		Section 7.
	The client may choose one or multiple session groups from a list of		The client may choose one or multiple session groups from a list of
	existing session groups. Alternatively, the client may decide to		existing session groups. Alternatively, the client may decide to
	create a new group to which the session is assigned and identify		create a new group to which the session is assigned and identify
	itself in the <DiameterIdentity> portion of the Session-Group-Id AVP		itself in the <DiameterIdentity> portion of the Session-Group-Id AVP
	as per Section 7.3		as per Section 7.3
	skipping to change at page 9, line 15 ¶		skipping to change at page 9, line 15 ¶
	resources for managing additional groups. When rejected, the session		resources for managing additional groups. When rejected, the session
	MUST NOT be assigned to any session group.		MUST NOT be assigned to any session group.
	If the Diameter server accepts the client's request for a group		If the Diameter server accepts the client's request for a group
	assignment, the server MUST assign the new session to each of the one		assignment, the server MUST assign the new session to each of the one
	or multiple identified session groups when present in the Session-		or multiple identified session groups when present in the Session-
	Group-Info AVP. In case one or multiple identified session groups		Group-Info AVP. In case one or multiple identified session groups
	are not already stored by the server, the server MUST store the new		are not already stored by the server, the server MUST store the new
	identified group(s) to its local list of known session groups. When		identified group(s) to its local list of known session groups. When
	sending the response to the client, e.g. a service-specific auth		sending the response to the client, e.g. a service-specific auth
	response as per NASREQ AA-Answer [RFC4005], the server MUST include		response as per NASREQ AA-Answer [RFC7155], the server MUST include
	all Session-Group-Info AVPs as received in the client's request.		all Session-Group-Info AVPs as received in the client's request.
	In addition to the one or multiple session groups identified in the		In addition to the one or multiple session groups identified in the
	client's request, the server may decide to assign the new session to		client's request, the server may decide to assign the new session to
	one or multiple additional groups. In such a case, the server MUST		one or multiple additional groups. In such a case, the server MUST
	add to the response the additional Session-Group-Info AVPs, each		add to the response the additional Session-Group-Info AVPs, each
	identifying a session group to which the new session is assigned by		identifying a session group to which the new session is assigned by
	the server. Each of the Session-Group-Info AVP added by the server		the server. Each of the Session-Group-Info AVP added by the server
	MUST have the SESSION_GROUP_ALLOCATION_ACTION flag set in the		MUST have the SESSION_GROUP_ALLOCATION_ACTION flag set in the
	Session-Group-Control-Vector AVP set.		Session-Group-Control-Vector AVP set.
	If the Diameter server rejects the client's request for a group		If the Diameter server rejects the client's request for a group
	assignment, the server sends the response to the client, e.g. a		assignment, the server sends the response to the client, e.g. a
	service-specific auth response as per NASREQ AA-Answer [RFC4005], and		service-specific auth response as per NASREQ AA-Answer [RFC7155], and
	MUST include all Session-Group-Info AVPs as received in the client's		MUST include all Session-Group-Info AVPs as received in the client's
	request (if any) while clearing the SESSION_GROUP_ALLOCATION_ACTION		request (if any) while clearing the SESSION_GROUP_ALLOCATION_ACTION
	flag of the Session-Group-Control-Vector AVP. The server MAY accept		flag of the Session-Group-Control-Vector AVP. The server MAY accept
	the client's request for the identified session but refuse the		the client's request for the identified session but refuse the
	session's assignment to any session group. The server sends the		session's assignment to any session group. The server sends the
	response to the client indicating success in the result code. In		response to the client indicating success in the result code. In
	such case the session is treated as single session without assignment		such case the session is treated as single session without assignment
	to any session group by the Diameter nodes.		to any session group by the Diameter nodes.
	If the Diameter server accepts the client's request for a group		If the Diameter server accepts the client's request for a group
	skipping to change at page 21, line 30 ¶		skipping to change at page 21, line 30 ¶
	thorough review and comments on advanced versions of the WG document,		thorough review and comments on advanced versions of the WG document,
	which helped a lot to improve this specification.		which helped a lot to improve this specification.
	12. Normative References		12. Normative References
	[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate		[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
	Requirement Levels", BCP 14, RFC 2119,		Requirement Levels", BCP 14, RFC 2119,
	DOI 10.17487/RFC2119, March 1997,		DOI 10.17487/RFC2119, March 1997,
	<https://www.rfc-editor.org/info/rfc2119>.		<https://www.rfc-editor.org/info/rfc2119>.
	[RFC4005] Calhoun, P., Zorn, G., Spence, D., and D. Mitton,
	"Diameter Network Access Server Application", RFC 4005,
	DOI 10.17487/RFC4005, August 2005,
	<https://www.rfc-editor.org/info/rfc4005>.
	[RFC6733] Fajardo, V., Ed., Arkko, J., Loughney, J., and G. Zorn,		[RFC6733] Fajardo, V., Ed., Arkko, J., Loughney, J., and G. Zorn,
	Ed., "Diameter Base Protocol", RFC 6733,		Ed., "Diameter Base Protocol", RFC 6733,
	DOI 10.17487/RFC6733, October 2012,		DOI 10.17487/RFC6733, October 2012,
	<https://www.rfc-editor.org/info/rfc6733>.		<https://www.rfc-editor.org/info/rfc6733>.
			[RFC7155] Zorn, G., Ed., "Diameter Network Access Server
			Application", RFC 7155, DOI 10.17487/RFC7155, April 2014,
			<https://www.rfc-editor.org/info/rfc7155>.
	Appendix A. Session Management -- Exemplary Session State Machine		Appendix A. Session Management -- Exemplary Session State Machine
	A.1. Use of groups for the Authorization Session State Machine		A.1. Use of groups for the Authorization Session State Machine
	Section 8.1 in [RFC6733] defines a set of finite state machines,		Section 8.1 in [RFC6733] defines a set of finite state machines,
	representing the life cycle of Diameter sessions, and which MUST be		representing the life cycle of Diameter sessions, and which MUST be
	observed by all Diameter implementations that make use of the		observed by all Diameter implementations that make use of the
	authentication and/or authorization portion of a Diameter		authentication and/or authorization portion of a Diameter
	application. This section defines, as example, additional state		application. This section defines, as example, additional state
	transitions related to the processing of the group commands which may		transitions related to the processing of the group commands which may
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