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-
-Network Working Group K. Jiao
-Internet-Draft Huawei
-Intended status: Standards Track G. Zorn
-Expires: April 27, 2011 Network Zen
- October 24, 2010
-
-
- The Diameter Capabilities Update Application
- draft-ietf-dime-capablities-update-07
-
-Abstract
-
- This document defines a new Diameter application and associated
- command codes. The Capabilities Update application is intended to
- allow the dynamic update of certain Diameter peer capabilities while
- the peer-to-peer connection is in the open state.
-
-Status of this Memo
-
- This Internet-Draft is submitted in full conformance with the
- provisions of BCP 78 and BCP 79.
-
- Internet-Drafts are working documents of the Internet Engineering
- Task Force (IETF). Note that other groups may also distribute
- working documents as Internet-Drafts. The list of current Internet-
- Drafts is at http://datatracker.ietf.org/drafts/current/.
-
- Internet-Drafts are draft documents valid for a maximum of six months
- and may be updated, replaced, or obsoleted by other documents at any
- time. It is inappropriate to use Internet-Drafts as reference
- material or to cite them other than as "work in progress."
-
- This Internet-Draft will expire on April 27, 2011.
-
-Copyright Notice
-
- Copyright (c) 2010 IETF Trust and the persons identified as the
- document authors. All rights reserved.
-
- This document is subject to BCP 78 and the IETF Trust's Legal
- Provisions Relating to IETF Documents
- (http://trustee.ietf.org/license-info) in effect on the date of
- publication of this document. Please review these documents
- carefully, as they describe your rights and restrictions with respect
- to this document. Code Components extracted from this document must
- include Simplified BSD License text as described in Section 4.e of
- the Trust Legal Provisions and are provided without warranty as
- described in the Simplified BSD License.
-
-
-
-Jiao & Zorn Expires April 27, 2011 [Page 1]
-
-Internet-Draft Diameter Capabilities Update October 2010
-
-
-Table of Contents
-
- 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
- 2. Specification of Requirements . . . . . . . . . . . . . . . . . 3
- 3. Diameter Protocol Considerations . . . . . . . . . . . . . . . 3
- 4. Capabilities Update . . . . . . . . . . . . . . . . . . . . . . 3
- 4.1. Command-Code Values . . . . . . . . . . . . . . . . . . . . 4
- 4.1.1. Capabilities-Update-Request . . . . . . . . . . . . . . 5
- 4.1.2. Capabilities-Update-Answer . . . . . . . . . . . . . . 5
- 5. Security Considerations . . . . . . . . . . . . . . . . . . . . 6
- 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
- 6.1. Application Identifier . . . . . . . . . . . . . . . . . . 6
- 6.2. Command Codes . . . . . . . . . . . . . . . . . . . . . . . 6
- 7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 6
- 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 6
- 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
- 9.1. Normative References . . . . . . . . . . . . . . . . . . . 6
- 9.2. Informative References . . . . . . . . . . . . . . . . . . 7
- Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 7
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-
-
-1. Introduction
-
- Capabilities exchange is an important component of the Diameter Base
- Protocol [I-D.ietf-dime-rfc3588bis], allowing peers to exchange
- identities and Diameter capabilities (protocol version number,
- supported Diameter applications, security mechanisms, etc.). As
- defined in RFC 3588, however, the capabilities exchange process takes
- place only once, at the inception of a transport connection between a
- given pair of peers. Therefore, if a peer's capabilities change (due
- to software update, for example), the existing connection(s) must be
- torn down (along with all of the associated user sessions) and
- restarted before the modified capabilities can be advertised.
-
- This document defines a new Diameter application intended to allow
- the dynamic update of a subset of Diameter peer capabilities over an
- existing connection. Because the Capabilities Update application
- specified herein operates over an existing transport connection,
- modification of certain capabilities is prohibited. Specifically,
- modifying the security mechanism in use is not allowed; if the
- security method used between a pair of peers is changed the affected
- connection MUST be restarted.
-
-
-2. Specification of Requirements
-
- The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
- "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
- document are to be interpreted as described in RFC 2119 [RFC2119].
-
-
-3. Diameter Protocol Considerations
-
- This section details the relationship of the Diameter Capabilities
- Update application to the Diameter Base Protocol.
-
- This document specifies Diameter Application-ID <TBD1>. Diameter
- nodes conforming to this specification MUST advertise support by
- including the value <TBD1> in the Auth-Application-Id of the
- Capabilities-Exchange-Request (CER) and Capabilities-Exchange-Answer
- (CEA) commands [I-D.ietf-dime-rfc3588bis].
-
-
-4. Capabilities Update
-
- When the capabilities of a Diameter node conforming to this
- specification change, it MUST notify all of the nodes with which it
- has an open transport connection and which have also advertised
- support for the Capabilities Update application using the
-
-
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-
-
- Capabilities-Update-Request (CUR) message (Section 4.1.1). This
- message allows the update of a peer's capabilities (supported
- Diameter applications, etc.).
-
- A Diameter node only issues a given command to those peers that have
- advertised support for the Diameter application that defines the
- command; a Diameter node must cache the supported applications in
- order to ensure that unrecognized commands and/or Attribute-Value
- Pairs (AVPs) are not unnecessarily sent to a peer.
-
- The receiver of the CUR MUST determine common applications by
- computing the intersection of its own set of supported Application Id
- against all of the application identifier AVPs (Auth-Application-Id,
- Acct-Application-Id and Vendor-Specific- Application-Id) present in
- the CUR. The value of the Vendor-Id AVP in the Vendor-Specific-
- Application-Id MUST NOT be used during computation.
-
- If the receiver of a CUR does not have any applications in common
- with the sender then it MUST return a Capabilities-Update-Answer
- (CUA) (Section 4.1.2) with the Result-Code AVP set to
- DIAMETER_NO_COMMON_APPLICATION [I-D.ietf-dime-rfc3588bis], and SHOULD
- disconnect the transport layer connection; however, if active
- sessions are using the connection, peers MAY delay disconnection
- until the sessions can be redirected or gracefully terminated. Note
- that receiving a CUA from a peer advertising itself as a Relay (see
- [I-D.ietf-dime-rfc3588bis], Section 2.4) MUST be interpreted as
- having common applications with the peer.
-
- As for CER/CEA messages, the CUR and CUA messages MUST NOT be
- proxied, redirected or relayed.
-
- Even though the CUR/CUA messages cannot be proxied, it is still
- possible for an upstream agent to receive a message for which there
- are no peers available to handle the application that corresponds to
- the Command-Code. This could happen if, for example, the peers are
- too busy or down. In such instances, the 'E' bit MUST be set in the
- answer message with the Result-Code AVP set to
- DIAMETER_UNABLE_TO_DELIVER to inform the downstream peer to take
- action (e.g., re-routing requests to an alternate peer).
-
-4.1. Command-Code Values
-
- This section defines Command-Code [I-D.ietf-dime-rfc3588bis] values
- that MUST be supported by all Diameter implementations conforming to
- this specification. The following Command Codes are defined (using
- modified ABNF [I-D.ietf-dime-rfc3588bis]) in this document:
- Capabilities-Update-Request (CUR, Section 4.1.1) and Capabilities-
- Update-Answer (CUA, Section 4.1.2).
-
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-4.1.1. Capabilities-Update-Request
-
- The Capabilities-Update-Request (CUR), indicated by the Command-Code
- set to <CUCC> and the Command Flags' 'R' bit set, is sent to update
- local capabilities. Upon detection of a transport failure, this
- message MUST NOT be sent to an alternate peer.
-
- When Diameter is run over the Stream Control Transmission Protocol
- [RFC4960], which allows connections to span multiple interfaces and
- multiple IP addresses, the Capabilities-Update-Request message MUST
- contain one Host-IP-Address AVP for each potential IP address that
- may be locally used when transmitting Diameter messages.
-
- Message Format
-
- <CUR> ::= < Diameter Header: <CUCC>, REQ >
- { Origin-Host }
- { Origin-Realm }
- 1* { Host-IP-Address }
- { Vendor-Id }
- { Product-Name }
- [ Origin-State-Id ]
- * [ Supported-Vendor-Id ]
- * [ Auth-Application-Id ]
- * [ Acct-Application-Id ]
- * [ Vendor-Specific-Application-Id ]
- [ Firmware-Revision ]
- * [ AVP ]
-
-4.1.2. Capabilities-Update-Answer
-
- The Capabilities-Update-Answer, indicated by the Command-Code set to
- <CUCC> and the Command Flags' 'R' bit cleared, is sent in response to
- a CUR message.
-
- Message Format
-
- <CUA> ::= < Diameter Header: <CUCC> >
- { Origin-Host }
- { Origin-Realm }
- { Result-Code }
- [ Error-Message ]
- * [ AVP ]
-
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-
-5. Security Considerations
-
- The security considerations applicable to the Diameter Base Protocol
- [I-D.ietf-dime-rfc3588bis] are also applicable to this document.
-
-
-6. IANA Considerations
-
- This section explains the criteria to be used by the IANA for
- assignment of numbers within namespaces used within this document.
-
-6.1. Application Identifier
-
- This specification assigns the value <TBD1> from the Application
- Identifiers namespace [I-D.ietf-dime-rfc3588bis]. See Section 3 for
- the assignment of the namespace in this specification.
-
-6.2. Command Codes
-
- This specification assigns the value <CUCC> from the Command Codes
- namespace [I-D.ietf-dime-rfc3588bis]. See Section 4.1 for the
- assignment of the namespace in this specification.
-
-
-7. Contributors
-
- This document is based upon work done by Tina Tsou.
-
-
-8. Acknowledgements
-
- Thanks to Sebastien Decugis, Niklas Neumann, Subash Comerica, Lionel
- Morand, Dan Romascanu, Dan Harkins and Ravi for helpful review and
- discussion.
-
-
-9. References
-
-9.1. Normative References
-
- [I-D.ietf-dime-rfc3588bis]
- Fajardo, V., Arkko, J., Loughney, J., and G. Zorn,
- "Diameter Base Protocol", draft-ietf-dime-rfc3588bis-25
- (work in progress), September 2010.
-
- [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
- Requirement Levels", BCP 14, RFC 2119, March 1997.
-
-
-
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-9.2. Informative References
-
- [RFC4960] Stewart, R., "Stream Control Transmission Protocol",
- RFC 4960, September 2007.
-
-
-Authors' Addresses
-
- Jiao Kang
- Huawei Technologies
- Section B1, Huawei Industrial Base
- Bantian, Longgang District
- Shenzhen 518129
- P.R. China
-
- Phone: +86 755 2878-6690
- Email: [email protected]
-
-
- Glen Zorn
- Network Zen
- 227/358 Thanon Sanphawut
- Bang Na, Bangkok 10260
- Thailand
-
- Phone: +66 (0) 87-040-4617
- Email: [email protected]
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