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rfc:rfc3475

Network Working Group O. Aboul-Magd Request for Comments: 3475 Nortel Networks Category: Informational March 2003

               Documentation of IANA assignments for
      Constraint-Based LSP setup using LDP (CR-LDP) Extensions
           for Automatic Switched Optical Network (ASON)

Status of this Memo

 This memo provides information for the Internet community.  It does
 not specify an Internet standard of any kind.  Distribution of this
 memo is unlimited.

Copyright Notice

 Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

 Automatic Switched Optical Network (ASON) is an architecture,
 specified by ITU-T Study Group 15, for the introduction of a control
 plane for optical networks.  The ASON architecture specifies a set of
 reference points that defines the relationship between the ASON
 architectural entities.  Signaling over interfaces defined in those
 reference points can make use of protocols that are defined by the
 IETF in the context of Generalized Multi-Protocol Label Switching
 (GMPLS) work.  This document describes Constraint-Based LSP setup
 using LDP (CR-LDP) extensions for signaling over the interfaces
 defined in the ASON reference points.  The purpose of the document is
 to request that the IANA assigns code points necessary for the CR-LDP
 extensions.  The protocol specifications for the use of the CR-LDP
 extensions are found in ITU-T documents.

Table of Contents

 1.  Introduction .................................................  2
 2.  Overview of CR-LDP Extensions for ASON .......................  2
 3.  CR-LDP Messages for ASON .....................................  3
    3.1 Call Setup Message ........................................  4
       3.1.2 Call Setup Procedure .................................  5
    3.2 The Call Release Message ..................................  5
       3.2.1 Call Release Procedure ...............................  6
 4.  CR-LDP TLV for ASON ..........................................  6
    4.1 Call ID TLV ...............................................  6
       4.1.1 Call ID Procedure ....................................  8
    4.2 Call Capability TLV .......................................  9

Aboul-Magd Informational [Page 1] RFC 3475 CR-LDP Extensions for ASON March 2003

    4.3 Crankback TLV .............................................  9
 5.  Additional Error Codes ....................................... 10
 6.  IANA Consideration ........................................... 11
 9.  Security Considerations ...................................... 11
 10. Normative References ......................................... 11
 11. Intellectual Property ........................................ 12
 12. Author's Address ............................................. 12
 13. Full Copyright Statement ..................................... 13

1. Introduction

 Automatic Switched Optical Network (ASON) is an architecture,
 specified by ITU-T Study Group 15 (SG15), for the introduction of a
 control plane for optical networks.  The development and the
 standardization of ASON has been done by ITU-T SG15 and is documented
 in recommendation G.8080 [1].  The architecture includes a control
 plane with a set of reference points between the architectural
 components.  The ASON signaling that runs over interfaces defined in
 those reference points are described in ITU-T recommendation G.7713
 [2].
 Constraint-Based LSP Setup using LDP (CR-LDP) [3] is one of the
 protocols selected by the ITU for the realization of G.7713 and its
 dynamic connection management. The work specific to CR-LDP extensions
 for ASON is documented in ITU-T recommendation G.7713.3 [8].
 This document introduces those CR-LDP extensions that are specific to
 ASON and requests IANA allocation of code points for these
 extensions.  The document does not specify how these extensions are
 used; that is the subject of the above mentioned ITU-T documents.
 This document should be considered in conjunction with RFC 3036 [4],
 RFC 3212 [3], and CR-LDP extensions for GMPLS [5].

2. Overview of CR-LDP Extensions for ASON

 This document describes ASON specific CR-LDP extensions covering the
 following ASON signaling requirements:
  1. Call and connection control separation
  2. Support of Soft Permanent Connections (SPC)
  3. Crankback
  4. Additional error codes
 An important ASON architectural principle is the separation between
 the call and the connection controllers as described in G.8080.  Call
 and connection control separation allows for a call with multiple
 connections associated with it.  It also allows for a call with no

Aboul-Magd Informational [Page 2] RFC 3475 CR-LDP Extensions for ASON March 2003

 connections (a temporary situation that might be useful during
 recovery).
 The separation of the call and the connection controllers could be
 achieved using one of two models.  The first model is one where the
 call set up request is always accompanied by a connection request.
 The second model is one in which call set up is done independently
 from connection set up.  The first model is usually referred to as
 logical separation, while the second model is usually referred to as
 complete separation.  CR-LDP extensions for ASON support the two
 separation models.
 Two new messages are introduced for call operations (set up and
 release).  The Call Setup message is used for those cases where
 complete separation is required.  Otherwise the LDP Label Request
 message is used for logical separation.
 A connection set up request must indicate the call to which the
 connection needs to be associated.  A Call ID TLV is introduced to
 achieve this goal.  The structure of the Call ID allows it to have a
 global or an operator scope.
 Call release is always achieved using the Call Release message.  The
 reception of the call Release messages signifies the intention to
 remove all connections that are associated to the call.  Connection
 release is achieved using the CR-LDP label release procedure (using
 LDP Label Release and Label Withdraw messages) as defined in [4].
 A Call Capability TLV is also introduced to explicitly indicate the
 capability of the requested call.
 An Soft Permanent Connection (SPC) service assumes that both source
 and destination user-to-network connection segments are provisioned
 while the network connection segment is set up via the control plane.
 For example when the initial request is received from an external
 source, e.g. from a management system, there is an implicit
 assumption that the control plane has adequate information to
 determine the specific destination (network-to-user) link connection
 to use.  Support for CR-LDP is provided by the use of the Egress
 Label TLV as defined in the OIF UNI 1.0 section 11.7.5 [6] from the
 Optical Internetworking Forum and in RFC3476 [7].

3. CR-LDP Messages for ASON

 This section describes the formats and the procedures of the two
 messages that are required for ASON call and connection control
 separation.  Those messages are the Call Setup messages and the Call
 Release message.

Aboul-Magd Informational [Page 3] RFC 3475 CR-LDP Extensions for ASON March 2003

3.1 Call Setup Message

 The format of the Call Setup message is:
     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |0|  Call Setup (0x0500)        |      Length                   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                           Message ID                          |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                           Source ID TLV                       |
    ~                                                               ~
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                           Dest ID  TLV                        |
    ~                                                               ~
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                           Call ID TLV                         |
    ~                                                               ~
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                       Call Capability TLV                     |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                      Optional Parameters                      |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 Message ID:
    Is as defined in RFC3036 [4].
 Source ID TLV:
    Is as defined in UNI 1.0 [6] and in [7].
 Dest ID TLV:
    Is as defined in UNI 1.0 [6] and in [7].
 Call ID TLV:
    Is as defined in section 4.1 of this document.
 Call Capability TLV:
   Is as defined in section 4.2 of this document.

Aboul-Magd Informational [Page 4] RFC 3475 CR-LDP Extensions for ASON March 2003

3.1.2 Call Setup Procedure

 The Calling party sends the Call Setup message whenever a new call
 needs to be set up with no connection associated with it.  The Call
 Setup message shall contain all the information required by the
 network to process the call.  In particular, the Call Setup message
 shall include the calling and called party addresses as specified by
 the Source ID and Dest ID TLV.  The setup message must include Call
 ID TLV.  The call control entity shall identify the call using the
 selected identifier for the lifetime of the call.  The Call Setup
 message shall progress through the network to the called party.  The
 called party may accept or reject the incoming call.  An LDP
 Notification message with the appropriate status code shall be used
 to inform the calling party whether the setup is successful.  The
 call can be rejected by either the network, e.g. for policy reasons,
 or by the called party.

3.2 The Call Release Message

 This format of the Call Release message is:
     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |0| Call Release (0x0501)       |      Length                   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                           Message ID                          |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                           Source ID TLV                       |
    ~                                                               ~
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                           Dest ID TLV                         |
    ~                                                               ~
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                           Call ID TLV                         |
    ~                                                               ~
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                          Optional Parameters                  |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Aboul-Magd Informational [Page 5] RFC 3475 CR-LDP Extensions for ASON March 2003

3.2.1 Call Release Procedure

 The Call Release message is sent by any entity of the network to
 terminate an already established call.  The Call Release message must
 include the Call ID TLV of the call to be terminated.  Confirmation
 of call release is indicated to the request initiator using a
 Notification message with the appropriate status code.  Reception and
 processing of the Call Release message must trigger the release of
 all connections that are associated with that call.  Connection
 release follows the normal CR-LDP procedure using Label Release and
 Label Withdraw messages.

4. CR-LDP TLVs for ASON

 This section describes the operator specific Call ID TLV, the
 globally unique Call ID TLV, the Call Capability TLV and the
 Crankback TLV introduced for ASON.

4.1 Call ID TLV

 An established call may be identified by a Call ID.  The Call ID is a
 globally unique identifier that is set by the source network.  The
 structure for the Call ID (to guarantee global uniqueness) is to
 concatenate a globally unique fixed identifier (composed of country
 code, carrier code, unique access point code) with an operator
 specific identifier (where the operator specific identifier is
 composed of ingress network element (NE) address and a local
 Identifier).
 Therefore, a generic CALL_ID with global uniqueness includes <global
 Id> (composed of <country code> plus <carrier code> plus <unique
 access point code>) and <operator specific Id> (composed of <NE
 address> plus <local Identifier>).  For a CALL_ID that requires only
 operator specific uniqueness, only the <operator specific Id> is
 needed, while for a CALL_ID that is required to be globally unique
 both <global ID> and <operator specific Id> are needed.
 The <global Id> shall consist of a three-character International
 Segment (the <country code>) and a twelve-character National Segment
 (the <carrier code> plus <unique access point code>).  These
 characters shall be coded according to ITU-T Recommendation T.50.

Aboul-Magd Informational [Page 6] RFC 3475 CR-LDP Extensions for ASON March 2003

 The format of the operator specific (Op-Sp) CALL_ID TLV:
     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |U|F|Op-Sp Call ID (0x0831)     |      Length                   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                   NE Address (NEA Sub TLV)                    |
    ~                                                               ~
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                        Local Identifier                       |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                  Local Identifier (continued)                 |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 NEA Sub TLV:
    The Source NE Address is an address of the transport network
    element controlled by the source network.  Its length can be 4, 6,
    16, or 20 bytes long.  The NEA Sub TLV is TLV Type 1.
 Local Identifier:
    A 64-bit identifier that remains constant over the life of the
    call.
 The format of the globally unique (GU) Call ID TLV:
     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |U|F|GU Call ID (0x0832)        |      Length                   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | Reserved      |                    IS                         |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                             NS                                |
    |                                                               |
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                   NE Address (NEA Sub TLV)                    |
    ~                                                               ~
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                        Local Identifier                       |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                  Local Identifier (continued)                 |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Aboul-Magd Informational [Page 7] RFC 3475 CR-LDP Extensions for ASON March 2003

 International Segment (IS):
    To be coded according to ITU-T recommendation T.50.  The
    International Segment (IS) field provides a 3 character ISO 3166
    Geographic/Political Country Code.  The country code is based on
    the three-character uppercase alphabetic ISO 3166 Country Code
    (e.g., USA, FRA).
 National Segment (NS):
    The National Segment (NS) field consists of two sub-fields:
  1. the first subfield contains the ITU Carrier Code
  2. the second subfield contains a Unique Access Point Code.
    The ITU Carrier Code is a code assigned to a network
    operator/service provider, maintained by the ITU-T
    Telecommunication Service Bureauin association with Recommendation
    M.1400.  This code consists of 1-6 left-justified alphabetic, or
    leading alphabetic followed by numeric, characters (bytes).  If
    the code is less than 6 characters (bytes), it is padded with a
    trailing NULL to fill the subfield.
    The Unique Access Point Code is a matter for the organization to
    which the country code and ITU carrier code have been assigned,
    provided that uniqueness is guaranteed.  This code consists of 1-6
    characters (bytes), trailing NULL, completing the 12-character
    National Segment.  If the code is less than 6 characters, it is
    padded by a trailing NULL to fill the subfield.
 Format of the National Segment
     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                       ITU carrier code                        |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | ITU carrie dode (cont)        |  Unique access point code     |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |               Unique access point code (continued)            |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

4.1.1 Call ID Procedure

 The following processing rules are applicable to the CALL ID TLV:
  1. For initial calls, the calling/originating party call controller

must set the CALL ID values to all-zeros.

Aboul-Magd Informational [Page 8] RFC 3475 CR-LDP Extensions for ASON March 2003

  1. For a new call request, the source networks call controller (SNCC)

sets the appropriate type and value for the CALL ID.

  1. For an existing call (in case Call ID is non zero) the SNCC

verifies existence of the call.

  1. Intermediate nodes are not allowed to alter the Call ID TLV set by

the ingress node.

  1. The destination user/client receiving the request uses the CALL ID

values as a reference to the requested call between the source

    user and itself.  Subsequent actions related to the call uses the
    CALL ID as the reference identifier.

4.2 Call Capability TLV

 The format of the Call Capability TLV is:
     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |U|F| Call Capabaility(0x0833)  |      Length                   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                       Call Capability                         |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 The Call Capability TLV contains a 4 byte Call Capability field.  The
 Call Capability Field is used to explicitly indicate the
 configuration potentiality of the call.
 An example of values of the Call Capability field is:
    0x0000   Point to Point call

4.3 Crankback TLV

 Crankback requires that when the Label Request message is blocked at
 a particular node due to unavailable resources, the node will inform
 the initiator of the Label Request message of the location of the
 blockage.  The initiator can then re-compute new explicit routes that
 avoid the area where resource shortage is detected.  A new Label
 Request message is sent that includes the new route.
 The support of crankback in CR-LDP is facilitated by the introduction
 of a Crankback TLV.  An LDP Notification message is used to inform
 the Label Request message initiator of the blocking condition.  The
 Notification message includes the Crankback TLV that indicates the
 location of resource shortage.  The location of the resource shortage
 is identified using the ER-HOP TLV.  The encoding of the Crankback
 TLV is:

Aboul-Magd Informational [Page 9] RFC 3475 CR-LDP Extensions for ASON March 2003

     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |U|F| Crankback(0x0834)         |      Length                   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    ~                       ER-HOP TLV                              ~
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 The ER-HOP TLV is specified in rfc3212 [3], and consists of an n x 4
 bytes field, it could e.g. contain an IPv4 or an IPv6 address.

5. Additional Error Codes

 G.7713 includes a number of error codes that are currently not
 defined in earlier CR-LDP related RFCs.  The list of those error
 conditions is given below:
    Invalid SNP ID (0x04000009)
    Calling Party busy (0x0400000a)
    Unavailable SNP ID (0x0400000b)
    Invalid SNPP ID (0x0400000c)
    Unavailable SNPP ID (0x0400000d)
    Failed to create SNC (0x0400000e)
    Failed to establish LC (0x040000f)
    Invalid Source End-User Name (0x04000010)
    Invalid Destination End-User Name (0x04000011)
    Invalid CoS (0x04000012)
    Unavailable CoS (0x04000013)
    Invalid GoS (0x04000014)
    Unavailable GoS (0x04000015)
    Failed Security Check (0x04000016)
    TimeOut (0x04000017)
    Invalid Call Name (0x04000018)
    Failed to Release SNC (0x04000019)
    Failed to Free LC (0x0400001a)
 Acronyms used in above error codes:
    SNP    Sub-network Point
    SNPP   Sub-network Point Pool
    SNC    Sub-network Connection
    LC     Link Connection
    CoS    Class of Service
    GoS    Grade of Service

Aboul-Magd Informational [Page 10] RFC 3475 CR-LDP Extensions for ASON March 2003

6. IANA Consideration

 This document uses the LDP RFC 3036 [4] name spaces; see
 http://www.iana.org/assignments/ldp-namespaces.
    Call Setup (0x0500)
    Call Release (0x0501)
 The assignment for the following TLVs:
    Op-Sp Call ID TLV (0x0831)
    GU Call ID TLV (0x0832)
    Call Capability TLV (0x0833)
    Crankback TLV (0x0834)
 The assignment for the new error codes as listed in section 5 of this
 document.

9. Security Considerations

 This document does not introduce any new security concerns other than
 those defined in RFC 3036 and RFC 3212.
 Security aspects (if any) w.r.t. the G.8080 and G.7713 documents need
 to be addressed in those documents.

10. Normative References

 [1] Architecture for Automatically Switched Optical Network (ASON),
     ITU-T recommendation G.8080, Nov. 2001
 [2] Distributed Call and Connection Management (DCM), ITU-T
     recommendation G.7713, Dec. 2001
 [3] Jamoussi, B., Ed., Andersson, L., Callon, R., Dantu, R., Wu, L.,
     Doolan, P., Worster, T., Feldman, N., Fredette, A., Girish, M.,
     Gray, E., Heinanen, J., Kilty, T. and A. Malis, "Constraint-Based
     LSP Setup using LDP", RFC 3212, January 2002.
 [4] Andersson, L., Doolan, P., Feldman, N., Fredette, A. and B.
     Thomas, "LDP Specifications", RFC 3036, January 2001.
 [5] Ashwood-Smith, P. and L. Berger, (Editors),"Generalized Multi-
     Protocol Label Switching (GMPLS) Signaling Constraint-based
     Routed Label Distribution Protocol (CR-LDP) Extensions", RFC
     3472, January 2003.

Aboul-Magd Informational [Page 11] RFC 3475 CR-LDP Extensions for ASON March 2003

 [6] UNI 1.0 Signaling Specification, The Optical Internetworking
     Forum, http://www.oiforum.com/public/UNI_1.0_ia.html
 [7] Rajagopalan, B., "Label Distribution Protocol (LDP) and Resource
     ReserVation Protocol (RSVP) Extensions for Optical UNI
     Signaling", RFC 3476, March 2003.
 [8] Distributed Call and Connection Management signalling using GMPLS
     CR-LDP, ITU G.7713.3, Januray 2003.

11. Intellectual Property

 The IETF takes no position regarding the validity or scope of any
 intellectual property or other rights that might be claimed to
 pertain to the implementation or use of the technology described in
 this document or the extent to which any license under such rights
 might or might not be available; neither does it represent that it
 has made any effort to identify any such rights.  Information on the
 IETF's procedures with respect to rights in standards-track and
 standards-related documentation can be found in RFC 2028.  Copies of
 claims of rights made available for publication and any assurances of
 licenses to be made available, or the result of an attempt made to
 obtain a general license or permission for the use of such
 proprietary rights by implementors or users of this specification can
 be obtained from the IETF Secretariat.
 The IETF invites any interested party to bring to its attention any
 copyrights, patents or patent applications, or other proprietary
 rights which may cover technology that may be required to practice
 this standard.  Please address the information to the IETF Executive
 Director.

12. Author's Addresses

 Osama Aboul-Magd
 Nortel Networks
 P.O. Box 3511, Station C
 Ottawa, Ontario, Canada
 K1Y 4H7
 Phone: 613-599-9104
 EMail: osama@nortelnetworks.com

Aboul-Magd Informational [Page 12] RFC 3475 CR-LDP Extensions for ASON March 2003

13. Full Copyright Statement

 Copyright (C) The Internet Society (2003).  All Rights Reserved.
 This document and translations of it may be copied and furnished to
 others, and derivative works that comment on or otherwise explain it
 or assist in its implementation may be prepared, copied, published
 and distributed, in whole or in part, without restriction of any
 kind, provided that the above copyright notice and this paragraph are
 included on all such copies and derivative works.  However, this
 document itself may not be modified in any way, such as by removing
 the copyright notice or references to the Internet Society or other
 Internet organizations, except as needed for the purpose of
 developing Internet standards in which case the procedures for
 copyrights defined in the Internet Standards process must be
 followed, or as required to translate it into languages other than
 English.
 The limited permissions granted above are perpetual and will not be
 revoked by the Internet Society or its successors or assigns.
 This document and the information contained herein is provided on an
 "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
 TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
 BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
 HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
 MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

 Funding for the RFC Editor function is currently provided by the
 Internet Society.

Aboul-Magd Informational [Page 13]

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