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rfc:rfc7570

Internet Engineering Task Force (IETF) C. Margaria, Ed. Request for Comments: 7570 Juniper Category: Standards Track G. Martinelli ISSN: 2070-1721 Cisco

                                                              S. Balls
                                                             B. Wright
                                                            Metaswitch
                                                             July 2015

Label Switched Path (LSP) Attribute in the Explicit Route Object (ERO)

Abstract

 RFC 5420 extends RSVP-TE to specify or record generic attributes that
 apply to the whole of the path of a Label Switched Path (LSP).  This
 document defines an extension to the RSVP Explicit Route Object (ERO)
 and Record Route Object (RRO) to allow them to specify or record
 generic attributes that apply to a given hop.

Status of This Memo

 This is an Internet Standards Track document.
 This document is a product of the Internet Engineering Task Force
 (IETF).  It represents the consensus of the IETF community.  It has
 received public review and has been approved for publication by the
 Internet Engineering Steering Group (IESG).  Further information on
 Internet Standards is available in Section 2 of RFC 5741.
 Information about the current status of this document, any errata,
 and how to provide feedback on it may be obtained at
 http://www.rfc-editor.org/info/rfc7570.

Copyright Notice

 Copyright (c) 2015 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.

Margaria, et al. Standards Track [Page 1] RFC 7570 General ERO LSP Parameters July 2015

Table of Contents

 1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
 2.  ERO Hop Attributes Subobject  . . . . . . . . . . . . . . . .   3
   2.1.  Encoding  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.2.  Hop Attributes TLVs . . . . . . . . . . . . . . . . . . .   4
   2.3.  Procedures  . . . . . . . . . . . . . . . . . . . . . . .   4
 3.  RRO Hop Attributes Subobject  . . . . . . . . . . . . . . . .   6
   3.1.  Encoding  . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.2.  Procedures  . . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.1.  Subobject Presence Rule . . . . . . . . . . . . . . .   6
     3.2.2.  Reporting Compliance with ERO Hop Attributes  . . . .   7
     3.2.3.  Compatibility with RRO Attributes Subobject . . . . .   7
 4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   4.1.  ERO Hop Attributes Subobject  . . . . . . . . . . . . . .   8
   4.2.  RRO Hop Attributes Subobject  . . . . . . . . . . . . . .   8
   4.3.  Existing Attribute Flags  . . . . . . . . . . . . . . . .   8
   4.4.  Existing LSP Attribute TLVs . . . . . . . . . . . . . . .  10
 5.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
 6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
   6.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
   6.2.  Informative References  . . . . . . . . . . . . . . . . .  13
 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  14
 Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1. Introduction

 Generalized MPLS (GMPLS) Traffic Engineering (TE) Label Switched
 Paths (LSPs) can be route constrained by making use of the Explicit
 Route Object (ERO) and related subobjects as defined in [RFC3209],
 [RFC3473], [RFC3477], [RFC4873], [RFC4874], [RFC5520], and [RFC5553].
 Several documents have identified the need for attributes that can be
 targeted at specific hops in the path of an LSP, including [RFC6163],
 [WSON-SIG], [RFC7571], or [OBJ-FUN].  This document provides a
 generic mechanism for use by these other documents.
 RSVP already supports generic extension of LSP attributes in
 [RFC5420].  In order to support current and future ERO constraint
 extensions, this document provides a mechanism to define per-hop
 attributes.
 The document describes a generic mechanism for carrying information
 related to specific nodes when signaling an LSP.  This document does
 not restrict what that information can be used for.  The defined
 approach builds on LSP attributes defined in [RFC5420] and enables

Margaria, et al. Standards Track [Page 2] RFC 7570 General ERO LSP Parameters July 2015

 attributes to be expressed in ERO and Secondary Explicit Route
 Objects (SEROs).  A new ERO subobject is defined, containing a list
 of generic per-hop attributes.

1.1. Requirements Language

 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].

2. ERO Hop Attributes Subobject

 The ERO Hop Attributes subobject is OPTIONAL.  If used, it is carried
 in the ERO or SERO.  The subobject uses the standard format of an ERO
 subobject.

2.1. Encoding

 The length is variable and content is a list of Hop Attributes TLVs
 defined in Section 2.2.  The size of the ERO subobject limits the
 size of the Hop Attributes TLV to 250 bytes.  The typical size of
 currently defined and forthcoming LSP_ATTRIBUTE TLVs applicable to a
 specific hop (WSON_SIGNALING, Objective Function (OF), and Metric) is
 not foreseen to exceed this limit.
 The ERO Hop Attributes subobject is defined as follows:
    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
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |L|    Type     |     Length    |    Reserved                 |R|
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                                                               |
    //                  Hop Attributes TLVs                        //
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 The L, Type, and Length parameters are as defined in [RFC3209],
 Section 4.3.3.  The L bit MUST be set to 0.  The Type for the ERO Hop
 Attributes subobject is 35.  The Hop Attributes TLVs are encoded as
 defined in Section 2.2.
 Reserved:  Reserved MUST be set to 0 when the subobject is inserted
    in the ERO, MUST NOT be changed when a node processes the ERO, and
    MUST be ignored on the node addressed by the preceding ERO
    subobjects.

Margaria, et al. Standards Track [Page 3] RFC 7570 General ERO LSP Parameters July 2015

 R: This bit reflects the LSP_REQUIRED_ATTRIBUTE and LSP_ATTRIBUTE
    semantic defined in [RFC5420].  When set, it indicates required
    hop attributes to be processed by the node.  When cleared, it
    indicates that the hop attributes are not required as described in
    Section 2.3.
 Hop Attributes TLVs:  The TLVs as defined in Section 2.2.

2.2. Hop Attributes TLVs

 ERO attributes carried by the new objects defined in this document
 are encoded within TLVs.  Each object MAY contain one or more TLVs.
 There are no ordering rules for TLVs, and interpretation SHOULD NOT
 be placed on the order in which TLVs are received.  The TLV format is
 defined in [RFC5420], Section 3.
 The Attribute Flags TLV defined in [RFC5420] is carried in an ERO Hop
 Attributes subobject.  Flags set in the Attribute Flags TLV [RFC5420]
 carried in an ERO Hop Attributes subobject SHALL be interpreted in
 the context of the received ERO.  Only a subset of defined flags are
 defined as valid for use in Attribute Flags TLV carried in an ERO Hop
 Attributes subobject.  Invalid flags SHALL be silently ignored.
 Unknown flags SHOULD trigger the generation of a PathErr with Error
 Code "Unknown Attributes Bit" as defined in [RFC5420], Section 5.2.
 The set of valid flags are defined in Section 4.3.
 The presence and ordering rule of the Attribute Flags TLV in an ERO
 Hop Attributes subobject is defined by each Flag.  A document
 defining a flag to be used in an Attribute Flags TLV carried in the
 ERO Hop Attributes subobject has to describe:
 o  after which kinds of ERO subobject the flag is valid,
 o  if ordering of the flag and other ERO subobjects associated with
    the same hop (e.g., Label subobjects) is significant,
 o  if ordering is significant, how the flag is interpreted in
    association with the preceding subobjects, and
 o  any flag modification rules that might apply.

2.3. Procedures

 As described in [RFC3209], the ERO is managed as a list of subobjects
 each identifying a specific entity, an abstract node, or a link that
 defines a waypoint in the network path.  Identifying subobjects of
 various types are defined in [RFC3209], [RFC3477], [RFC4873],
 [RFC4874], [RFC5520], and [RFC5553].

Margaria, et al. Standards Track [Page 4] RFC 7570 General ERO LSP Parameters July 2015

 [RFC3473] modified the ERO list by allowing one or two Label
 subobjects to be interposed in the list after a subobject identifying
 a link.  One or more ERO Hop Attributes subobjects applicable to a
 particular hop MAY be inserted directly after any of the existing
 identifying subobjects defined in[RFC3209], [RFC3477], [RFC4873],
 [RFC4874], [RFC5520], and [RFC5553].  If any Label subobjects are
 present for a hop, the ERO Hop Attributes subobject(s) MAY also be
 inserted after the Label subobjects.
 The attributes specified in an ERO Hop Attributes subobject apply to
 the immediately preceding subobject(s) in the ERO subobject list.
 A document defining a specific Hop Attributes TLV has to describe:
 o  after which kinds of ERO subobject they are valid,
 o  if ordering of the Hop Attributes subobject and other ERO
    subobjects associated with the same hop (e.g., Label subobjects)
    is significant,
 o  if ordering is significant, how the attribute is interpreted in
    association with the preceding ERO subobjects, and
 o  any TLV modification rules that might apply.
 For instance, subobject presence rules can be defined by describing
 rules similar to [RFC4990], Section 6.1.
 If a node is processing an ERO Hop Attributes subobject and does not
 support the handling of the subobject, it will behave as described in
 [RFC3209] when an unrecognized ERO subobject is encountered.  This
 node will return a PathErr with Error Code "Routing Error" and Error
 Value "Bad EXPLICIT_ROUTE object" with the EXPLICIT_ROUTE object
 included, truncated (on the left) to the offending unrecognized
 subobject.
 When the R bit is set, a node MUST examine the attributes TLV present
 in the subobject following the rules described in [RFC5420],
 Section 5.2.  When the R bit is not set, a node MUST examine the
 attributes TLV present in the subobject following the rules described
 in [RFC5420], Section 4.2.
 A node processing an ERO Hop Attributes subobject with a Hop
 Attributes TLV longer than the ERO subobject SHOULD return a PathErr
 with Error Code "Routing Error" and Error Value "Bad EXPLICIT_ROUTE
 object" with the EXPLICIT_ROUTE object included, truncated (on the
 left) to the offending malformed subobject.  A processing node MUST

Margaria, et al. Standards Track [Page 5] RFC 7570 General ERO LSP Parameters July 2015

 NOT originate a Hop Attributes TLV longer than the ERO Hop Attributes
 subobject.  The processing of the Hop Attributes TLVs SHOULD be
 described in the documents defining them.

3. RRO Hop Attributes Subobject

 In some cases, it is important to determine if an OPTIONAL hop
 attribute has been processed by a node.

3.1. Encoding

 The RRO Hop Attributes subobject is OPTIONAL.  If used, it is carried
 in the RECORD_ROUTE object.  The subobject uses the standard format
 of an RRO subobject.
 The RRO Hop Attributes subobject is defined as follows:
     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
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |      Type     |     Length    |    Reserved                   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                                                               |
    //                  Hop Attributes TLVs                        //
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 The Type and Length parameters are as defined in [RFC3209],
 Section 4.4.1.  The Type for the RRO Hop Attributes subobject is 35.
 The Hop Attributes TLVs are encoded as defined in Section 2.2.
 Reserved:  Reserved MUST be set to 0 when the subobject is inserted
    in the RRO, MUST NOT be changed when a node processes the RRO, and
    MUST be ignored on the node addressed by the preceding RRO
    subobjects.
 Hop Attributes TLVs:  The processed or additional Hop Attributes
    TLVs, using the format defined in Section 2.2.

3.2. Procedures

3.2.1. Subobject Presence Rule

 The RRO rules defined in [RFC3209] are not changed.  The RRO Hop
 Attributes subobject MUST be pushed after the RRO Attributes
 subobject (if present) as defined in [RFC5420].  The RRO Hop
 Attributes subobject MAY be present between a pair of subobjects
 identifying the Label Switching Router (LSR) or links.  Unless local

Margaria, et al. Standards Track [Page 6] RFC 7570 General ERO LSP Parameters July 2015

 policy applies, all such subobjects SHOULD be forwarded unmodified by
 transit LSRs.
 It is noted that a node (e.g., a domain edge node) MAY edit the RRO
 to prune/modify the RRO, including the RRO Hop Attributes subobject
 before forwarding due to confidentiality policy or other reasons (for
 instance, RRO size reduction).

3.2.2. Reporting Compliance with ERO Hop Attributes

 To report that an ERO hop attribute has been considered, or to report
 an additional attribute, an LSR can add a RRO Hop Attributes
 subobject with the Hop Attributes TLV, which describes the attribute
 to be reported.  The requirement to report compliance MUST be
 specified in the document that defines the usage of a hop attribute.

3.2.3. Compatibility with RRO Attributes Subobject

 The RRO Hop Attributes subobject extends the capability of the RRO
 Attributes subobject defined in [RFC5420], Section 7.2 by allowing
 the node to report the attribute value.  The mechanism defined in
 this document is compatible with the RRO Attributes subobject using
 the following procedures.
 For LSP attributes signaled in the LSP_ATTRIBUTES or
 LSP_REQUIRED_ATTRIBUTES objects, a node SHOULD use the RRO Attributes
 subobject to report processing of those attributes.
 For LSP attributes signaled in the ERO Hop Attributes subobject and
 not in the LSP_ATTRIBUTES or LSP_REQUIRED_ATTRIBUTES objects, if a
 node desires to report the attributes, it SHOULD use the RRO Hop
 Attributes subobject and SHOULD NOT use the RRO Attributes subobject.
 Ingress nodes not supporting the RRO Hop Attributes subobject will
 drop the information, as described in [RFC3209], Section 4.4.5.
 A node can use the RRO Hop Attributes subobject to report an LSP
 attribute signaled in LSP_ATTRIBUTES or LSP_REQUIRED_ATTRIBUTES only
 if the following conditions are met:
    The attribute and its corresponding flag is allowed on both the
    LSP_ATTRIBUTES or LSP_REQUIRED_ATTRIBUTES and LSP Hop Attributes
    subobject.
    The reporting of an LSP attribute signaled in LSP_ATTRIBUTES or
    LSP_REQUIRED_ATTRIBUTES in the RRO Hop Attribute is specified in
    the document defining that LSP attribute.

Margaria, et al. Standards Track [Page 7] RFC 7570 General ERO LSP Parameters July 2015

4. IANA Considerations

4.1. ERO Hop Attributes Subobject

 IANA manages the "Resource Reservation Protocol (RSVP) Parameters"
 registry located at
 <http://www.iana.org/assignments/rsvp-parameters>.  Per this
 document, IANA has made an allocation in the Sub-object type 20
 EXPLICIT_ROUTE - Type 1 Explicit Route registry.
 This document introduces a new ERO subobject:
           Value  Description       Reference
           ------ ----------------- ------------------------
           35     Hop Attributes    This document, Section 2

4.2. RRO Hop Attributes Subobject

 IANA manages the "Resource Reservation Protocol (RSVP) Parameters"
 registry located at
 <http://www.iana.org/assignments/rsvp-parameters>.  Per this
 document, IANA has made an allocation in the Sub-object type 21
 ROUTE_RECORD - Type 1 Route Record registry.  This value is the same
 as that in Section 4.1.
 This document introduces a new RRO subobject:
           Value  Description       Reference
           ------ ----------------- ------------------------
           35     Hop Attributes    This document, Section 3

4.3. Existing Attribute Flags

 IANA manages the "Attribute Flags" registry as part of the "Resource
 Reservation Protocol-Traffic Engineering (RSVP-TE) Parameters"
 registry located at
 <http://www.iana.org/assignments/rsvp-te-parameters>.  A new column
 in the registry is introduced by this document.  This column
 indicates if the flag is permitted to be used in an Attribute Flags
 TLV carried in the ERO Hop Attributes subobject.  The column uses the
 heading "ERO" and the registry has been updated as follows:

Margaria, et al. Standards Track [Page 8] RFC 7570 General ERO LSP Parameters July 2015

  Bit Name                 Attribute Attribute RRO ERO Reference
  No.                      FlagsPath FlagsResv
  0   End-to-end re-       Yes       No        No  No  [RFC4920]
      routing                                          [RFC5420]
                                                       This Document
  1   Boundary re-routing  Yes       No        No  No  [RFC4920]
                                                       [RFC5420]
                                                       This Document
  2   Segment-based re-    Yes       No        No  No  [RFC4920]
      routing                                          [RFC5420]
                                                       This Document
  3   LSP Integrity        Yes       No        No  No  [RFC4875]
      Required
                                                       This Document
  4   Contiguous LSP       Yes       No        Yes No  [RFC5151]
                                                       This Document
  5   LSP stitching        Yes       No        Yes No  [RFC5150]
      desired
                                                       This Document
  6   Pre-Planned LSP Flag Yes       No        No  No  [RFC6001]
                                                       This Document
  7   Non-PHP behavior     Yes       No        Yes No  [RFC6511]
      flag
                                                       This Document
  8   OOB mapping flag     Yes       No        Yes No  [RFC6511]
                                                       This Document
  9   Entropy Label        Yes       Yes       No  No  [RFC6790]
      Capability
                                                       This Document
  10  OAM MEP entities     Yes       Yes       Yes No  [RFC7260]
      desired
                                                       This Document
  11  OAM MIP entities     Yes       Yes       Yes No  [RFC7260]
      desired
                                                       This Document
  12  SRLG collection Flag Yes       Yes       Yes No  [SRLG-COLLECT]
      (TEMPORARY -                                     This Document
      registered
      2014-09-11, expires
      2015-09-11)
 New allocation requests to this registry SHALL indicate the value to
 be used in the ERO column.

Margaria, et al. Standards Track [Page 9] RFC 7570 General ERO LSP Parameters July 2015

4.4. Existing LSP Attribute TLVs

 IANA manages the "Resource Reservation Protocol-Traffic Engineering
 (RSVP-TE) Parameters" registry located at
 <http://www.iana.org/assignments/rsvp-te-parameters>.  The
 "Attributes TLV Space" registry manages the following attributes, as
 defined in [RFC5420]:
 o  TLV Type (T-field value)
 o  TLV Name
 o  Whether allowed on LSP_ATTRIBUTES object
 o  Whether allowed on LSP_REQUIRED_ATTRIBUTES object
 Per this document, IANA has added the following information for each
 TLV in the RSVP TLV type identifier registry.
 o  Whether allowed on LSP Hop Attributes ERO subobject
 The existing registry has been modified for existing TLVs as follows.
 The following abbreviations are used below:
 LSP_A:  Whether allowed on LSP_ATTRIBUTES object.
 LSP_RA:  Whether allowed on LSP_REQUIRED_ATTRIBUTES object.
 HOP_A:  Whether allowed on LSP Hop Attributes subobject.
       T Name                  LSP_A LSP_RA HOP_A Ref.
       - --------------------- ----- ------ ----- --------------
       1 Attribute Flags       Yes   Yes    Yes   [RFC5420]
                                                  This Document
       2 Service ID TLV        Yes   No     No    [RFC6060]
                                                  This Document
       3 OAM Configuration TLV Yes   Yes    No    [RFC7260]
                                                  This Document

5. Security Considerations

 This document adds a new subobject in the EXPLICIT_ROUTE and the
 ROUTE_RECORD objects carried in RSVP messages used in MPLS and GMPLS
 signaling.  It builds on mechanisms defined in [RFC3209] and
 [RFC5420] and does not introduce any new security.  The existing
 security considerations described in [RFC2205], [RFC3209], [RFC3473],
 and [RFC5420] do apply.

Margaria, et al. Standards Track [Page 10] RFC 7570 General ERO LSP Parameters July 2015

 As with any RSVP-TE signaling request, the procedures defined in this
 document permit the transfer and reporting of functional preferences
 on a specific node.  The mechanism added in this document does allow
 more control of LSP attributes at a given node.  A node SHOULD check
 the hop attributes against its policies and admission procedures as
 it does with other inputs.  A node MAY reject the message using
 existing RSVP Error Codes like "Policy Control Failure" or "Admission
 Control Failure".  The node MAY also, depending on the specific TLV
 procedures, modify the requested attribute.  This can reveal
 information about the LSP request and status to anyone with
 unauthorized access.  The mechanism described in this document does
 not contribute to this issue, which can be only resolved by
 encrypting the content of the whole signaling message.
 In addition, the reporting of attributes using the RRO can reveal
 details about the node that the operator wishes to remain
 confidential.  The same strategy and policies that apply to other RRO
 subobjects also apply to this new mechanism.  It is RECOMMENDED that
 domain boundary policies take the releasing of RRO hop attributes
 into consideration.

6. References

6.1. Normative References

 [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
            Requirement Levels", BCP 14, RFC 2119,
            DOI 10.17487/RFC2119, March 1997,
            <http://www.rfc-editor.org/info/rfc2119>.
 [RFC2205]  Braden, R., Ed., Zhang, L., Berson, S., Herzog, S., and S.
            Jamin, "Resource ReSerVation Protocol (RSVP) -- Version 1
            Functional Specification", RFC 2205, DOI 10.17487/RFC2205,
            September 1997, <http://www.rfc-editor.org/info/rfc2205>.
 [RFC3209]  Awduche, D., Berger, L., Gan, D., Li, T., Srinivasan, V.,
            and G. Swallow, "RSVP-TE: Extensions to RSVP for LSP
            Tunnels", RFC 3209, DOI 10.17487/RFC3209, December 2001,
            <http://www.rfc-editor.org/info/rfc3209>.
 [RFC3473]  Berger, L., Ed., "Generalized Multi-Protocol Label
            Switching (GMPLS) Signaling Resource ReserVation Protocol-
            Traffic Engineering (RSVP-TE) Extensions", RFC 3473,
            DOI 10.17487/RFC3473, January 2003,
            <http://www.rfc-editor.org/info/rfc3473>.

Margaria, et al. Standards Track [Page 11] RFC 7570 General ERO LSP Parameters July 2015

 [RFC3477]  Kompella, K. and Y. Rekhter, "Signalling Unnumbered Links
            in Resource ReSerVation Protocol - Traffic Engineering
            (RSVP-TE)", RFC 3477, DOI 10.17487/RFC3477, January 2003,
            <http://www.rfc-editor.org/info/rfc3477>.
 [RFC4873]  Berger, L., Bryskin, I., Papadimitriou, D., and A. Farrel,
            "GMPLS Segment Recovery", RFC 4873, DOI 10.17487/RFC4873,
            May 2007, <http://www.rfc-editor.org/info/rfc4873>.
 [RFC4874]  Lee, CY., Farrel, A., and S. De Cnodder, "Exclude Routes -
            Extension to Resource ReserVation Protocol-Traffic
            Engineering (RSVP-TE)", RFC 4874, DOI 10.17487/RFC4874,
            April 2007, <http://www.rfc-editor.org/info/rfc4874>.
 [RFC4875]  Aggarwal, R., Ed., Papadimitriou, D., Ed., and S.
            Yasukawa, Ed., "Extensions to Resource Reservation
            Protocol - Traffic Engineering (RSVP-TE) for Point-to-
            Multipoint TE Label Switched Paths (LSPs)", RFC 4875,
            DOI 10.17487/RFC4875, May 2007,
            <http://www.rfc-editor.org/info/rfc4875>.
 [RFC4920]  Farrel, A., Ed., Satyanarayana, A., Iwata, A., Fujita, N.,
            and G. Ash, "Crankback Signaling Extensions for MPLS and
            GMPLS RSVP-TE", RFC 4920, DOI 10.17487/RFC4920, July 2007,
            <http://www.rfc-editor.org/info/rfc4920>.
 [RFC5150]  Ayyangar, A., Kompella, K., Vasseur, JP., and A. Farrel,
            "Label Switched Path Stitching with Generalized
            Multiprotocol Label Switching Traffic Engineering (GMPLS
            TE)", RFC 5150, DOI 10.17487/RFC5150, February 2008,
            <http://www.rfc-editor.org/info/rfc5150>.
 [RFC5151]  Farrel, A., Ed., Ayyangar, A., and JP. Vasseur, "Inter-
            Domain MPLS and GMPLS Traffic Engineering -- Resource
            Reservation Protocol-Traffic Engineering (RSVP-TE)
            Extensions", RFC 5151, DOI 10.17487/RFC5151, February
            2008, <http://www.rfc-editor.org/info/rfc5151>.
 [RFC5420]  Farrel, A., Ed., Papadimitriou, D., Vasseur, JP., and A.
            Ayyangarps, "Encoding of Attributes for MPLS LSP
            Establishment Using Resource Reservation Protocol Traffic
            Engineering (RSVP-TE)", RFC 5420, DOI 10.17487/RFC5420,
            February 2009, <http://www.rfc-editor.org/info/rfc5420>.

Margaria, et al. Standards Track [Page 12] RFC 7570 General ERO LSP Parameters July 2015

 [RFC5520]  Bradford, R., Ed., Vasseur, JP., and A. Farrel,
            "Preserving Topology Confidentiality in Inter-Domain Path
            Computation Using a Path-Key-Based Mechanism", RFC 5520,
            DOI 10.17487/RFC5520, April 2009,
            <http://www.rfc-editor.org/info/rfc5520>.
 [RFC5553]  Farrel, A., Ed., Bradford, R., and JP. Vasseur, "Resource
            Reservation Protocol (RSVP) Extensions for Path Key
            Support", RFC 5553, DOI 10.17487/RFC5553, May 2009,
            <http://www.rfc-editor.org/info/rfc5553>.
 [RFC6001]  Papadimitriou, D., Vigoureux, M., Shiomoto, K., Brungard,
            D., and JL. Le Roux, "Generalized MPLS (GMPLS) Protocol
            Extensions for Multi-Layer and Multi-Region Networks (MLN/
            MRN)", RFC 6001, DOI 10.17487/RFC6001, October 2010,
            <http://www.rfc-editor.org/info/rfc6001>.
 [RFC6060]  Fedyk, D., Shah, H., Bitar, N., and A. Takacs,
            "Generalized Multiprotocol Label Switching (GMPLS) Control
            of Ethernet Provider Backbone Traffic Engineering (PBB-
            TE)", RFC 6060, DOI 10.17487/RFC6060, March 2011,
            <http://www.rfc-editor.org/info/rfc6060>.
 [RFC6511]  Ali, Z., Swallow, G., and R. Aggarwal, "Non-Penultimate
            Hop Popping Behavior and Out-of-Band Mapping for RSVP-TE
            Label Switched Paths", RFC 6511, DOI 10.17487/RFC6511,
            February 2012, <http://www.rfc-editor.org/info/rfc6511>.
 [RFC6790]  Kompella, K., Drake, J., Amante, S., Henderickx, W., and
            L. Yong, "The Use of Entropy Labels in MPLS Forwarding",
            RFC 6790, DOI 10.17487/RFC6790, November 2012,
            <http://www.rfc-editor.org/info/rfc6790>.
 [RFC7260]  Takacs, A., Fedyk, D., and J. He, "GMPLS RSVP-TE
            Extensions for Operations, Administration, and Maintenance
            (OAM) Configuration", RFC 7260, DOI 10.17487/RFC7260, June
            2014, <http://www.rfc-editor.org/info/rfc7260>.

6.2. Informative References

 [OBJ-FUN]  Ali, Z., Swallow, G., Filsfils, C., Fang, L., Kumaki, K.,
            Kunze, R., Ceccarelli, D., and X. Zhang, "Resource
            ReserVation Protocol-Traffic Engineering (RSVP-TE)
            Extension for Signaling Objective Function and Metric
            Bound", Work in Progress, draft-ali-ccamp-rc-objective-
            function-metric-bound-05, February 2014.

Margaria, et al. Standards Track [Page 13] RFC 7570 General ERO LSP Parameters July 2015

 [RFC4990]  Shiomoto, K., Papneja, R., and R. Rabbat, "Use of
            Addresses in Generalized Multiprotocol Label Switching
            (GMPLS) Networks", RFC 4990, DOI 10.17487/RFC4990,
            September 2007, <http://www.rfc-editor.org/info/rfc4990>.
 [RFC6163]  Lee, Y., Ed., Bernstein, G., Ed., and W. Imajuku,
            "Framework for GMPLS and Path Computation Element (PCE)
            Control of Wavelength Switched Optical Networks (WSONs)",
            RFC 6163, DOI 10.17487/RFC6163, April 2011,
            <http://www.rfc-editor.org/info/rfc6163>.
 [RFC7571]  Dong, J., Chen, M., Li, Z., and D. Ceccarelli, "GMPLS
            RSVP-TE Extensions for Lock Instruct and Loopback", RFC
            7571, DOI 10.17487/RFC7571, July 2015,
            <http://www.rfc-editor.org/info/rfc7571>.
 [RSVP-TE-HOPS]
            Kern, A. and A. Takacs, "Encoding of Attributes of LSP
            intermediate hops using RSVP-TE", Work in Progress,
            draft-kern-ccamp-rsvpte-hop-attributes-00, October 2009.
 [SRLG-COLLECT]
            Zhang, F., Dios, O., Li, D., Margaria, C., Hartley, M.,
            and Z. Ali, "RSVP-TE Extensions for Collecting SRLG
            Information", Work in Progress, draft-ietf-teas-rsvp-te-
            srlg-collect-00, December 2014.
 [WSON-SIG]
            Bernstein, G., Xu, S., Lee, Y., Martinelli, G., and H.
            Harai, "Signaling Extensions for Wavelength Switched
            Optical Networks", Work in Progress, draft-ietf-ccamp-
            wson-signaling-10, March 2015.

Acknowledgments

 The authors would like to thank Lou Berger for his directions and
 Attila Takacs for inspiring [RSVP-TE-HOPS].  The authors also thank
 Dirk Schroetter for his contribution to the initial draft versions of
 this document.

Margaria, et al. Standards Track [Page 14] RFC 7570 General ERO LSP Parameters July 2015

Authors' Addresses

 Cyril Margaria (editor)
 Juniper
 200 Somerset Corporate Boulevard, Suite 4001
 Bridgewater, NJ  08807
 United States
 Email: cmargaria@juniper.net
 Giovanni Martinelli
 Cisco
 via Philips 12
 Monza  20900
 Italy
 Phone: +39 039 209 2044
 Email: giomarti@cisco.com
 Steve Balls
 Metaswitch
 100 Church Street
 Enfield  EN2 6BQ
 United Kingdom
 Phone: +44 208 366 1177
 Email: steve.balls@metaswitch.com
 Ben Wright
 Metaswitch
 100 Church Street
 Enfield  EN2 6BQ
 United Kingdom
 Phone: +44 208 366 1177
 Email: Ben.Wright@metaswitch.com

Margaria, et al. Standards Track [Page 15]

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