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PCEP Extension for Native IP Network
draft-ietf-pce-pcep-extension-native-ip-10

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This is an older version of an Internet-Draft whose latest revision state is "Active".
Authors Aijun Wang , Boris Khasanov , Sheng Fang , Ren Tan , Chun Zhu
Last updated 2021-02-04
Replaces draft-wang-pce-pcep-extension-native-ip
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draft-ietf-pce-pcep-extension-native-ip-10
PCE Working Group                                                A. Wang
Internet-Draft                                             China Telecom
Intended status: Standards Track                             B. Khasanov
Expires: August 9, 2021                                       Yandex LLC
                                                                 S. Fang
                                                                  R. Tan
                                             Huawei Technologies,Co.,Ltd
                                                                  C. Zhu
                                                         ZTE Corporation
                                                        February 5, 2021

                  PCEP Extension for Native IP Network
               draft-ietf-pce-pcep-extension-native-ip-10

Abstract

   This document defines the Path Computation Element Communication
   Protocol (PCEP) extension for Central Control Dynamic Routing (CCDR)
   based application in Native IP network.  The scenario and framework
   of CCDR in native IP is described in [RFC8735] and
   [I-D.ietf-teas-pce-native-ip].  This draft describes the key
   information that is transferred between Path Computation Element
   (PCE) and Path Computation Clients (PCC) to accomplish the End to End
   (E2E) traffic assurance in Native IP network under central control
   mode.

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 https://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 August 9, 2021.

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Copyright Notice

   Copyright (c) 2021 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
   (https://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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Capability Advertisemnt . . . . . . . . . . . . . . . . . . .   4
     4.1.  Open message  . . . . . . . . . . . . . . . . . . . . . .   4
   5.  PCEP messages . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  The PCInitiate message  . . . . . . . . . . . . . . . . .   5
     5.2.  The PCRpt message . . . . . . . . . . . . . . . . . . . .   6
   6.  PCECC Native IP TE Procedures . . . . . . . . . . . . . . . .   7
     6.1.  BGP Session Establishment Procedures  . . . . . . . . . .   7
     6.2.  Explicit Route Establish Procedures . . . . . . . . . . .   9
     6.3.  BGP Prefix Advertisement Procedures . . . . . . . . . . .  12
   7.  New PCEP Objects  . . . . . . . . . . . . . . . . . . . . . .  13
     7.1.  CCI Object  . . . . . . . . . . . . . . . . . . . . . . .  13
     7.2.  BGP Peer Info Object  . . . . . . . . . . . . . . . . . .  14
     7.3.  Explicit Peer Route Object  . . . . . . . . . . . . . . .  17
     7.4.  Peer Prefix Association Object  . . . . . . . . . . . . .  18
   8.  End to End Path Protection  . . . . . . . . . . . . . . . . .  20
   9.  New Error-Types and Error-Values Defined  . . . . . . . . . .  20
   10. Deployment Considerations . . . . . . . . . . . . . . . . . .  21
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  22
   12. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  22
     12.1.  Path Setup Type Registry . . . . . . . . . . . . . . . .  22
     12.2.  PCECC-CAPABILITY sub-TLV's Flag field  . . . . . . . . .  22
     12.3.  PCEP Object Types  . . . . . . . . . . . . . . . . . . .  22
     12.4.  PCEP-Error Object  . . . . . . . . . . . . . . . . . . .  23
   13. Contributor . . . . . . . . . . . . . . . . . . . . . . . . .  24
   14. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  24
   15. Normative References  . . . . . . . . . . . . . . . . . . . .  24
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  25

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1.  Introduction

   Generally, Multiprotocol Label Switching Traffic Engineering (MPLS-
   TE) requires the corresponding network devices support Multiprotocol
   Label Switching (MPLS) or Resource ReSerVation Protocol (RSVP)/Label
   Distribution Protocol (LDP) technologies to assure the End-to-End
   (E2E) traffic performance.  But in native IP network, there will be
   no such signaling protocol to synchronize the action among different
   network devices.  It is necessary to use the central control mode
   that described in [RFC8283] to correlate the forwarding behavior
   among different network devices.  Draft [I-D.ietf-teas-pce-native-ip]
   describes the architecture and solution philosophy for the E2E
   traffic assurance in Native IP network via Multi Border Gateway
   Protocol (BGP) solution.  This draft describes the corresponding Path
   Computation Element Communication Protocol (PCEP) extensions to
   transfer the key information about BGP peer info, peer prefix
   association and the explicit peer route on on-path routers.

2.  Conventions used in this document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Terminology

   This document uses the following terms defined in [RFC5440]: PCE,
   PCEP

   The following terms are defined in this document:

   o  CCDR: Central Control Dynamic Routing

   o  E2E: End to End

   o  BPI: BGP Peer Info

   o  EPR: Explicit Peer Route

   o  PPA: Peer Prefix Association

   o  QoS: Quality of Service

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4.  Capability Advertisemnt

4.1.  Open message

   During the PCEP Initialization Phase, PCEP Speakers (PCE or PCC)
   advertise their support of Native IP extensions.

   This document defines a new Path Setup Type (PST) [RFC8408] for
   Native-IP, as follows:

   o  PST = TBD1: Path is a Native IP path as per
      [I-D.ietf-teas-pce-native-ip].

   A PCEP speaker MUST indicate its support of the function described in
   this document by sending a PATH-SETUP-TYPE-CAPABILITY TLV in the OPEN
   object with this new PST included in the PST list.

   [I-D.ietf-pce-pcep-extension-for-pce-controller] defined the PCECC-
   CAPABILITY sub-TLV to exchange information about their PCECC
   capability.  A new flag is defined in PCECC-CAPABILITY sub-TLV for
   Native IP.

   N (NATIVE-IP-TE-CAPABILITY - 1 bit - TBD2): If set to 1 by a PCEP
   speaker, it indicates that the PCEP speaker is capable for TE in
   Native IP network as specified in this document.  The flag MUST be
   set by both the PCC and PCE in order to support this extension.

   If a PCEP speaker receives the PATH-SETUP-TYPE-CAPABILITY TLV with
   the newly defined path setup type, but without the N bit set in
   PCECC-CAPABILITY sub-TLV, it MUST:

   o  Send a PCErr message with Error-Type=10(Reception of an invalid
      object) and Error-Value TBD3(PCECC NATIVE-IP-TE-CAPABILITY bit is
      not set).

   o  Terminate the PCEP session

5.  PCEP messages

   PCECC Native IP TE solution utilizing the existing PCE LSP Initate
   Request message(PCInitiate)[RFC8281], and PCE Report message(PCRpt)
   [RFC8281] to accomplish the multi BGP sessions establishment, E2E TE
   path deployment, and route prefixes advertisement among different BGP
   sessions.  A new PST for Native-IP is used to indicate the path setup
   based on TE in Native IP networks.

   The extended PCInitiate message described in
   [I-D.ietf-pce-pcep-extension-for-pce-controller] is used to download

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   or cleanup central controller's instructions (CCIs).
   [I-D.ietf-pce-pcep-extension-for-pce-controller] specify an object
   called CCI for the encoding of central controller's instructions.
   This document specify a new CCI object-type for Native IP.  The PCEP
   messages are extended in this document to handle the PCECC operations
   for Native IP.  Three new PCEP Objects (BGP Peer Info (BPI) Object,
   Explicit Peer Route (EPR) Object and Peer Prefix Association (PPA)
   Object) are defined in this document.  Refer toSection 7 for detail
   object definitions.

5.1.  The PCInitiate message

   The PCInitiate Message defined in [RFC8281] and extended in
   [I-D.ietf-pce-pcep-extension-for-pce-controller] is further extended
   to support Native-IP CCI.

   The format of the extended PCInitiate message is as follows:

        <PCInitiate Message> ::= <Common Header>
                                 <PCE-initiated-lsp-list>
     Where:
        <Common Header> is defined in [RFC5440]

        <PCE-initiated-lsp-list> ::= <PCE-initiated-lsp-request>
                                     [<PCE-initiated-lsp-list>]

        <PCE-initiated-lsp-request> ::=
                             (<PCE-initiated-lsp-instantiation>|
                              <PCE-initiated-lsp-deletion>|
                              <PCE-initiated-lsp-central-control>)

        <PCE-initiated-lsp-central-control> ::= <SRP>
                                                (<LSP>
                                                <cci-list>)|
                                                ((<BPI>|<EPR>|<PPA>)
                                                <CCI>)

        <cci-list> ::=  <CCI>
                        [<cci-list>]

     Where:
         <cci-list> is as per
         [I-D.ietf-pce-pcep-extension-for-pce-controller].
         <PCE-initiated-lsp-instantiation> and
         <PCE-initiated-lsp-deletion> are as per
         [RFC8281].

        The LSP and SRP object is defined in [RFC8231].

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   When PCInitiate message is used create Native IP instructions, the
   SRP and CCI objects MUST be present.  The error handling for missing
   SRP or CCI object is as per
   [I-D.ietf-pce-pcep-extension-for-pce-controller].  Further only one
   of BPI, EPR, or PPA object MUST be present.  The PLSP-ID within the
   LSP object should be set by PCC uniquely according to the Symbolic
   Path Name TLV that included in the CCI object.  The Symbolic Path
   Name is used by the PCE/PCC to identify uniquely the E2E native IP TE
   path.

   If none of them are present, the receiving PCC MUST send a PCErr
   message with Error-type=6 (Mandatory Object missing) and Error-
   value=TBD4 (Native IP object missing).  If there are more than one of
   BPI, EPR or PPA object are presented, the receiving PCC MUST send a
   PCErr message with Error-type=19(Invalid Operation) and Error-
   value=TBD5(Only one of the BPI, EPR or PPA object can be included in
   this message).

   To cleanup the SRP object must set the R (remove) bit.

5.2.  The PCRpt message

   The PCRpt message is used to acknowledge the Native-IP instructions
   received from the central controller (PCE).

   The format of the PCRpt message is as follows:

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         <PCRpt Message> ::= <Common Header>
                             <state-report-list>
      Where:

         <state-report-list> ::= <state-report>[<state-report-list>]

         <state-report> ::= (<lsp-state-report>|
                             <central-control-report>)

         <lsp-state-report> ::= [<SRP>]
                                <LSP>
                                <path>

         <central-control-report> ::= [<SRP>]
                                      (<LSP>
                                      <cci-list>)|
                                      ((<BPI>|<EPR>|<PPA>)
                                      <CCI>)

       Where:
         <path> is as per [RFC8231] and the LSP and SRP object are
         also defined in [RFC8231].

   The error handling for missing CCI object is as per
   [I-D.ietf-pce-pcep-extension-for-pce-controller].  Further only one
   of BPI, EPR, or PPA object MUST be present.

   If none of them are present, the receiving PCE MUST send a PCErr
   message with Error-type=6 (Mandatory Object missing) and Error-
   value=TBD4 ( Native IP object missing).  If there are more than one
   of BPI, EPR or PPA object are presented, the receiving PCE MUST send
   a PCErr message with Error-type=19(Invalid Operation) and Error-
   value=TBD5(Only one of the BPI, EPR or PPA object can be included in
   this message).

6.  PCECC Native IP TE Procedures

   The detail procedures for the TE in native IP environment are
   described in the following sections.

6.1.  BGP Session Establishment Procedures

   The procedures for establishing the BGP session between two peers is
   shown below, using the PCInitiate and PCRpt message pair.

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   The PCInitiate message should be sent to PCC which acts as BGP
   routers and route reflector.  In the example in Figure 1, it should
   be sent to R1(M1), R3(M2 & M3) and R7(M4), when R3 acts as RR.

   When PCC receives the BPI and CCI object (with the R bit set to 0 in
   SRP object) in PCInitiate message, the PCC should try to establish
   the BGP session with the indicated Peer AS and Local/Peer IP address.

   When PCC creates successfully the BGP session that is indicated by
   the associated information, it should report the result via the PCRpt
   messages, with BPI object included, and the corresponding SRP and CCI
   object.

   When PCC receives this message with the R bit set to 1 in SRP object
   in PCInitiate message, the PCC should clear the BGP session that
   indicated by the BPI object.

   When PCC clears successfully the specified BGP session, it should
   report the result via the PCRpt message, with the BPI object
   included, and the corresponding SRP and CCI object.

                                +------------------+
                    +-----------+       PCE        +----------+
                    |           +--------^---------+          |
                    |                    |                    |
                                M2/M2-R & M3/M3-R
                    |                    |                    |
                    |               +---v---+                 |
                    +---------------+ R3(RR)+-----------------+
                    |               +-------+                 |
                 M1/M1-R                                   M4/M4-R
                    |                                         |
                   +v-+          +--+          +--+         +-v+
                   |R1+----------+R5+----------+R6+---------+R7|
                   ++-+          +--+          +--+         +-++
                    |                                         |
                    |            +--+          +--+           |
                    +------------+R2+----------+R4+-----------+
                                 +--+          +--+
          Figure 1: BGP Session Establishment Procedures(R3 act as RR)

   The message number, message peers, message type and message key
   parameters in the above figures are shown in below table:

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                          Table 1: Message Information
  +------------------------------------------------------------------------------------------+
  | Message No.| Message Peers |   Message Type    |       Message Key Parameters            |
  +------------------------------------------------------------------------------------------+
  |  M1/M1-R   |    PCE/R1     |  PCInitiate/PCRpt |  CC-ID=X1(Symbolic Path Name=Class A)   |
  |            |               |                   |  BPI Object(Local_IP=R1_A,Peer_IP=R3_A) |
  +------------------------------------------------------------------------------------------+
  |  M2/M2-R   |    PCE/R3     |  PCInitiate/PCRpt |  CC-ID=X2(Symbolic Path Name=Class A)   |
  |            |               |                   |  BPI Object(Local_IP=R3_A,Peer_IP=R1_A )|
  +------------------------------------------------------------------------------------------+
  |  M3/M3-R   |    PCE/R3     |  PCInitiate/PCRpt |  CC-ID=X3(Symbolic Path Name=Class A)   |
  |            |               |                   |  BPI Object(Local_IP=R3_A,Peer_IP=R7_A) |
  +------------------------------------------------------------------------------------------+
  |  M4/M4-R   |    PCE/R7     |  PCInitiate/PCRpt |  CC-ID=X4(Symbolic Path Name=Class A)   |
  |            |               |                   |  BPI Object(Local_IP=R7_A,Peer_IP=R3_A) |
  +------------------------------------------------------------------------------------------+

   If the PCC cannot establish the BGP session that required by this
   object, it should report the error values via PCErr message with the
   newly defined error type(Error-type=TBD6) and error value(Error-
   value=TBD7, Peer AS not match; or Error-Value=TBD8, Peer IP can't be
   reached), which is indicated in Section 9

   If the Local_IP or Peer_IP within BPI object is used in other
   existing BGP sessions, the PCC should report such error situation via
   PCErr message with Err-type=TBD6 and error value(Error-value=TBD9,
   Local IP is in use; Error-value=TBD10, Remote IP is in use).

   If the established BGP session is broken after some time, the PCC
   should also report such error via PCErr message with Err-type=TBD6
   and error value(Error-value=TBD11, Existing BGP session is broken).
   Upon receiving such PCErr message, the PCE should select other
   Local_IP/Peer_IP pair to establish the new BGP session.

6.2.  Explicit Route Establish Procedures

   The detail procedures for the explicit route establishment procedures
   is shown below, using PCInitiate and PCRpt message pair.

   The PCInitiate message should be sent to the on-path routers
   respectively.  In the example, for explicit route from R1 to R7, the
   PCInitiate message should be sent to R1(M1), R2(M2) and R4(M3), as
   shown in Figure 2.  For explicit route from R7 to R1, the PCInitiate
   message should be sent to R7(M1), R4(M2) and R2(M3), as shown in
   Figure 3..

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   When PCC receives the EPR and the CCI object (with the R bit set to 0
   in SRP object) in PCInitiate message, the PCC should install the
   explicit route to the the peer.

   When PCC install successfully the explicit route to the peer, it
   should report the result via the PCRpt messages, with EPR object
   included, and the corresponding SRP and CCI object.

   When PCC receives the EPR and the CCI object with the R bit set to 1
   in SRP object in PCInitiate message, the PCC should clear the
   explicit route to the peer that indicated by the EPR object.

   When PCC clear successfully the explicit route that indicated by this
   object, it should report the result via the PCRpt message, with the
   EPR object included, and the corresponding SRP and CCI object.

                             +------------------+
                  +----------+       PCE        +
                  |          +----^-----------^-+
                  |               |           |
                  |               |           |
                  |               | +------+  |
                  +-----------------+R3(RR)+--|-------------+
              M1/M1-R             | +------+  |             |
                  |               |           |             |
                 +v-+      +--+   |           |   +--+    +--+
                 |R1+------+R5+---+-----------|---+R6+----+R7|
                 ++-+      +--+   |           |   +--+    +-++
                  |            M2/M2-R      M3/M3-R         |
                  |               |           |             |
                  |            +--v--+     +--v-+           |
                  +------------+- R2 +-----+ R4 +-----------+
                               +--+--+     +--+-+
         Figure 2: Explicit Route Establish Procedures(From R1 to R7)

   The message number, message peers, message type and message key
   parameters in the above figures are shown in below table:

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                          Table 2: Message Information
  +----------------------------------------------------------------------------------------------+
  | Message No.| Message Peers |   Message Type    |       Message Key Parameters                |
  +----------------------------------------------------------------------------------------------+
  |  M1/M1-R   |    PCE/R1     |  PCInitiate/PCRpt |  CC-ID=X1(Symbolic Path Name=Class A)       |
  |            |               |                   |  EPR Object(Peer Address=R7_A,Next Hop=R2_A)|
  +----------------------------------------------------------------------------------------------+
  |  M2/M2-R   |    PCE/R2     |  PCInitiate/PCRpt |  CC-ID=X2(Symbolic Path Name=Class A)       |
  |            |               |                   |  EPR Object(Peer Address=R7_A,Next Hop=R4_A)|
  +----------------------------------------------------------------------------------------------+
  |  M3/M3-R   |    PCE/R4     |  PCInitiate/PCRpt |  CC-ID=X3(Symbolic Path Name=Class A)       |
  |            |               |                   |  EPR Object(Peer Address=R7_A,Next Hop=R7_A)|
  +----------------------------------------------------------------------------------------------+

                       +------------------+
                       +       PCE        +-----------+
                       +----^-----------^-+           |
                            |           |             |
                            |           |             |
                            | +------+  |             |
            +-----------------+R3(RR)+--|-------------+
            |               | +------+  |         M1/M1-R
            |               |           |             |
           +--+      +--+   |           |   +--+    +-v+
           |R1+------+R5+---+-----------|---+R6+----+R7|
           ++-+      +--+   |           |   +--+    +-++
            |            M3/M3-R      M2/M2-R         |
            |               |           |             |
            |            +--v--+     +--v-+           |
            +------------+- R2 +-----+ R4 +-----------+
                         +--+--+     +--+-+
    Figure 3: Explicit Route Establish Procedures(From R7 to R1)

   The message number, message peers, message type and message key
   parameters in the above figures are shown in below table:

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                                   Table 3: Message Information
  +----------------------------------------------------------------------------------------------+
  | Message No.| Message Peers |   Message Type    |       Message Key Parameters                |
  +----------------------------------------------------------------------------------------------+
  |  M1/M1-R   |    PCE/R7     |  PCInitiate/PCRpt |  CC-ID=X1(Symbolic Path Name=Class A)       |
  |            |               |                   |  EPR Object(Peer Address=R1_A,Next Hop=R4_A)|
  +----------------------------------------------------------------------------------------------+
  |  M2/M2-R   |    PCE/R4     |  PCInitiate/PCRpt |  CC-ID=X2(Symbolic Path Name=Class A)       |
  |            |               |                   |  EPR Object(Peer Address=R1_A,Next Hop=R2_A)|
  +----------------------------------------------------------------------------------------------+
  |  M3/M3-R   |    PCE/R2     |  PCInitiate/PCRpt |  CC-ID=X3(Symbolic Path Name=Class A)       |
  |            |               |                   |  EPR Object(Peer Address=R1_A,Next Hop=R1_A)|
  +----------------------------------------------------------------------------------------------+

   Upon the error occurs, the PCC SHOULD send the corresponding error
   via PCErr message, with an error information (Error-type=TBD6, Error-
   value=TBD12, Explicit Peer Route Error) that defined in Section 9.

   When the peer info that associated with the Symbolic Path Name is not
   the same as the peer info that indicated in BPI object in PCC, an
   error (Error-type=TBD6, Error-value=17, EPR/BPI Peer Info mismatch)
   should be reported via the PCErr message.

6.3.  BGP Prefix Advertisement Procedures

   The detail procedures for BGP prefix advertisement is shown below,
   using PCInitiate and PCRpt message pair.

   The PCInitiate message should be sent to PCC that acts as BGP peer
   router only.  In the example, it should be sent to R1(M1) or R7(M2)
   respectively.

   When PCC receives the PPA and the CCI object (with the R bit set to 0
   in SRP object) in PCInitiate message, the PCC should send the
   prefixes indicated in this object to the appointed BGP peer.

   When PCC sends successfully the prefixes to the appointed BGP peer,
   it should report the result via the PCRpt messages, with PPA object
   included, and the corresponding SRP and CCI object.

   When PCC receives the PPA and the CCI object with the R bit set to 1
   in SRP object in PCInitiate message, the PCC should withdraw the
   prefixes advertisement to the peer that indicated by this object.

   When PCC withdraws successfully the prefixes that indicated by this
   object, it should report the result via the PCRpt message, with the
   PPA object included, and the corresponding SRP and CCI object.

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   The IPv4 prefix MUST only be advertised via the IPv4 BGP session and
   the IPv6 prefix MUST only be advertised via the IPv6 BGP session.  If
   mismatch occur, an error(Error-type=TBD6, Error-value=TBD18, BPI/PPR
   address family mismatch) should be reported via PCErr message.

   When the peer info that associated with the Symbolic Path Name is not
   the same as the peer info that indicated in BPI object in PCC, an
   error (Error-type=TBD6, Error-value=TBD19, PPA/BPI peer info
   mismatch) should be reported via the PCErr message.

                 +------------------+
      +----------+       PCE        +-----------+
      |          +------------------+           |
      |                  +--+                   |
      +------------------+R3+-------------------+
     M1&M1-R             +--+                M2&M2-R
      |                                         |
      +v-+          +--+          +--+         +-v+
      |R1+----------+R5+----------+R6+---------+R7|
      ++-+          +--+          +--+         +-++
      |                                         |
      |                                         |
      |            +--+          +--+           |
      +------------+R2+----------+R4+-----------+
      Figure 4: BGP Prefix Advertisement Procedures

                                   Table 4: Message Information
  +----------------------------------------------------------------------------------------------+
  | Message No.| Message Peers |   Message Type    |       Message Key Parameters                |
  +----------------------------------------------------------------------------------------------+
  |  M1/M1-R   |    PCE/R1     |  PCInitiate/PCRpt |  CC-ID=X1(Symbolic Path Name=Class A)       |
  |            |               |                   |  PPA Object(Peer IP=R7_A,Prefix=1_A)        |
  +----------------------------------------------------------------------------------------------+
  |  M2/M2-R   |    PCE/R7     |  PCInitiate/PCRpt |  CC-ID=X2(Symbolic Path Name=Class A)       |
  |            |               |                   |  PPA Object(Peer IP=R1_A,Prefix=7_A)        |
  +----------------------------------------------------------------------------------------------+

7.  New PCEP Objects

   One new CCI Object and three new PCEP objects are defined in this
   draft.  All new PCEP objects are as per [RFC5440]

7.1.  CCI Object

   The Central Control Instructions (CCI) Object is used by the PCE to
   specify the forwarding instructions is defined in
   [I-D.ietf-pce-pcep-extension-for-pce-controller].  This document
   defines another object-type for Native-IP.

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   CCI Object-Type is TBD13 for Native-IP as below

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                            CC-ID                              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |          Reserved             |             Flags             |
   +---------------------------------------------------------------+
   |                                                               |
   //                        Optional TLV                         //
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

           Figure 5: CCI Object for Native IP

                                 Figure 1

   The field CC-ID is as described in
   [I-D.ietf-pce-pcep-extension-for-pce-controller].  Following fields
   are defined for CCI Object-Type TBD13

   Reserved:  is set to zero while sending, ignored on receipt.

   Flags:  is used to carry any additional information pertaining to the
      CCI.  Currently no flag bits are defined.

   The Symbolic Path Name TLV [RFC8231] MUST be included in the CCI
   Object-Type TBD13 to identify the E2E TE path in Native IP
   environment and MUST be unique.

7.2.  BGP Peer Info Object

   The BGP Peer Info object is used to specify the information about the
   peer that the PCC should establish the BGP relationship with.  This
   object should only be included and sent to the head and end router of
   the E2E path in case there is no Route Reflection (RR) involved.  If
   the RR is used between the head and end routers, then such
   information should be sent to head router, RR and end router
   respectively.

   By default, there MUST be no prefix be distributed via such BGP
   session that established by this object.

   By default, the Local/Peer IP address SHOULD be dedicated to the
   usage of native IP TE solution, and SHOULD NOT be used by other BGP

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   sessions that established by manual or non PCE initiated
   configuration.

   BGP Peer Info Object-Class is TBD14

   BGP Peer Info Object-Type is 1 for IPv4 and 2 for IPv6

   The format of the BGP Peer Info object body for IPv4(Object-Type=1)
   is 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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                      Peer AS Number                           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   ETTL        |              Reserved                         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                    Local IP Address                           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                   Peer IP Address                             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Additional TLVs                              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        Figure 6: BGP Peer Info Object Body Format for IPv4

   The format of the BGP Peer Info object body for IPv6(Object-Type=2)
   is as follows:

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    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                      Peer AS Number                           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   ETTL        |  Tunnel Type  |        Reserved               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   +                                                               +
   |               Local IP Address (16 bytes)                     |
   +                                                               +
   |                                                               |
   +                                                               +
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   +                                                               +
   |               Peer IP Address (16 bytes)                      |
   +                                                               +
   |                                                               |
   +                                                               +
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Additional TLVs                              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         Figure 7: BGP Peer Info Object Body Format for IPv6

   Peer AS Number: 4 Bytes, to indicate the AS number of Remote Peer.

   ETTL: 1 Byte, to indicate the multi hop count for EBGP session.  It
   should be 0 and ignored when Local AS and Peer AS is same.

   Tunnel Type: 1 Byte, indicate the tunnel type that used to transfer
   the traffic that identified by the prefixes that advertised by the
   corresponding BGP peer.  Value 0 indicate no tunnel is used.  Other
   value can refer to the IANA allocation value in "BGP Tunnel
   Encapsulation Attribute Tunnel Types".

   Reserved: is set to zero while sending, ignored on receipt..

   Local IP Address(4/16 Bytes): IP address of the local router, used to
   peer with other end router.  When Object-Type is 1, length is 4
   bytes; when Object-Type is 2, length is 16 bytes.

   Peer IP Address(4/16 Bytes): IP address of the peer router, used to
   peer with the local router.  When Object-Type is 1, length is 4
   bytes; when Object-Type is 2, length is 16 bytes;

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   Additional TLVs: TLVs that associated with this object, can be used
   to convey other necessary information for dynamic BGP session
   establishment.  Its definition is out of the current document.

   When PCC receives BPI object, with Object-Type=1, it should try to
   establish BGP session with the peer in AFI/SAFI=1/1; when PCC
   receives BPI object with Object-Type=2, it should try to establish
   the BGP session with the peer in AFI/SAFI=2/1.  Other BGP
   capabilities,for example, Graceful Restart(GR) that enhance the BGP
   performance should also be negotiated and used by default.

7.3.  Explicit Peer Route Object

   The Explicit Peer Route object is defined to specify the explicit
   peer route to the corresponding peer address on each device that is
   on the E2E assurance path.  This Object should be sent to all the
   devices that locates on the E2E assurance path that calculated by
   PCE.

   The path established by this object should have higher priority than
   other path calculated by dynamic IGP protocol, but should be lower
   priority that the static route configured by manual or NETCONF
   channel.

   Explicit Peer Route Object-Class is TBD15.

   Explicit Peer Route Object-Type is 1 for IPv4 and 2 for IPv6

   The format of Explicit Peer Route object body for IPv4(Object-Type=1)
   is 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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Route Priority        |          Reserved               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                IPv4 Peer Address                              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |           Next Hop Address to the IPv4 Peer Address           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                      Additional TLVs                          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       Figure 8: Explicit Peer Route Object Body Format for IPv4

   The format of Explicit Peer Route object body for IPv6(Object-Type=2)
   is as follows:

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    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Route Priority        |           Reserved              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   +                                                               +
   |                      IPv6 Peer Address                        |
   +                                                               +
   |                                                               |
   +                                                               +
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   +                                                               +
   |          Next Hop Address to the IPv6 Peer Address            |
   +                                                               +
   |                                                               |
   +                                                               +
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Additional TLVs                              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       Figure 9: Explicit Peer Route Object Body Format for IPv6

   Route Priority: 2 Bytes, The priority of this explicit route.  The
   higher priority should be preferred by the device.  This field is
   used to indicate the backup path at each hop.

   Reserved.: is set to zero while sending, ignored on receipt.

   Peer Address: To indicate the peer address.

   Next Hop Address to the Peer: To indicate the next hop address to the
   corresponding peer.

   Additional TLVs: TLVs that associated with this object, can be used
   to convey other necessary information for explicit peer path
   establishment.  Its definition is out of the current document.

7.4.  Peer Prefix Association Object

   The Peer Prefix Association object is defined to specify the IP
   prefixes that should be advertised to the corresponding peer.  This
   object should only be included and sent to the head/end router of the
   end2end path.

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   The prefixes information included in this object MUST only be
   advertised to the indicated peer, MUST NOT be advertised to other BGP
   peers.

   Peer Prefix Association Object-Class is TBD16

   Peer Prefix Association Object-Type is 1 for IPv4 and 2 for IPv6

   The format of the Peer Prefix Association object body is 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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Peer IPv4 Address                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   //               IPv4 Prefix subobjects                         //
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Additional TLVs                              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     Figure 10: Peer Prefix Association Object Body Format for IPv4

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Peer IPv6 Address                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                                                               |
   //               IPv6 Prefix subobjects                         //
   |                                                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Additional TLVs                              |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      Figure 11: Peer Prefix Association Object Body Format for IPv6

   Peer IPv4 Address: 4 Bytes.  Identifies the peer IPv4 address that
   the associated prefixes will be sent to.

   IPv4 Prefix subojects: List of IPv4 Prefix subobjects that defined in
   [RFC3209], identify the prefixes that will be sent to the peer that
   identified by Peer IPv4 Address List.

   Peer IPv6 Address: 16 Bytes.  Identifies the peer IPv6 address that
   the associated prefixes will be sent to.

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   IPv6 Prefix subojects: List of IPv6 Prefix subobjects that defined in
   [RFC3209], identify the prefixes that will be sent to the peer that
   identified by Peer IPv6 Address List.

   Additional TLVs: TLVs that associated with this object, can be used
   to convey other necessary information for prefixes advertisement.
   Its definition is out of the current document.

8.  End to End Path Protection

   [RFC8697] defines the path associations procedures between sets of
   Label Switched Path (LSP).  Such procedures can also be used for the
   E2E path protection.  To accomplish this, the PCE should attach the
   ASSOCIATION object with the EPR object in the PCInitiate message,
   with the association type set to 1 (Path Protection Association).
   The Extended Association ID that included within the Extended
   Association ID TLV, which is included in the ASSOCIATION object,
   should be set to the Symbolic Path Name of different E2E path.  This
   PCinitiate should be sent to the head-end of the E2E path.

   The head-end of the path can use the existing path detection
   mechanism, to monitor the status of the active path.  Once it detects
   the failure, it can switch the backup protection path immediately.

9.  New Error-Types and Error-Values Defined

   A PCEP-ERROR object is used to report a PCEP error and is
   characterized by an Error-Type that specifies that type of error and
   an Error-value that provides additional information about the error.
   An additional Error-Type and several Error-values are defined to
   represent some the errors related to the newly defined objects, which
   are related to Native IP TE procedures.

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       +============+===============+==============================+
       | Error-Type | Meaning       | Error-value                  |
       +============+===============+=====================================+
       | TBD6       | Native IP     |                                     |
       |            | TE failure    |                                     |
       +------------+---------------+-------------------------------------+
       |            |               | 0: Unassigned                       |
       +------------+---------------+-------------------------------------+
       |            |               |TBD7: Peer AS not match              |
       +------------+---------------+-------------------------------------+
       |            |               |TBD8:Peer IP can't be reached        |
       +------------+---------------+-------------------------------------+
       |            |               |TBD9:Local IP is in use              |
       +------------+---------------+-------------------------------------+
       |            |               |TBD10:Remote IP is in use            |
       +------------+---------------+-------------------------------------+
       |            |               |TBD11:Exist BGP session broken       |
       +------------+---------------+-------------------------------------+
       |            |               |TBD12:Explicit Peer Route Error      |
       +------------+---------------+-------------------------------------+
       |            |               |TBD17:EPR/BPI Peer Info mismatch     |
       +------------+---------------+-------------------------------------+
       |            |               |TBD18:BPI/PPA Address Family mismatch|
       +------------+---------------+-------------------------------------+
       |            |               |TBD19:PPA/BPI Peer Info mismatch     |
       +------------+---------------+-------------------------------------+
       |            |               |                                     |
       +------------+---------------+-------------------------------------+
       |            |               |                                     |
       +------------+---------------+-------------------------------------+
       |            |               |                                     |
       +------------+---------------+-------------------------------------+
       |            |               |                                     |
       +------------+---------------+-------------------------------------+
            Figure 12: Newly defined Error-Type and Error-Value

10.  Deployment Considerations

   The information transferred in this draft is mainly used for the
   light weight BGP session setup, explicit route deployment and the
   prefix distribution.  The planning, allocation and distribution of
   the peer addresses within IGP should be accomplished in advanced and
   they are out of the scope of this draft.

   [RFC8232] describes the state synchronization procedure between
   stateful PCE and PCC.  The communication of PCE and PCC described in
   this draft should also follow this procedures, treat the three newly

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   defined objects that associated with the same symbolic path name as
   the attribute of the same path in the LSP-DB.

   When PCE detects one or some of the PCCs are out of control, it
   should recompute and redeploy the traffic engineering path for native
   IP on the active PCCs.  When PCC detects that it is out of control of
   the PCE, it should clear the information that initiated by the PCE.
   The PCE should assures the avoidance of possible transient loop in
   such node failure when it deploy the explicit peer route on the PCCs.

11.  Security Considerations

   Service provider should consider the protection of PCE and their
   communication with the underlay devices, which is described in
   document [RFC5440] and [RFC8253]

12.  IANA Considerations

12.1.  Path Setup Type Registry

   [RFC8408] created a sub-registry within the "Path Computation Element
   Protocol (PCEP) Numbers" registry called "PCEP Path Setup Types".
   IANA is requested to allocate a new code point within this registry,
   as follows:

   Value             Description                       Reference
   TBD1           Native IP TE Path                  This document

12.2.  PCECC-CAPABILITY sub-TLV's Flag field

   [I-D.ietf-pce-pcep-extension-for-pce-controller] created a sub-
   registry within the "Path Computation Element Protocol (PCEP)
   Numbers" registry to manage the value of the PCECC-CAPABILITY sub-
   TLV's 32-bits Flag field.  IANA is requested to allocate a new bit
   position within this registry, as follows:

   Value             Description                       Reference
   TBD2(N)        NATIVE-IP-TE-CAPABILITY           This document

12.3.  PCEP Object Types

   IANA is requested to allocate new registry for the PCEP Object Type:

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   Object-Class Value       Name                        Reference
   TBD13             CCI Object                      This document
                     Object-Type
                        TBD: Native IP

   TBD14             BGP Peer Info                   This document
                     Object-Type
                        1: IPv4 address
                        2: IPv6 address

   TBD15             Explicit Peer Route             This document
                     Object-Type
                        1: IPv4 address
                        2: IPv6 address

   TBD16             Peer Prefix Association         This document
                     Object-Type
                        1: IPv4 address
                        2: IPv6 address

12.4.  PCEP-Error Object

   IANA is requested to allocate new error types and error values within
   the "PCEP-ERROR Object Error Types and Values" sub-registry of the
   PCEP Numbers registry for the following errors::

Error-Type       Meaning                      Error-value                                                             Reference
6           Mandatory Object missing
                                      TBD4:Native IP object missing                                                This document

10          Reception of an invalid object
                                      TBD3:PCECC NATIVE-IP-TE-CAPABILITY bit is not set                            This document

19          Invalid Operation
                                      TBD5:Only one of the BPI,EPR or PPA object can be included in this message   This document

TBD6        Native IP TE failure                                                                                   This document
                                      TBD7:Peer AS not match
                                      TBD8:Peer IP can't be reached
                                      TBD9:Local IP is in use
                                      TBD10:Remote IP is in use
                                      TBD11:Exist BGP session broken
                                      TBD12:Explicit Peer Route Error
                                      TBD17:EPR/BPI Peer Info mismatch
                                      TBD18:BPI/PPA Address Family mismatch
                                      TBD19:PPA/BPI Peer Info mismatch

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13.  Contributor

   Dhruv Dhody has contributed the contents of this draft.

14.  Acknowledgement

   Thanks Mike Koldychev, Siva Sivabalan, Adam Simpson for his valuable
   suggestions and comments.

15.  Normative References

   [I-D.ietf-pce-pcep-extension-for-pce-controller]
              Li, Z., Peng, S., Negi, M., Zhao, Q., and C. Zhou, "PCEP
              Procedures and Protocol Extensions for Using PCE as a
              Central Controller (PCECC) of LSPs", draft-ietf-pce-pcep-
              extension-for-pce-controller-10 (work in progress),
              January 2021.

   [I-D.ietf-teas-pce-native-ip]
              Wang, A., Khasanov, B., Zhao, Q., and H. Chen, "Path
              Computation Element (PCE) based Traffic Engineering (TE)
              in Native IP Networks", draft-ietf-teas-pce-native-ip-16
              (work in progress), January 2021.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [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,
              <https://www.rfc-editor.org/info/rfc3209>.

   [RFC5440]  Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation
              Element (PCE) Communication Protocol (PCEP)", RFC 5440,
              DOI 10.17487/RFC5440, March 2009,
              <https://www.rfc-editor.org/info/rfc5440>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8231]  Crabbe, E., Minei, I., Medved, J., and R. Varga, "Path
              Computation Element Communication Protocol (PCEP)
              Extensions for Stateful PCE", RFC 8231,
              DOI 10.17487/RFC8231, September 2017,
              <https://www.rfc-editor.org/info/rfc8231>.

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   [RFC8232]  Crabbe, E., Minei, I., Medved, J., Varga, R., Zhang, X.,
              and D. Dhody, "Optimizations of Label Switched Path State
              Synchronization Procedures for a Stateful PCE", RFC 8232,
              DOI 10.17487/RFC8232, September 2017,
              <https://www.rfc-editor.org/info/rfc8232>.

   [RFC8253]  Lopez, D., Gonzalez de Dios, O., Wu, Q., and D. Dhody,
              "PCEPS: Usage of TLS to Provide a Secure Transport for the
              Path Computation Element Communication Protocol (PCEP)",
              RFC 8253, DOI 10.17487/RFC8253, October 2017,
              <https://www.rfc-editor.org/info/rfc8253>.

   [RFC8281]  Crabbe, E., Minei, I., Sivabalan, S., and R. Varga, "Path
              Computation Element Communication Protocol (PCEP)
              Extensions for PCE-Initiated LSP Setup in a Stateful PCE
              Model", RFC 8281, DOI 10.17487/RFC8281, December 2017,
              <https://www.rfc-editor.org/info/rfc8281>.

   [RFC8283]  Farrel, A., Ed., Zhao, Q., Ed., Li, Z., and C. Zhou, "An
              Architecture for Use of PCE and the PCE Communication
              Protocol (PCEP) in a Network with Central Control",
              RFC 8283, DOI 10.17487/RFC8283, December 2017,
              <https://www.rfc-editor.org/info/rfc8283>.

   [RFC8408]  Sivabalan, S., Tantsura, J., Minei, I., Varga, R., and J.
              Hardwick, "Conveying Path Setup Type in PCE Communication
              Protocol (PCEP) Messages", RFC 8408, DOI 10.17487/RFC8408,
              July 2018, <https://www.rfc-editor.org/info/rfc8408>.

   [RFC8697]  Minei, I., Crabbe, E., Sivabalan, S., Ananthakrishnan, H.,
              Dhody, D., and Y. Tanaka, "Path Computation Element
              Communication Protocol (PCEP) Extensions for Establishing
              Relationships between Sets of Label Switched Paths
              (LSPs)", RFC 8697, DOI 10.17487/RFC8697, January 2020,
              <https://www.rfc-editor.org/info/rfc8697>.

   [RFC8735]  Wang, A., Huang, X., Kou, C., Li, Z., and P. Mi,
              "Scenarios and Simulation Results of PCE in a Native IP
              Network", RFC 8735, DOI 10.17487/RFC8735, February 2020,
              <https://www.rfc-editor.org/info/rfc8735>.

Authors' Addresses

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   Aijun Wang
   China Telecom
   Beiqijia Town, Changping District
   Beijing, Beijing  102209
   China

   Email: wangaj3@chinatelecom.cn

   Boris Khasanov
   Yandex LLC
   Ulitsa Lva Tolstogo 16
   Moscow
   Russia

   Email: bhassanov@yahoo.com

   Sheng Fang
   Huawei Technologies,Co.,Ltd
   Huawei Bld., No.156 Beiqing Rd.
   Beijing
   China

   Email: fsheng@huawei.com

   Ren Tan
   Huawei Technologies,Co.,Ltd
   Huawei Bld., No.156 Beiqing Rd.
   Beijing
   China

   Email: tanren@huawei.com

   Chun Zhu
   ZTE Corporation
   50 Software Avenue, Yuhua District
   Nanjing, Jiangsu  210012
   China

   Email: zhu.chun1@zte.com.cn

Wang, et al.             Expires August 9, 2021                [Page 26]