PCE Working Group A. Wang Internet-Draft China Telecom Intended status: Standards Track B. Khasanov Expires: December 9, 2021 Yandex LLC S. Fang R. Tan Huawei Technologies,Co.,Ltd C. Zhu ZTE Corporation June 7, 2021 PCEP Extension for Native IP Network draft-ietf-pce-pcep-extension-native-ip-14 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 [RFC8821]. 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 December 9, 2021. Copyright Notice Copyright (c) 2021 IETF Trust and the persons identified as the document authors. All rights reserved. Wang, et al. Expires December 9, 2021 [Page 1] Internet-Draft PCEP Extension for Native IP Network June 2021 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 Advertisement Object . . . . . . . . . . . . 19 8. End to End Path Protection . . . . . . . . . . . . . . . . . 21 9. Re-Delegation and Clean up . . . . . . . . . . . . . . . . . 21 10. BGP Considerations . . . . . . . . . . . . . . . . . . . . . 21 11. New Error-Types and Error-Values Defined . . . . . . . . . . 22 12. Deployment Considerations . . . . . . . . . . . . . . . . . . 22 13. Security Considerations . . . . . . . . . . . . . . . . . . . 23 14. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 23 14.1. Path Setup Type Registry . . . . . . . . . . . . . . . . 23 14.2. PCECC-CAPABILITY sub-TLV's Flag field . . . . . . . . . 24 14.3. PCEP Object Types . . . . . . . . . . . . . . . . . . . 24 14.4. PCEP-Error Object . . . . . . . . . . . . . . . . . . . 24 15. Contributor . . . . . . . . . . . . . . . . . . . . . . . . . 25 16. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 25 17. Normative References . . . . . . . . . . . . . . . . . . . . 25 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 27 Wang, et al. Expires December 9, 2021 [Page 2] Internet-Draft PCEP Extension for Native IP Network June 2021 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. In Segment Routing either IGP extensions or BGP are used to steer a packet through an SR Policy instantiated as an ordered list of instructions called "segments". 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. [RFC8821] 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 advertisement 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 Advertisement o QoS: Quality of Service Wang, et al. Expires December 9, 2021 [Page 3] Internet-Draft PCEP Extension for Native IP Network June 2021 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 [RFC8821]. 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 or cleanup central controller's instructions (CCIs). Wang, et al. Expires December 9, 2021 [Page 4] Internet-Draft PCEP Extension for Native IP Network June 2021 [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 Advertisement (PPA) Object) are defined in this document. Refer to (Section 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: ::= Where: is defined in [RFC5440] ::= [] ::= (| | ) ::= (| ((||) )) ::= [] Where: is as per [I-D.ietf-pce-pcep-extension-for-pce-controller]. and are as per [RFC8281]. The LSP and SRP objects are defined in [RFC8231]. Wang, et al. Expires December 9, 2021 [Page 5] Internet-Draft PCEP Extension for Native IP Network June 2021 When PCInitiate message is used create Native IP instructions, the SRP, LSP and CCI objects MUST be present. The error handling for missing SRP, LSP 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: Wang, et al. Expires December 9, 2021 [Page 6] Internet-Draft PCEP Extension for Native IP Network June 2021 ::= Where: ::= [] ::= (| ) ::= [] ::= [] (| ((||) )) Where: 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. Wang, et al. Expires December 9, 2021 [Page 7] Internet-Draft PCEP Extension for Native IP Network June 2021 The PCInitiate message should be sent to PCC which acts as BGP router and route reflector(RR). 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 and the corresponding SRP and CCI object included. 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: Wang, et al. Expires December 9, 2021 [Page 8] Internet-Draft PCEP Extension for Native IP Network June 2021 Table 1: Message Information +-------------------------------------------------------------+ | No.| Peers| Type | Message Key Parameters | +-------------------------------------------------------------+ |M1 |PCE/R1|PCInitiate|CC-ID=X1(Symbolic Path Name=Class A) | |M1-R| |PCRpt |BPI Object(Local_IP=R1_A,Peer_IP=R3_A)| +-------------------------------------------------------------+ |M2 |PCE/R3|PCInitiate|CC-ID=X2(Symbolic Path Name=Class A) | |M2-R| |PCRpt |BPI Object(Local_IP=R3_A,Peer_IP=R1_A)| +-------------------------------------------------------------+ |M3 |PCE/R3|PCInitiate|CC-ID=X3(Symbolic Path Name=Class A) | |M3-R| |PCRpt |BPI Object(Local_IP=R3_A,Peer_IP=R7_A)| +-------------------------------------------------------------+ |M4 |PCE/R7|PCInitiate|CC-ID=X4(Symbolic Path Name=Class A) | |M4-R| |PCRpt |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 11 If the Local IP Address or Peer IP Address 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). 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. 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 and the corresponding SRP and CCI object included. Wang, et al. Expires December 9, 2021 [Page 9] Internet-Draft PCEP Extension for Native IP Network June 2021 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: Table 2: Message Information +------------------------------------------------------------------+ | No.|Peers | Type | Message Key Parameters | +------------------------------------------------------------------+ |M1 |PCE/R1|PCInitiate|CC-ID=X1(Symbolic Path Name=Class A) | |M1-R| |PCRpt |EPR Object(Peer Address=R7_A,Next Hop=R2_A)| +------------------------------------------------------------------+ |M2 |PCE/R2|PCInitiate|CC-ID=X2(Symbolic Path Name=Class A) | |M2-R| |PCRpt |EPR Object(Peer Address=R7_A,Next Hop=R4_A)| +------------------------------------------------------------------+ |M3 |PCE/R4|PCInitiate|CC-ID=X3(Symbolic Path Name=Class A) | |M3-R| |PCRpt |EPR Object(Peer Address=R7_A,Next Hop=R7_A)| +------------------------------------------------------------------+ Wang, et al. Expires December 9, 2021 [Page 10] Internet-Draft PCEP Extension for Native IP Network June 2021 +------------------+ + 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: Table 3: Message Information +------------------------------------------------------------------+ |No. |Peers | Type | Message Key Parameters | +------------------------------------------------------------------+ |M1 |PCE/R7|PCInitiate|CC-ID=X1(Symbolic Path Name=Class A) | |M1-R| |PCRpt |EPR Object(Peer Address=R1_A,Next Hop=R4_A)| +------------------------------------------------------------------+ |M2 |PCE/R4|PCInitiate|CC-ID=X2(Symbolic Path Name=Class A) | |M2-R| |PCRpt |EPR Object(Peer Address=R1_A,Next Hop=R2_A)| +------------------------------------------------------------------+ |M3 |PCE/R2|PCInitiate|CC-ID=X3(Symbolic Path Name=Class A) | |M3-R| |PCRpt |EPR Object(Peer Address=R1_A,Next Hop=R1_A)| +------------------------------------------------------------------+ In order to avoid the transient loop during the deploy of explicit peer route, the EPR object should be sent to the PCCs in the reverse order of the E2E path. To remove the explicit peer route, the EPR object should be sent to the PCCs in the same order of E2E path. 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 11. When the peer info is not the same as the peer info that indicated in BPI object in PCC for the same path that is identified by Symbolic Wang, et al. Expires December 9, 2021 [Page 11] Internet-Draft PCEP Extension for Native IP Network June 2021 Path Name TLV, 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 are 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 and the corresponding SRP and CCI object included. 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. 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 is not the same as the peer info that indicated in BPI object in PCC for the same path that is identified by Symbolic Path Name TLV, an error (Error-type=TBD6, Error-value=TBD19, PPA/BPI peer info mismatch) should be reported via the PCErr message. Wang, et al. Expires December 9, 2021 [Page 12] Internet-Draft PCEP Extension for Native IP Network June 2021 +------------------+ +----------+ 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 +-----------------------------------------------------------+ |No. | Peers| Type | Message Key Parameters | +-----------------------------------------------------------+ |M1 |PCE/R1|PCInitiate|CC-ID=X1(Symbolic Path Name=Class A)| |M1-R| |PCRpt |PPA Object(Peer IP=R7_A,Prefix=1_A) | +-----------------------------------------------------------+ |M2 |PCE/R7|PCInitiate|CC-ID=X2(Symbolic Path Name=Class A)| |M2-R| |PCRpt |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. CCI Object-Type is TBD13 for Native-IP as below Wang, et al. Expires December 9, 2021 [Page 13] Internet-Draft PCEP Extension for Native IP Network June 2021 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 sessions that established by manual or non PCE initiated configuration. BGP Peer Info Object-Class is TBD14 Wang, et al. Expires December 9, 2021 [Page 14] Internet-Draft PCEP Extension for Native IP Network June 2021 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 |T| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Local IP Address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Peer IP Address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Tunnel Source IP Address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Tunnel Destination 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: Wang, et al. Expires December 9, 2021 [Page 15] Internet-Draft PCEP Extension for Native IP Network June 2021 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 |T| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | Local IP Address (16 bytes) | + + | | + + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | Peer IP Address (16 bytes) | + + | | + + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | Tunnel Source IP Address (16 bytes) | + + | | + + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | Tunnel Destination 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. Wang, et al. Expires December 9, 2021 [Page 16] Internet-Draft PCEP Extension for Native IP Network June 2021 Reserved: is set to zero while sending, ignored on receipt. T bit: Indicates whether the traffic that associated with the prefixes advertised via this BGP session is transported via IPinIP tunnel (when T bit is set) or not (when T bit is clear). 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; Tunnel Source IP Address(4/16 Bytes): IP address of the tunnel source, should be owned by the local router. When Object-Type is 1, length is 4 bytes; when Object-Type is 2, length is 16 bytes. Tunnel Destination IP Address(4/16 Bytes): IP address of the tunnel destination, should be owned by the peer router. When Object-Type is 1, length is 4 bytes; when Object-Type is 2, length is 16 bytes. Should be different from the Peer IP Address. Additional TLVs: TLVs that associated with this object, can be used to convey other necessary information for dynamic BGP session establishment. Their definition are 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 than the static route configured by manual or NETCONF or by other means. Explicit Peer Route Object-Class is TBD15. Wang, et al. Expires December 9, 2021 [Page 17] Internet-Draft PCEP Extension for Native IP Network June 2021 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 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Peer/Tunnel Destination Address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Next Hop Address to the Peer/Tunnel Destination 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: 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 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | Peer Address/Tunnel Destination Address | + + | | + + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + + | Next Hop Address to the Peer/Tunnel Destination Address | + + | | + + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Additional TLVs | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 9: Explicit Peer Route Object Body Format for IPv6 Wang, et al. Expires December 9, 2021 [Page 18] Internet-Draft PCEP Extension for Native IP Network June 2021 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/Tunnel Destination Address: To indicate the peer address(4/16 Bytes). When T bit is set in the associated BPI object, use the tunnel destination address in BPI object; when T bit is clear, use the peer address in BPI object. Next Hop Address to the Peer/Tunnel Destination Address: To indicate the next hop address(4/16 Bytes) to the corresponding peer/tunnel destination address. 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 Advertisement Object The Peer Prefix Advertisement 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. 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 Advertisement Object-Class is TBD16 Peer Prefix Advertisement Object-Type is 1 for IPv4 and 2 for IPv6 The format of the Peer Prefix Advertisement object body is as follows: Wang, et al. Expires December 9, 2021 [Page 19] Internet-Draft PCEP Extension for Native IP Network June 2021 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 Advertisement 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 Advertisement 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. 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. Wang, et al. Expires December 9, 2021 [Page 20] Internet-Draft PCEP Extension for Native IP Network June 2021 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. Re-Delegation and Clean up In case of a PCE failure, a new PCE can gain control over the central controller instructions. As per the PCEP procedures in [RFC8281], the State Timeout Interval timer is used to ensure that a PCE failure does not result in automatic and immediate disruption for the services. Similarly, as per [I-D.ietf-pce-pcep-extension-for-pce-controller], the central controller instructions are not removed immediately upon PCE failure. Instead, they could be re-delegated to the new PCE before the expiration of this timer, or be cleaned up on the expiration of this timer. The allows for network clean up without manual intervention. The PCC MUST support the removal of CCI as one of the behaviors applied on expiration of the State Timeout Interval timer. 10. BGP Considerations This draft defines the procedures and objects to create the BGP sessions and advertises the associated prefixes dynamically. Only the key information, for example peer IP addresses, peer AS number are exchanged via the PCEP protocol. Other parameters that are needed for the BGP session setup should be derived from their default values, as described in Section 7.2. Upon receives such key information, the BGP module on the PCC should try to accomplish the task that appointed by the PCEP protocol and report the status to the PCEP modules. There is no influence to current implementation of BGP Finite State Machine(FSM). The PCEP cares only the success and failure status of BGP session, and act upon such information accordingly. Wang, et al. Expires December 9, 2021 [Page 21] Internet-Draft PCEP Extension for Native IP Network June 2021 The error handling procedures related to incorrect BGP parameters are specified in Section 6.1, Section 6.2, and Section 6.3. The handling of the dynamic BGP sessions and associated prefixes on PCE failure is described in Section 9. 11. 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. +============+===============+==============================+ | 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 12. 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 Wang, et al. Expires December 9, 2021 [Page 22] Internet-Draft PCEP Extension for Native IP Network June 2021 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 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. 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 clear the prefixes advertisement on the previous BGP session, clear the explicit peer route to the previous peer address; select other Local_IP/Peer_IP pair to establish the new BGP session, deploy the explicit peer route to the new peer address, and advertises the prefixes on the new BGP session. 13. Security Considerations The setup of BGP sessions, prefix advertisement, and explicit peer route establishment are all controlled by the PCE. See [RFC4271] and [RFC4272] for BGP security considerations. Security consideration part in [RFC5440] and [RFC8231] should be considered. To prevent a bogus PCE sending harmful messages to the network nodes, the network devices should authenticate the validity of the PCE and ensure a secure communication channel between them. Mechanisms described in [RFC8253] should be used. 14. IANA Considerations 14.1. 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 Wang, et al. Expires December 9, 2021 [Page 23] Internet-Draft PCEP Extension for Native IP Network June 2021 14.2. 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 14.3. PCEP Object Types IANA is requested to allocate new registry for the PCEP Object Type: Object-Class Value Name Reference 44 CCI Object This document Object-Type TBD13: 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 Advertisement This document Object-Type 1: IPv4 address 2: IPv6 address 14.4. 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:: Wang, et al. Expires December 9, 2021 [Page 24] Internet-Draft PCEP Extension for Native IP Network June 2021 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 15. Contributor Dhruv Dhody has contributed the contents of this draft. 16. Acknowledgement Thanks Mike Koldychev, Siva Sivabalan, Adam Simpson for his valuable suggestions and comments. 17. Normative References [I-D.ietf-pce-pcep-extension-for-pce-controller] Li, Z., Peng, S., Negi, M. S., 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-14 (work in progress), March 2021. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [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, . Wang, et al. Expires December 9, 2021 [Page 25] Internet-Draft PCEP Extension for Native IP Network June 2021 [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A Border Gateway Protocol 4 (BGP-4)", RFC 4271, DOI 10.17487/RFC4271, January 2006, . [RFC4272] Murphy, S., "BGP Security Vulnerabilities Analysis", RFC 4272, DOI 10.17487/RFC4272, January 2006, . [RFC5440] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation Element (PCE) Communication Protocol (PCEP)", RFC 5440, DOI 10.17487/RFC5440, March 2009, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [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, . [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, . [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, . [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, . [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, . Wang, et al. Expires December 9, 2021 [Page 26] Internet-Draft PCEP Extension for Native IP Network June 2021 [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, . [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, . [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, . [RFC8821] Wang, A., Khasanov, B., Zhao, Q., and H. Chen, "PCE-Based Traffic Engineering (TE) in Native IP Networks", RFC 8821, DOI 10.17487/RFC8821, April 2021, . Authors' Addresses 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 Wang, et al. Expires December 9, 2021 [Page 27] Internet-Draft PCEP Extension for Native IP Network June 2021 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 December 9, 2021 [Page 28]