PCE Working Group A. Wang Internet-Draft China Telecom Intended status: Standards Track B. Khasanov Expires: August 21, 2020 S. Fang Huawei C. Zhu ZTE Corporation February 18, 2020 PCEP Extension for Native IP Network draft-ietf-pce-pcep-extension-native-ip-05 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 [I-D.ietf-teas-native-ip-scenarios] 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 21, 2020. Copyright Notice Copyright (c) 2020 IETF Trust and the persons identified as the document authors. All rights reserved. Wang, et al. Expires August 21, 2020 [Page 1] Internet-Draft PCEP Extension for Native IP Network February 2020 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 . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Conventions used in this document . . . . . . . . . . . . . . 3 3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. CCI Objects . . . . . . . . . . . . . . . . . . . . . . . . . 3 5. CCI Object associated TLV . . . . . . . . . . . . . . . . . . 4 5.1. Peer Address List TLV . . . . . . . . . . . . . . . . . . 4 5.2. Peer Prefix Association TLV . . . . . . . . . . . . . . . 6 5.2.1. Prefix sub TLV . . . . . . . . . . . . . . . . . . . 7 5.3. Explicit Peer Route TLV . . . . . . . . . . . . . . . . . 7 6. Management Consideration . . . . . . . . . . . . . . . . . . 8 7. Security Considerations . . . . . . . . . . . . . . . . . . . 8 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8 8.1. CCI Object Type . . . . . . . . . . . . . . . . . . . . . 9 8.2. CCI Object Associated TLV . . . . . . . . . . . . . . . . 9 9. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 9 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 9 10.1. Normative References . . . . . . . . . . . . . . . . . . 9 10.2. Informative References . . . . . . . . . . . . . . . . . 10 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10 1. Introduction Traditionally, Multiprotocol Label Switching Traffic Engineering (MPLS-TE) traffic assurance requires the corresponding network devices support Multiprotocol Label Switching (MPLS) or the complex Resource ReSerVation Protocol (RSVP)/Label Distribution Protocol (LDP) /Segment Routing etc. 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 Dual/Multi Border Gateway Protocol (BGP) solution. This draft describes the corresponding Path Computation Element Communication Protocol (PCEP) extensions to Wang, et al. Expires August 21, 2020 [Page 2] Internet-Draft PCEP Extension for Native IP Network February 2020 transfer the key information about peer address list, peer prefix association and the explicit peer route on on-path router. 2. Conventions used in this document The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 3. 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 CCI: Central Controller's Instructions o E2E: End to End o EPR: Explicit Peer Route o PAL: Peer Address List o PPA: Peer Prefix Association o QoS: Quality of Service 4. CCI Objects Draft [I-D.ietf-pce-pcep-extension-for-pce-controller] introduces the Central Controller's Instructions (CCI) object which is included in the PCInitiate and PCRpt message to transfer the centrally control instruction and status between Path Computation Element (PCE) and Path Computation Clients (PCC). This object is extended to include the construction for native IP solution. Additional Type-Length- Values (TLVs) are defined and included in this extended CCI object. CCI Object-Class is TBD, should be same as that defined in draft [I-D.ietf-pce-pcep-extension-for-pce-controller] CCI Object-Type is TBD for Native IP network Wang, et al. Expires August 21, 2020 [Page 3] Internet-Draft PCEP Extension for Native IP Network February 2020 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 1: CCI Object Format The fields in the CCI object are as follows: CC-ID: A PCEP-specific identifier for the CCI information. A PCE creates an CC-ID for each instruction, the value is unique within the scope of the PCE and is constant for the lifetime of a PCEP session. The values 0 and 0xFFFFFFFF are reserved and MUST NOT be used. Flags: Is used to carry any additional information pertaining to the CCI. Optional TLV: Additional TLVs that are associated with the Native IP construction. 5. CCI Object associated TLV Three new TLVs are defined in this draft: o PAL TLV: Peer Address List TLV, used to tell the network device which peer it should be peered with dynamically o PPA TLV: Peer Prefix Association TLV,used to tell which prefixes should be advertised via the corresponding peer o EPR TLV: Explicit Peer Route TLV,used to point out which route should be taken to arrive to the peer. 5.1. Peer Address List TLV The Peer Address List TLV is defined to specify the IP address of peer that the received network device should establish the BGP relationship with. This TLV 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. Wang, et al. Expires August 21, 2020 [Page 4] Internet-Draft PCEP Extension for Native IP Network February 2020 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type=TBD | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Peer Num | Resv. | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Peer ID | AT | Resv. | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Local AS Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Peer AS Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ETTL | Peer Cookie | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Local IP Address(4/16 Bytes) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Peer IP Address(4/16 Bytes) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Additional Peer Info. | // (From Peer ID to Peer IP Address) // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 2: Peer Address List TLV Format Type: 2 Bytes, value is TBD. Length: 2 Bytes, the length of the following fields. Peer Num : 2 Bytes, Peer Address Number on the advertised router. Peer-ID: 2 Bytes, to distinguish the different peer pair, will be referenced in Peer Prefix Association, if the PCE use multi-BGP solution for different QoS assurance requirement. AT: 1 Bytes, Address Type. To indicate the address type of Peer. Equal to 4, if the following IP address of peer is belong to IPv4; Equal to 6 if the following IP address of peer is belong to IPv6. Resv: 1 Bytes, Reserved for future use. Local AS Number: 4 Bytes, to indicate the AS number of the Local Peer. Peer AS Number: 4 Bytes, to indicate the AS number of Remote Peer. ETTL: 1 Bytes, 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 August 21, 2020 [Page 5] Internet-Draft PCEP Extension for Native IP Network February 2020 Peer Cookie: Used for establishing the secure BGP session between two peers. The PCEP client should use the MD5 algorithm to generate the encrypted message. Local IP Address(4/16 Bytes): IPv4 address of the local router, used to peer with other end router. When AT equal to 4, length is 32bit; when AT equal to 16, length is 128bit. Peer IP Address(4/16 Bytes): IPv4 address of the peer router, used to peer with the local router. When AT equal to 4, length is 32bit; IPv6 address of the peer when AT equal to 16, length is 128bit; 5.2. Peer Prefix Association TLV The Peer Prefix Association TLV is defined to specify the IP prefixes that should be advertised by the corresponding Peer. This TLV should only be included and sent to the head/end router of the end2end path in case there is no 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. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type=TBD | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Peer ID | Prefixes Num | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Peer Associated IP Prefix sub TLV(Variable) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 3: Peer Prefix Association TLV Format Type: 2 Bytes, value is TBD Length: 2 Bytes, the length of the following fields. Peer-ID: 2 Bytes, to indicate which peer should be used to advertise the following IP Prefix TLV. This value is assigned in the Peer Address List object and is referred in this object. Prefixes Num: 2 Bytes, number of prefixes that advertised by the corresponding Peer. It should be equal to number of the following IP prefix sub TLV. Peer Associated IP Prefix sub TLV: Variable Length, indicate the advertised IP Prefix. Wang, et al. Expires August 21, 2020 [Page 6] Internet-Draft PCEP Extension for Native IP Network February 2020 5.2.1. Prefix sub TLV Prefix sub TLV is used to carry the prefix information, which has the following format: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type=TBD | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | AT | Prefix Length | Prefix Value | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Prefix Value | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 4: Prefix sub TLV Format Type: 2 Bytes, value is TBD Length: 2 Bytes, the length of the following fields. AT: 1 Byte, Address Type. To indicate the address type of Peer. Equal to 4, if the following "Prefix address" belong to IPv4; Equal to 6 if the following "Prefix address" belong to IPv6. Prefix Length: 1 Byte, the prefix length. For example, for 10.0.0.0/8, this field will be equal to 8; for 2001:DB8::/32, this field will be equal to 32. Prefix Value: Variable length, the value of the prefix. For example, for 10.0.0.0/8, this field will be 10.0.0.0; for 2001:DB8::/32, this field will be equal to 2001:DB8::. 5.3. Explicit Peer Route TLV The Explicit Peer Route TLV is defined to specify the explicit peer route to the corresponding peer address on each device that is on the E2E assurance path. This TLV should be sent to all the devices that locates on the E2E assurance path that calculated by PCE. Wang, et al. Expires August 21, 2020 [Page 7] Internet-Draft PCEP Extension for Native IP Network February 2020 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type=TBD | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Route Priority| AT | Peer Address(IPv4/IPv6) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Next Hop Address to the Peer(IPv4/IPv6) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 5: Explicit Peer Route TLV Type: 2 Bytes, value is TBD Length: 2 Bytes, the length of following fields. Route Priority: 1 Byte, The priority of this explicit route. The higher priority should be preferred by the device. AT: 1 Byte, Address Type. To indicate the address type of explicit peer route. Equal to 4, if the following peer and next hop address belongs to IPv4; Equal to 6 if the following peer and next hop address belongs to IPv6. Peer Address: Variable Length, to indicate the peer address. Next Hop Address to the Peer: Variable Length, to indicate the next hop address to the corresponding peer that indicated by the Peer-ID. 6. Management Consideration The information transferred in this draft is mainly used for the light weight BGP session setup, the prefix distribution and the explicit route deployment. 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. 7. 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] 8. IANA Considerations Wang, et al. Expires August 21, 2020 [Page 8] Internet-Draft PCEP Extension for Native IP Network February 2020 8.1. CCI Object Type IANA is requested to allocate new registry for the CCI Object Type: Object-Type Value CCI Object Name Reference 3 Native IP This document 8.2. CCI Object Associated TLV IANA is requested to confirm the early allocation of the following TLV Type Indicator values within the "PCEP TLV Type Indicator" sub- registry of the PCEP Numbers registry, and to update the reference in the registry to point to this document, when it is an RFC: Value Meaning Reference --------------------------------------------------------- TBD Peer Address List TLV This document TBD Peer Prefix Association TLV This document TBD Explicit Peer Route TLV This document TBD Prefix sub TLV This document 9. Acknowledgement Thanks Dhruv Dhody for his valuable suggestions and comments. 10. References 10.1. Normative References [I-D.ietf-pce-pcep-extension-for-pce-controller] Zhao, Q., Li, Z., Negi, M., 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-03 (work in progress), November 2019. [I-D.ietf-teas-pce-native-ip] Wang, A., Zhao, Q., Khasanov, B., and H. Chen, "PCE in Native IP Network", draft-ietf-teas-pce-native-ip-05 (work in progress), January 2020. [RFC5440] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation Element (PCE) Communication Protocol (PCEP)", RFC 5440, DOI 10.17487/RFC5440, March 2009, . Wang, et al. Expires August 21, 2020 [Page 9] Internet-Draft PCEP Extension for Native IP Network February 2020 [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, . 10.2. Informative References [I-D.ietf-teas-native-ip-scenarios] Wang, A., Huang, X., Qou, C., Li, Z., and P. Mi, "Scenarios and Simulation Results of PCE in Native IP Network", draft-ietf-teas-native-ip-scenarios-12 (work in progress), October 2019. Authors' Addresses Aijun Wang China Telecom Beiqijia Town, Changping District Beijing, Beijing 102209 China Email: wangaj3@chinatelecom.cn Boris Khasanov Huawei Technologies,Co.,Ltd Moskovskiy Prospekt 97A St.Petersburg 196084 Russia Email: khasanov.boris@huawei.com Wang, et al. Expires August 21, 2020 [Page 10] Internet-Draft PCEP Extension for Native IP Network February 2020 Sheng Fang Huawei Technologies, Co., Ltd Huawei Bld., No.156 Beiqing Rd. Beijing China Email: fsheng@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 21, 2020 [Page 11]