Network Working Group T. Zhou Internet-Draft Huawei Intended status: Standards Track F. Xu Expires: 17 February 2023 Tencent S. Zhuang H. Wang Huawei 16 August 2022 Real-Time Monitoring Link/Protocol Neighbor State draft-zhou-grow-monitoring-neighbor-state-00 Abstract Various protocols are deployed in today's networks, such as BGP / ISIS / OSPF etc. Link neighbor state changes and protocol neighbor state changes are the most important network events that need to be processed with the highest priority. In particular, the SDN controller needs to quickly sense the link neighbor and protocol neighbor state change information in the network. Thus, the various policies applied by the SDN controller to the network can quickly match the current state of the network. This document discusses some possible scenarios and the relevant requirements. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 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 17 February 2023. Zhou, et al. Expires 17 February 2023 [Page 1] Internet-Draft Monitoring Neighbor State August 2022 Copyright Notice Copyright (c) 2022 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 Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Requirements and Options . . . . . . . . . . . . . . . . . . 3 3. Neighbor State Information Format . . . . . . . . . . . . . . 4 4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4 5. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 5 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5 7. Security Considerations . . . . . . . . . . . . . . . . . . . 5 8. Normative References . . . . . . . . . . . . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5 1. Introduction Various protocols are deployed in today's networks, such as BGP / ISIS / OSPF / LDP / BFD etc. When managing a network, one of the most important things to monitor is changes to the various protocols' neighbor states. Many times a protocol neighbor state change is indicative of a problem on the network, and it is an important basis for the SND controller to deploy the traffic steering policies. There are several ways to monitor these state changes, e.g. we can use command-line interface (CLI) to get them from the devices, but typically it's done with either SNMP based polling and/or SNMP traps. For BGP, we can use BMP (BGP Monitoring Protocol) [RFC7854] to collect BGP neighbor state change information. Link neighbor state changes and protocol neighbor state changes are the most important network events that need to be processed with the highest priority. In particular, the SDN controller needs to quickly sense the link neighbor and protocol neighbor state change information in the network. Thus, the various policies applied by the SDN controller to the network can quickly match the current state of the network. Zhou, et al. Expires 17 February 2023 [Page 2] Internet-Draft Monitoring Neighbor State August 2022 The problem of the current real-time data collection method: Collecting protocol neighbor state will also collect many other large amounts of information data associated with it and have a significant impact on the reception/processing of high priority protocol neighbor state data. E.g., the processing of the BMP Peer Up/Down message is not real-time, and is affected by the receiving and processing of other BMP messages, especially a large number of route monitoring messages. At present, the SDN controller uses a single channel to receive real- time data from the network, and then classifies the data and processes it in order, which causes the delay of the neighbor state information processing to grow; and the neighbor information data structure of different protocols are different; these cases will increase the delay in which the SDN controller processes neighbor state data. 2. Requirements and Options Summary of requirements are as follows: Requirement 1: Network event prioritization, Set Link neighbor state changes and protocol neighbor state changes as the most important network events. Requirement 2: The structure of the link neighbor and protocol neighbor state change information needs to use a normalized format, such as a unified TLV. Requirement 3: Link Neighbor and Protocol Neighbor State Change Information requires a separate transport channel to be separated from other low priority data. Requirement 4: SDN controller implements the convergence mechanism of the existing network protocol in milliseconds/second. Some options to be discussed: 1) A new Neighbor State Monitoring Protocol. 2) Consider processing all neighbor states into LS information, flooding them through IGP, and collecting them on the controller through BGP-LS. 3) Consider processing all neighbor states into LS information, imorting them to the BGP-LS Local-RIB, and collecting them on the controller through BMP. Zhou, et al. Expires 17 February 2023 [Page 3] Internet-Draft Monitoring Neighbor State August 2022 4) gRPC + YANG Model. 5) To be added... 3. Neighbor State Information Format At present, the neighbor information data structure of different protocols are different. In order to speed up processing in controller or collector, this document proposes to use a normalized format as following: +---------------------------------------+ | Protocol Type | +---------------------------------------+ | Node-IP Address | +---------------------------------------+ | Local-IP Address | +---------------------------------------+ | Peer-IP Address | +---------------------------------------+ | Neighbor State | +---------------------------------------+ | Timestamp | +---------------------------------------+ Figure 1 Link Neighbor/Protocol Neighbor State Information Format Where: Protocol Type: 1: ISIS / 2: OSPF / 3: BGP / 4: LDP / 5: BFD etc. Node-IP Address: The IP Address of the monitored node, usually the router ID. Local-IP Address: Local-IP Address of the Neighbor Peer-IP Address: Peer-IP Address of the Neighbor Neighbor State: The state of the Neighbor Timestamp: The timestamp of the moment of the event 4. Acknowledgements The authors would like to thank Robin Li, Zhongjia Wang for their contributions to this work. Zhou, et al. Expires 17 February 2023 [Page 4] Internet-Draft Monitoring Neighbor State August 2022 5. Contributors Mach Chen mach.chen@huawei.com Yunan Gu guyunan@huawei.com 6. IANA Considerations TBD. 7. Security Considerations TBD. 8. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [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, . [RFC5492] Scudder, J. and R. Chandra, "Capabilities Advertisement with BGP-4", RFC 5492, DOI 10.17487/RFC5492, February 2009, . [RFC7854] Scudder, J., Ed., Fernando, R., and S. Stuart, "BGP Monitoring Protocol (BMP)", RFC 7854, DOI 10.17487/RFC7854, June 2016, . Authors' Addresses Tianran Zhou Huawei Huawei Bld., No.156 Beiqing Rd. Beijing 100095 China Email: zhoutianran@huawei.com Zhou, et al. Expires 17 February 2023 [Page 5] Internet-Draft Monitoring Neighbor State August 2022 Feng Xu Tencent Guangzhou China Email: oliverxu@tencent.com Shunwan Zhuang Huawei Huawei Bld., No.156 Beiqing Rd. Beijing 100095 China Email: zhuangshunwan@huawei.com Haibo Wang Huawei 156 Beiqing Road Beijing 100095 China Email: rainsword.wang@huawei.com Zhou, et al. Expires 17 February 2023 [Page 6]