anima M. Han, Ed. Internet-Draft J. Zhao, Ed. Intended status: Standards Track Z. Ruan, Ed. Expires: 23 April 2026 S. Zhang, Ed. China Unicom 20 October 2025 Automatic Network Congestion Relief in GeneRic Autonomic Signaling Protocol (GRASP) draft-han-anima-grasp-congestion-relief-00 Abstract This draft defines a method for automatic congestion relief using the Grasp protocol. In operator networks, in response to network failures such as fiber optic cable faults and optical module malfunctions, network devices can automatically respond and achieve real-time self-healing, thereby ensuring the stable operation of the network. 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 23 April 2026. Copyright Notice Copyright (c) 2025 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 Han, et al. Expires 23 April 2026 [Page 1] Internet-Draft Automatic Network Congestion Relief in G October 2025 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 1.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Conventions and Definitions . . . . . . . . . . . . . . . . . 3 3. Approach of Automatic Network Congestion Relief . . . . . . . 3 4. GRASP Requirements and Specification . . . . . . . . . . . . 3 4.1. GRASP Requirements . . . . . . . . . . . . . . . . . . . 3 4.1.1. New GRASP Option: Congestion Monitoring . . . . . . . 4 4.1.2. New GRASP Option: Bandwidth Allocation . . . . . . . 4 4.1.3. ASA capability: Autonomous Decision for Congestion Relief . . . . . . . . . . . . . . . . . . . . . . . 4 4.2. GRASP Specification . . . . . . . . . . . . . . . . . . . 4 5. Security Considerations . . . . . . . . . . . . . . . . . . . 4 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 7.1. Normative References . . . . . . . . . . . . . . . . . . 4 7.2. Informative References . . . . . . . . . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5 1. Introduction 1.1. Overview GeneRic Autonomic Signaling Protocol (GRASP) [RFC8990] is intended to be used for Service Announcement, Discovery and Selection especially in network or for network services intended to be deployable without dependencies against centralized "server" entities, such as fully autonomous networks or Autonomous Service Agents (ASA). To support these goals, GRASP provides a hop-by-hop network wide flooding of announcement or discover messages reliably and secured and without looping messages. This flooding is achieved with a per- hop GRASP agent responsible for per-hop flooding of GRASP messages. Automatic Network Congestion Relief is introduced by [I-D.zhao-anima-automatic-congestion-relief]. The ntwork congestion caused by fiber optic failures becoming a common issue for operators. It requires dedicated staff to perform daily traffic inspections and manually adjust configurations on an hourly basis, which significantly increases the difficulty of network maintenance. Han, et al. Expires 23 April 2026 [Page 2] Internet-Draft Automatic Network Congestion Relief in G October 2025 This draft introduces an automatic congestion relief mechanism based on intelligent traffic analysis and auto-regulation. In the event of congestion caused by fiber optic failures, it can intelligently respond to congestion and initiate real-time self-healing processes, solving the network congestion and maintenance challenges faced by operators due to fiber optic failures, and ensuring the stable operation of the network. The mechanism in this document enables the Automatic Network Congestion Relief through GRASP. 2. Conventions and Definitions 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. Approach of Automatic Network Congestion Relief This second-level congestion relief mechanism is automated through the intelligent module within the device. Leveraging intelligent traffic analysis, it precisely calculates the volume of traffic requiring redistribution. Subsequently, it redirects this traffic to paired devices via inter-device protocol announcements and the automatic adjustment of routing priorities. +-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Traffic Modeling |------>| Traffic Monitoring |---->| Intelligent policy generation | +-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | +-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Policy Reversion |<----| Policy Regulation | +-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 1: Mechanism Framework Description 4. GRASP Requirements and Specification This sections describes how to utilize GRASP protocol to realize the autonomic congestion relief mechanism. 4.1. GRASP Requirements Han, et al. Expires 23 April 2026 [Page 3] Internet-Draft Automatic Network Congestion Relief in G October 2025 4.1.1. New GRASP Option: Congestion Monitoring A new Option is defined within the GRASP protocol to carry congestion status information transmitted between Autonomous Service Agent (ASA) nodes. As an example, a node MAY periodically transmit messages that include its local congestion metrics, such as queue length and bandwidth utilization to adjacent nodes. 4.1.2. New GRASP Option: Bandwidth Allocation Leveraging the negotiation mechanism inherent to the GRASP protocol, network nodes are able to negotiate the allocation of bandwidth resources. Upon the occurrence of network congestion, nodes SHALL renegotiate the bandwidth allocation scheme, reduce the bandwidth consumption of non-critical traffic flows, and release additional resources to be allocated to critical traffic flows. 4.1.3. ASA capability: Autonomous Decision for Congestion Relief Nodes independently determine whether to trigger the congestion relief mechanism based on the congestion status they locally monitor and the congestion information received from peer nodes. For instance, if a node's queue length or bandwidth utilization exceeds a predefined threshold, the congestion resolution process is automatically initiated. By leveraging the distributed nature of the GRASP protocol, all nodes within the network are enabled to participate in the congestion resolution decision-making process. Each node makes optimal decisions based on its local information and the global network information it obtains, thereby achieving end-to-end congestion resolution across the entire network. 4.2. GRASP Specification TBD. 5. Security Considerations TBD. 6. IANA Considerations TBD. 7. References 7.1. Normative References Han, et al. Expires 23 April 2026 [Page 4] Internet-Draft Automatic Network Congestion Relief in G October 2025 [RFC5305] Li, T. and H. Smit, "IS-IS Extensions for Traffic Engineering", RFC 5305, DOI 10.17487/RFC5305, October 2008, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . 7.2. Informative References [RFC8990] Bormann, C., Carpenter, B., Ed., and B. Liu, Ed., "GeneRic Autonomic Signaling Protocol (GRASP)", RFC 8990, DOI 10.17487/RFC8990, May 2021, . [I-D.zhao-anima-automatic-congestion-relief] Zhao, J. and S. Zhang, "Automatic Network Congestion Relief", Work in Progress, Internet-Draft, draft-zhao- anima-automatic-congestion-relief-00, 3 March 2025, . Authors' Addresses Mengyao Han (editor) China Unicom Beijing China Email: hanmy12@chinaunicom.cn Jing Zhao (editor) China Unicom Beijing China Email: zhaoj501@chinaunicom.cn Zheng Ruan (editor) China Unicom Beijing China Email: ruanz6@chinaunicom.cn Han, et al. Expires 23 April 2026 [Page 5] Internet-Draft Automatic Network Congestion Relief in G October 2025 Shuai Zhang (editor) China Unicom Beijing China Email: zhangs633@chinaunicom.cn Han, et al. Expires 23 April 2026 [Page 6]