rfc9418v2.txt		rfc9418.txt
	Internet Engineering Task Force (IETF) B. Claise		Internet Engineering Task Force (IETF) B. Claise
	Request for Comments: 9418 J. Quilbeuf		Request for Comments: 9418 J. Quilbeuf
	Category: Standards Track Huawei		Category: Standards Track Huawei
	ISSN: 2070-1721 P. Lucente		ISSN: 2070-1721 P. Lucente
	NTT		NTT
	P. Fasano		P. Fasano
	TIM S.p.A		TIM S.p.A
	T. Arumugam		T. Arumugam
	Cisco Systems, Inc.		Consultant
	June 2023		June 2023
	A YANG Data Model for Service Assurance		A YANG Data Model for Service Assurance
	Abstract		Abstract
	This document specifies YANG modules for representing assurance		This document specifies YANG modules for representing assurance
	graphs. These graphs represent the assurance of a given service by		graphs. These graphs represent the assurance of a given service by
	decomposing it into atomic assurance elements called subservices.		decomposing it into atomic assurance elements called subservices.
	The companion document, "Service Assurance for Intent-Based		The companion document, "Service Assurance for Intent-Based
	skipping to change at line 198 ¶		skipping to change at line 198 ¶
	* device: Whether a device is healthy, and if not, what are the		* device: Whether a device is healthy, and if not, what are the
	symptoms? Such a subservice might monitor the device resources,		symptoms? Such a subservice might monitor the device resources,
	such as CPU, RAM, or Ternary Content-Addressable Memory (TCAM).		such as CPU, RAM, or Ternary Content-Addressable Memory (TCAM).
	Potential symptoms are "CPU overloaded", "Out of RAM", or "Out of		Potential symptoms are "CPU overloaded", "Out of RAM", or "Out of
	TCAM".		TCAM".
	* ip-connectivity: Given two IP addresses bound to two devices, what		* ip-connectivity: Given two IP addresses bound to two devices, what
	is the quality of the IP connectivity between them? Potential		is the quality of the IP connectivity between them? Potential
	symptoms are "No route available" or "Equal-Cost Multipaths		symptoms are "No route available" or "Equal-Cost Multipaths
	(ECMPs) Imbalance".		(ECMPs) imbalance".
	An instance of the device subservice is representing a subpart of the		An instance of the device subservice is representing a subpart of the
	network system, namely a specific device. An instance of the ip-		network system, namely a specific device. An instance of the ip-
	connectivity subservice is representing a feature of the network,		connectivity subservice is representing a feature of the network,
	namely the connectivity between two specific IP addresses on two		namely the connectivity between two specific IP addresses on two
	devices. In both cases, these subservices might depend on other		devices. In both cases, these subservices might depend on other
	subservices, for instance, the connectivity might depend on a		subservices, for instance, the connectivity might depend on a
	subservice representing the routing system and on a subservice		subservice representing the routing system and on a subservice
	representing ECMPs.		representing ECMPs.
	skipping to change at line 1987 ¶		skipping to change at line 1987 ¶
	Email: paolo@ntt.net		Email: paolo@ntt.net
	Paolo Fasano		Paolo Fasano
	TIM S.p.A		TIM S.p.A
	via G. Reiss Romoli, 274		via G. Reiss Romoli, 274
	10148 Torino		10148 Torino
	Italy		Italy
	Email: paolo2.fasano@telecomitalia.it		Email: paolo2.fasano@telecomitalia.it
	Thangam Arumugam		Thangam Arumugam
	Cisco Systems, Inc.		Consultant
	Milpitas, California		Milpitas, California
	United States of America		United States of America
	Email: thangavelu@yahoo.com		Email: thangavelu@yahoo.com
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