YD/T 4473-2023
SDN-based IP RAN network information model and interface technical requirements (English Version)

Standard No.

YD/T 4473-2023

Language

Chinese, Available in English version

Release Date

2023

Published By

Professional Standard - Post and Telecommunication  CN  /  YD

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YD/T 4473-2023

Introduction

Analysis of the core content of the standard

The standard defines the three core elements of the SDN-based IPRAN network: network information model, interface technical specifications and typical business scenarios. The decoupling of the forwarding layer, control layer, and application layer is achieved through a layered architecture, including:

Architecture level	Functional module	Key interface
Forwarding layer	CSG/ASG and other network element devices	Southbound interface
Control layer	Network element controller + network orchestrator	Northbound dual interface
Application layer	Business APP/Operation and maintenance APP	Capability exposure API

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Key technical features

1. Hierarchical topology management

The standard adopts a two-layer modeling method of physical topology + logical abstraction:

• Node object: distinguishes between physical nodes (actual network elements) and container nodes (network domain abstraction)
• Link object: defines internal links (intra-domain) and external links (inter-domain)
• Supports optical/physical/datalink/ip multi-level topology presentation

2. Refined resource management

Typical case: In a certain operator's cross-domain dedicated line service, the NE resource object is used to achieve the following:

• Device longitude and latitude positioning (accuracy ±50 meters)
• Intelligent matching of software versions
• Real-time monitoring of UNI interface status

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Service Management Model

Service Type	Information Model	Key Parameters
L2VPN VPWS	Pw-trails Object	master/slave protection type
L3VPN	L3vpn Object	hub-spoke Topology Mode

QoS Guarantee Mechanism

Implemented through the Qos-policy Object:

• Bidirectional Traffic Shaping (CIR/PIR Parameters)
• Differentiated Scheduling Based on AC Interface
• BFD detection interval ≤ 50ms

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Implementation suggestions

1. Phase-based deployment: It is recommended to first pilot SDN within a single vendor domain, and then expand to cross-domain scenarios
2. Interface compatibility: It is necessary to ensure that the northbound interface supports RSVP-TE/SR-TE multi-protocol stack
3. Operation and maintenance transformation: It is recommended to build an intelligent early warning system based on performance management objects

YD/T 4473-2023 history

• 2023 YD/T 4473-2023 SDN-based IP RAN network information model and interface technical requirements

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