In telecommunications, a network-to-network interface (NNI) is an interface that specifies signaling and management functions between two networks. An NNI circuit can be used for interconnection of signalling (e.g., SS7 ), Internet Protocol (IP) (e.g., MPLS ) or ATM networks.

Updates to the MPLS-TP UNI and NNI The Transport Service Interfaces for MPLS-TP are defined in Section 3.4.3 of [RFC5921]. These definitions are illustrated by showing MPLS-TP Provider Edges (PEs) containing a UNI and an NNI. The figures illustrate the UNI and the NNI as a span.

NNI就是设备之间的接口协议，根据设备不同，业务类型不同，NNI接口的具体内容不同。 例如，ITU-T G.8012/Y.1308 定义了以太网NNI。 这个标准适用于IEEE 802.3系列规定的以太网接口以及传送网承载以太网 (EoT)的接口。 传输设备包括光纤通信、微波通信和卫星通信等系统，而网络节点包含许多种类，如64 kbps电路节点、宽带交换节点等。 既可以是只有复用功能的简单节点，也可以是具有传输、复用、交叉连接和交换功能的复杂节点。 文章浏览阅读3.6w次，点赞3 …

Introduction The framework for MPLS in transport networks provides reference models for the MPLS Transport Profile (MPLS-TP) Transport Service Interfaces, which are a User-to-Network Interface (UNI) and a Network-to-Network Interface (NNI). This document updates those reference models to show detailed reference points for these interfaces ...

2024年12月9日 · MPLS（Multiprotocol Label Switching）：用于数据包交换的MPLS技术，能够通过标签来标识和转发数据流，在MPLS网络中，NNI接口帮助实现跨MPLS域的数据传输。 OSPF、EIGRP等路由协议 ：这些协议用于跨区域或跨网络的路由选择，确保不同网络之间的数据流向。

2024年2月27日 · In telecommunications, a network-to-network interface (NNI), also known as a network node interface, is a physical or virtual connection between two or more different networks. It defines the signalling and network management between two networks, allowing them to communicate seamlessly regardless of the underlying protocols they use.

The MPLS-TP Network-Network Interface (NNI) provides the interface between two MPLS-TP PEs in different administrative domains. When MPLS-TP is used to provide a transport service for, e.g., IP services that are a part of a Layer 3 VPN, then packets are transported in the same manner as specified in [ RFC4364 ].

2022年11月5日 · Frame Relay over MPLS and DTE DCE and NNI Connections. You can configure an interface as a DTE device or a DCE switch, or as a switch connected to a switch with network-to-network interface (NNI) connections.

2020年1月23日 · 本文深入解析ptn（分组传送网）技术，介绍其由来、模型及与mpls的关系。 PTN采用T-MPLS协议，简化MPLS并增强OAM功能，提供高效IP业务承载和电信级保护。

nni 在PTN领域， NNI就是PTN设备与PTN设备之间数据传输接口。 UNI与NNI的主要区别是UNI接口承载了用户的原始报文，NNI有PTN设备增加的MPLS标签处理后的报文。