Carrier Ethernet Explained: Benefits and Challenges

Carrier Ethernet is a technology that has revolutionized the way we think about data transmission. It's a versatile and scalable solution that can be used for a wide range of applications.

Carrier Ethernet provides a reliable and efficient way to transport data over long distances, making it an ideal choice for businesses and organizations that need to connect multiple locations.

One of the key benefits of Carrier Ethernet is its ability to support multiple services, including voice, video, and data. This makes it an attractive option for companies that need to integrate different types of traffic onto a single network.

Carrier Ethernet is also highly scalable, allowing it to adapt to changing business needs. This means that businesses can start small and scale up as needed, without having to worry about upgrading their infrastructure.

Carrier Ethernet is a set of services specified by the Metro Ethernet Forum (MEF), an organization of service providers and equipment vendors. It defines services to connect Ethernet LANs within a metropolitan area.

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Carrier Ethernet was developed in response to the growing need to connect networks over larger areas. This need arose as customers began to use Ethernet networks for more complex applications.

Carrier Ethernet connects distant Ethernet LANs like they are all part of a single bridged LAN, allowing remote workers to access databases or applications as if they were located in the same facility.

Ethernet's dominance in enterprise networks has led to high production-volume components, resulting in extremely low cost per bit. This has made Ethernet a popular choice for connecting networks.

Carrier Ethernet has five specific attributes that distinguish it from familiar LAN-based Ethernet: standardized services, reliability, scalability, service management, and quality of service. These attributes ensure that Carrier Ethernet meets the needs of businesses and organizations.

Rates up to 100 Gigabit Ethernet were standardized in 2010 and 2011, making it possible to connect networks over even larger areas. This has enabled businesses to expand their networks and access new services.

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Carriers face significant constraints when it comes to providing Ethernet services.

They have three main needs: to provide Ethernet services to customers, to leverage the cost and volume advantages of Ethernet technologies, and to replace non-Ethernet technologies with Ethernet competitors that can handle storage, backup, and high-definition video.

Carriers must balance the need for expansion with the risk of exceeding provisioning limits, which can result in poor quality of service.

To avoid this, carriers must expand their services conservatively and prioritize quality of service (QoS).

This means paying close attention to the features that guarantee service quality, such as transfer certainty and low latency.

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Carrier Ethernet services are delivered globally and locally using standardized services such as Ethernet Private Line and Ethernet Virtual Private Line. These services can be delivered to customers without requiring them to change their network or LAN equipment.

The MEF Certification Program ensures the delivery of Carrier Ethernet with five attributes, and it certifies both service providers and equipment vendors to carry Carrier Ethernet services. iConverter Network Interface Devices are MEF 9 certified compliant, which includes the delivery of Ethernet Private Line, Ethernet Virtual Private Line, Ethernet Private LAN, and Ethernet Virtual Private LAN services.

Ethernet Line services provide point-to-point Ethernet connectivity, while Ethernet LAN services are used to interconnect multiple sites.

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Network reliability is crucial for Carrier Ethernet services. They must meet demanding quality and availability requirements, detecting and recovering from incidents without impacting users.

Service OAM (Operations, Administration, and Management) is key to achieving this reliability. It enables rapid fault detection and management, and protection through geographical diversity and rapid recovery.

iConverter NIDs (Network Interface Devices) enable reliable Ethernet services with end-to-end Service OAM and redundant link protection.

Here are some examples of Service OAM features:

In addition to Service OAM, Carrier Ethernet services also use protection mechanisms like Link Fail with 50ms Failover Protection Switching to ensure reliability.

Ethernet services are often carried across wide area networks using other technologies, such as Carrier-Ethernet transport, which is emerging as a viable option for Carrier-Ethernet services.

Ethernet services are typically carried across wide area networks using other technologies, such as Synchronous Optical Network, Synchronous Digital Hierarchy, and MPLS.

The MEF does not specify how Ethernet services are to be provided in a carrier network, but it does define three types of Ethernet services: E-Line, E-LAN, and E-Tree.

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These services can be provided using a variety of transport technologies, including MPLS, which can support both point-to-point and multipoint services.

Ethernet services are often carried over IP/MPLS networks, making use of a wide range of IP-related protocols, including pseudowire standards.

Carrier Ethernet services can be used to offer service-level agreements that guarantee higher data rates and quality of service for voice, video, data, and mobile services.

Service providers can choose from available wide area technologies to provide the level of service, as defined services describe the service but not the underlying technology.

Data transmission occurs by using transport technologies, like Synchronous Optical Network, Synchronous Digital Hierarchy, MPLS, and other WAN technologies, that meet the necessary performance requirements.

Here are some examples of Ethernet services:

Carrier Ethernet services are standardized by the MEF, which defines three key services: Ethernet Virtual Private Line (E-Line), Ethernet Virtual Private LAN (E-LAN), and Ethernet Virtual Private Tree (E-Tree). These services provide a clear separation between the user and provider networks.

E-Line is a service connecting two customer Ethernet ports over a WAN, while E-LAN is a multipoint service connecting a set of customer endpoints, giving the appearance of a bridged Ethernet network connecting the sites. E-Tree is a multipoint service connecting one or more roots and a set of leaves, but preventing inter-leaf communication.

Carrier Ethernet demarcation is a key element in Carrier Ethernet services and transport networks, enabling service providers to extend their control over the entire service path. This is achieved by connecting customer premises equipment (CPE) to the network with provider-owned demarcation devices.

Carrier Ethernet demarcation devices (EDD) are required to support services such as Ethernet Private Line (EPL), Ethernet Virtual Private Line (EVPL or E-LAN), and Ethernet Virtual Private Tree (E-Tree). These devices must support service level agreement (SLA) management capabilities, with consistent performance over various access lines.

Here are the key features of Carrier Ethernet demarcation devices:

The MEF Certification Program for Carrier Ethernet ensures the delivery of Carrier Ethernet with the five attributes, including the delivery of Ethernet Private Line, Ethernet Virtual Private Line, Ethernet Private LAN, and Ethernet Virtual Private LAN services.

Carrier Ethernet technologies have made a concerted effort to resolve the limitations of Ethernet in the WAN, allowing for the use of "native" Ethernet technologies by network providers.

The Institute of Electrical and Electronics Engineers (IEEE) 802.1 and 802.3 standards committees have played key roles in addressing scalability and management issues. These standards have enabled Ethernet networks of planetary scale.

The IEEE 802.3 Working Group has been working to simplify the transport of 40G and 100G technologies, in close cooperation with the ITU.

Carrier Ethernet standards have been developed by MEF to ensure performance and reliability. Some vital techniques used to maintain reliability include quick detection of network faults and isolating faults and correction.

Carrier Ethernet has proven to be highly successful, with applications developed to take advantage of its capabilities and flexibility.

Here are some key Carrier Ethernet standards:

Scalability is crucial for Carrier Ethernet services, and it's great to see that industry efforts have made significant strides in this area. Scalability in bandwidth delivery is a must, and iConverter NIDs deliver scalable bandwidth from less than 1 Mbps to 1 Gbps in granular increments.

The network also needs to be scalable, delivering services to subscribers globally. This is where compact, cost-effective, and easily deployable iConverter NIDs come in, with zero-touch provisioning and built-in RFC 2544 test-head.

Carrier-Class Ethernet proponents argue that Ethernet is the best for Metro Area Networks because all data traffic originates as Ethernet. This ubiquitous presence in LANs worldwide drives down the cost of Ethernet as a technology.

Provider Backbone Bridges (PBB) provide scalability and a secure demarcation, while Provider Backbone Bridge Traffic Engineering (PBB-TE) provides for traffic-engineering and an effective transport for protected Ethernet services.

Ethernet technologies have made significant strides in recent years to overcome limitations in the WAN. The IEEE 802.1 and 802.3 standards committees have played key roles in addressing scalability and management issues.

Ethernet-centric transport technologies, also known as IEEE-based, are a popular choice for Carrier Ethernet networks. This category includes Provider Bridging (802.1ad), Provider Backbone Bridging (802.1ah), and Provider Backbone Bridging with Traffic Engineering (802.1Qay).

MPLS-centric transport technologies are another widely used option. Services like Virtual Private Wire Service (VPWS), Virtual Private LAN Service (VPLS), and MPLS Transport Profile (MPLS-TP) are all part of this category.

Optical-centric transport technologies, which include Synchronous Digital Hierarchy (SDH), Dense Wavelength Division Multiplexing (DWDM), and Optical Transport Network (OTN), are less common due to their limitations in supporting multipoint connectivity.

Carrier Ethernet operates as an overlay and can use various transport technologies, such as MPLS, optical transmission, or Ethernet, for the underlying infrastructure. Each technology offers different benefits and limitations, depending on the operator's resources, capacity, expertise, and implementation choices.

Here are the three main categories of transport technologies:

Standards are in place to ensure Carrier Ethernet services meet customer requirements for performance and reliability. The MEF has developed standards for each Carrier Ethernet function, which carriers must adhere to.

The MEF Certification Program for Carrier Ethernet ensures the delivery of Carrier Ethernet with five attributes. This certification program is crucial for service providers and equipment vendors.

Carrier Ethernet services include Ethernet Private Line, Ethernet Private LAN, Ethernet Virtual Private Line, and Ethernet Virtual Private LAN services. These services are delivered globally and locally.

Here are some key MEF standards:

MEF 14 also includes parameters like Frame Delay Variation (FDV) and Excess Burst Size (EBS). These standards are vital for maintaining reliability and meeting customer requirements.

The use of standardized services like Carrier Ethernet has been highly successful, and applications have developed to take advantage of its capabilities.

Service management is crucial for Carrier Ethernet, as it enables operators to monitor, diagnose, and centrally manage their network.

Service Providers must have the ability to monitor, diagnose and centrally manage their network, using standards-based vendor independent implementations.

Some transport technologies support Class of Service (CoS) while others don't, treating all service frames identically and providing the same Quality of Service (QoS) to all service frames.

In practice, this is undesirable while managing modern traffic, as it can lead to inconsistent performance and poor user experience.

Effective protection switching or restoration is a key factor in transport technologies, and a common benchmark for achieving this is within 50ms.

Scalability is also a critical aspect of Carrier Ethernet, and some technologies provide unlimited scalability, while others are limited by factors such as Media Access Control (MAC) table overflow.

When comparing transport technologies, it's essential to consider the class of service (CoS) support they offer. Some technologies support CoS, while others don't, which can lead to the same Quality of Service (QoS) being provided to all service frames.

Bandwidth is another crucial factor, as technologies differ in their offered Fractional Bandwidth (FBW) capability and ability to support service bandwidths of arbitrary size. Granularity can't be ignored, especially when dealing with Ethernet traffic.

Protection methods are also a key consideration, with some technologies achieving fault detection and protection switching within 50ms. Typical protection methods used with Ethernet include G.8031, G.8032, and 802.3ad.

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Scalability is a vital aspect, with some technologies providing unlimited scalability. However, scalability can be limited by factors like MAC table overflow, which can occur when too many addresses are learned.

MAC learning is essential for supporting multipoint services, such as LAN and tree-type topologies. Some transport technologies are designed to support only point-to-point services, which can be a significant limitation for operators.

Service management is crucial for network maintenance and troubleshooting. It includes software and network management systems that help provision, troubleshoot, and maintain the network.

Service Providers need to be able to monitor, diagnose, and centrally manage their network using standards-based vendor-independent implementations. This allows them to keep their network running smoothly and efficiently.

iConverter NIDs support several management protocols, including TELNET, SNMPv3, and Secure IP-Less management. These protocols enable integration with telecom management and OSS systems.

Remote provisioning, service OAM performance monitoring, and fault notification are also supported by iConverter management. This means that Service Providers can remotely manage their network and receive notifications in case of any issues.

Carrier Ethernet services rely on external views of the provided services, rather than internal details like voltage levels and cable length. This allows Service Providers to choose from various wide area technologies to meet their performance requirements.