Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 93
ah, Link Layer OAM Overview
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8 802.3ah s 802.3ah is available only on platform: A metropolitan area network (MAN) is a set of LANs, geographically separated but managed by a single entity. If the distance is large-across a city, for example-connectivity between LANs is managed by a service provider. While LANs use Ethernet, service providers networks use an array of protocols (PPP and ATM), and a variety access technologies. Implementing Ethernet from end to end, across the service provider network, simplifies design and management, increases scalability and bandwidth, and reduces costs. Ethernet in a service provider environment introduces the concept of Carrier-class Ethernet and requires some basic management and diagnostic tools. Ethernet Operations, Administration, and Maintenance (OAM) is that toolset, which can be used to install, monitor, troubleshoot, and manage Ethernet infrastructure deployments. It consists of three main areas: 1. Service Layer OAM: IEEE 802.1ag, Connectivity Fault Management (CFM) 2. Link Layer OAM: IEEE 802.3ah, Ethernet in the First Mile (EFM) OAM 3. Ethernet Local management Interface (MEF-16 E-LMI) Link Layer OAM Overview Link Layer OAM introduces the toolset required to effectively monitor the link between the customer and service provider, which is called the first mile. Currently, service providers use a variety of access technologies including ISDN, DSL, and coax cable in the first mile. Implementing Ethernet here reduces the types of equipment in the subscriber access network, simplifying installation and management, and increasing bandwidth. Link Layer OAM performs four primary operations for the purposes of link status, performance monitoring, and fault detection and isolation for Ethernet in the First Mile: • OAM Discovery-detects whether the remote system is OAM capable, and negotiates OAM parameters. • Link Event Monitoring-defines a set of events that may impact link operation, and monitors the link for those events. • Remote Loopback-directs the remote system to reflects back frames that the local system transmits so that an administrator can isolate a fault. • Remote Failure Indication-notifies a peer of a critical link event. 802.3ah | 93
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