802.1ag
Ethernet operations, administration, and maintenance (OAM) are a set of tools used to install, monitor,
troubleshoot, and manage Ethernet infrastructure deployments. Ethernet OAM consists of three main areas:
• Service layer OAM — IEEE 802.1ag connectivity fault management (CFM)
• Link layer OAM — IEEE 802.3ah OAM
• Ethernet local management Interface — (MEF-16 E-LMI)
Topics:
• Ethernet CFM
• Maintenance Domains
• Maintenance Points
• Maintenance End Points
• Implementation Information
• Configuring the CFM
• Enable Ethernet CFM
• Creating a Maintenance Domain
• Creating a Maintenance Association
• Create Maintenance Points
• Continuity Check Messages
• Sending Loopback Messages and Responses
• Sending Linktrace Messages and Responses
• Enabling CFM SNMP Traps
• Displaying Ethernet CFM Statistics
Ethernet CFM
Ethernet CFM is an end-to-end per-service-instance Ethernet OAM scheme which enables: proactive
connectivity monitoring, fault verification, and fault isolation.
The service-instance with regard to OAM for Metro/Carrier Ethernet is a virtual local area network (VLAN).
This service is sold to an end-customer by a network service provider. Typically the service provider contracts
with multiple network operators to provide end-to-end service between customers. For end-to-end service
between customer switches, connectivity must be present across the service provider through multiple
network operators.
Layer 2 Ethernet networks usually cannot be managed with IP tools such as internet control message
protocol (ICMP) Ping and IP Traceroute. Traditional IP tools often fail because:
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