Configuring Connectivity Fault Management 761
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Configuring Connectivity Fault
Management
This chapter describes how to configure the IEEE 802.1ag (also known as
Dot1ag) protocol. Dot1ag (
IEEE Standard for Local and Metropolitan Area
Networks Virtual Bridged Local Area Networks Amendment 5: Connectivity
Fault Management
) enables the detection and isolation of connectivity faults
at the service level for traffic that is bridged over a metropolitan Ethernet
LAN.
The topics covered in this chapter include:
• Dot1ag Overview
• Default Dot1ag Values
• Configuring Dot1ag (Web)
• Configuring Dot1ag (CLI)
• Dot1ag Configuration Example
Dot1ag Overview
With the emergence of Ethernet as a Metropolitan and Wide-Area
Networking technology, different operators often work together to provide
end-to-end services to enterprise customers. This has driven the need of a
new set of OAM (Operations, Administration, and Maintenance) Protocols.
Service-Level Connectivity Fault Management (CFM) is the OAM protocol
provision for end-to-end service-layer instances in carrier networks. CFM
provides mechanisms to support the administrator in performing connectivity
checks, fault detection, fault verification and isolation, and fault notification
per service in the network domain of interest. Unlike Ethernet OAM (IEEE
802.3ah), where the faults are detected and notified on a single point-to-point
IEEE Std. 802.3 LAN, Dot1ag addresses fault diagnosis at the service layer
across networks comprising multiple LANs, including LANs other than 802.3
media.
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