IEEE 802.3ah OAM Link-Fault Management Overview

Ethernet interfaces capable of running at 100 Mbps or faster on MX Series, M Series (except M5 and M10 routers), and T Series routers support the IEEE 802.3ah standard for Operation, Administration, and Management (OAM). You can configure IEEE 802.3ah OAM on Ethernet point-to-point direct links or links across Ethernet repeaters. The IEEE 802.3ah standard meets the requirement for OAM capabilities as Ethernet moves from being solely an enterprise technology to being a WAN and access technology, as well as being backward-compatible with existing Ethernet technology. Junos OS supports IEEE 802.3ah link-fault management.

The features of link-fault management are:

• Discovery
• Link monitoring
• Remote fault detection
• Remote loopback

Note: Ethernet running on top of a Layer 2 protocol, such as Ethernet over ATM, is not supported in OAM configurations.