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    IEEE 802.3ah OAM Link-Fault Management Overview

    Ethernet interfaces capable of running at 100 Mbps or faster on EX Series switches, 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

    The following features are not supported:

    • Ethernet running on top of a Layer 2 protocol, such as Ethernet over ATM, is not supported in OAM configurations.
    • Remote loopback is not supported on the 10-Gigabit Ethernet LAN/WAN PIC with SFP+.
    • The remote loopback feature mentioned in section 57.2.11 of IEEE 802.3ah is not supported on T4000 routers.

    Note: Aggregated Ethernet member links will now use the physical MAC address as the source MAC address in 802.3ah OAM packets.

    Modified: 2016-01-28