Configuring Ieee 802.3Ah Oam Link-Fault Management; Oam Elements Overview - Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual

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OAM Elements Overview

Copyright © 2010, Juniper Networks, Inc.
Information OAM PDU—A variable-length OAM PDU that is used for the discovery
process. This OAM PDU contains local, remote, and organization-specific information.
Event notification OAM PDU—A variable-length OAM PDU that is used for link
monitoring. This type of OAM PDU might be transmitted multiple times to improve the
probability of a successful receipt, such as in environments that result in high-bit errors.
Event notification OAM PDUs also include a timestamp to signify the time at which
they are triggered.
Loopback control OAM PDU—An OAM PDU predefined with a length of 64 bytes to
enable or disable the remote loopback command.
Vendor-specific OAM PDU—A variable-length OAM PDU that enables the addition of
vendor-specific extensions to OAM.
OAM Feature Overview on page 230
Configuring 802.3ah OAM Link-Fault Management on page 238
ethernet oam lfm
ethernet oam lfm remote-loopback
ethernet oam lfm remote-loopback supported
IEEE 802.3ah defines OAM procedures for a single point-to-point Ethernet link. Ethernet
OAM is a slow protocol with limited bandwidth requirements. The frame transmission
rate is limited to a maximum of 10 frames per second. As a result, the impact of OAM on
normal operations is negligible. However, when link monitoring is enabled, the CPU must
poll error counters frequently. In this case, the required processor memory and usage are
proportional to the number of interfaces that have to be polled.
Two major elements, the OAM client and the OAM sublayer, make up the Ethernet OAM.
The OAM sublayer resides above the MAC layer and below the logical link control (LLC)
layer. The OAM sublayer presents a MAC data interface to MAC clients and an OAM client
interface to OAM clients. Figure 31 on page 228 shows the OAM sublayer interfaces. For
effective interoperation and enhanced collaboration with 802.3ad link aggregation, the
OAM sublayer exists below the LAG bundle. The LAG bundle is present between the OAM
sublayer and the MAC client.
Chapter 7: Configuring IEEE 802.3ah OAM Link-Fault Management
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