OmniSwitch AOS Release 6 Network Configuration Guide September 2009 page 16-1
16 Configuring EFM
(LINK OAM)
Ethernet in the First Mile (EFM), also known as LINK OAM, is a collection of protocols specified in
IEEE 802.3ah, defining Ethernet in the access networks that connects subscribers to their immediate
service provider. EFM, EFM-OAM and LINK OAM refers to IEEE 802.3ah standard.
LINK OAM (Operation, Administration, and Maintenance) is a tool monitoring Layer-2 link status by
sending OAM protocol data units (OAMPDUs) between networked devices on the first mile. The first
mile network refers to the connection between the subscriber and the public carrier network. LINK OAM
is mainly used to address common link-related issues on the first mile. It helps network administrators
manage their networks effectively.
By enabling LINK OAM on two devices connected by a point-to-point connection, network administra-
tors can monitor the status of the link, detect faults in network segments, and probe link errors by using
loopback testing.
In This Chapter
This chapter describes the LINK OAM feature and how to configure it through the Command Line Inter-
face (CLI). CLI commands are used in the configuration examples; for more details about the syntax of
commands, see the OmniSwitch CLI Reference Guide. This chapter provides an overview of LINK OAM
and includes the following information:
• “LINK OAM Specifications” on page 16-2
• “LINK OAM Defaults” on page 16-3
• “Quick Steps for Configuring LINK OAM” on page 16-4
• “Interaction With Other Features” on page 16-8
• “Configuring Link Monitoring” on page 16-10
• “Configuring LINK OAM” on page 16-9
• “Verifying the LINK OAM Configuration” on page 16-12
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