EFM configuration
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Chapter 34. EFM configuration
34.1 Brief Introduction to EFM
EFM (Ethernet of First Mile) as the first mile Ethernet, defined by the IEEE 802.3ah
standard, used for the two devices point to point Ethernet link between the management and
maintenance.
34.1.1 EFM Main Function
EFM Ethernet can effectively improve the management and maintenance capabilities to
ensure the stable operation of the network, its main features include:
Table 34-1 EFM main function
Function
Remarks
EFM
auto-discovery
EFM functionality built on the basis of connections, EFM connection
establishment process is achieved by the auto-discovery of EFM. This
feature is connected EFM entities interact Information OAMPDU informed
by their EFM configuration information and the side support EFM
capability information, when the EFM entities received after the end of the
configuration parameters to determine whether to establish EFM
connections.
EFM work in two modes: active mode and passive mode, EFM connected
only by the active mode of EFM entity initiated the passive mode EFM
physical entity can only wait for the end of the connection requests are in a
passive mode of the two an EFM can’t be established between the entities
connected.
Remote failure
indication
When the device detects a link event of an emergency, the fault will end
EFM entity's Flag by Information OAMPDU fault information field (the type
of emergency event link) EFM notification to the peer entity. In this way,
administrators can log information by observing the dynamic
understanding of the link state, the corresponding error in a timely manner
for processing.
Event types, including emergency Link Fault, Dying Gasp and Critical
Event of three.
Link monitoring
capabilities
Link monitoring function is used in a variety of environments and found
that the link layer fault detection, EFM through interactive Event
Notification OAMPDU to monitor the link: When the end of the EFM to
detect the general physical link event, the Event Notification sent to its
peer OAMPDU for notification, the administrator can log information by
observing the network to dynamically control the situation.
Event types include general link-errored-symbol-period,
errored-frame, errored-frame-period, errored-frame-seconds four.
Remote
loopback
Remote loopback is active mode EFM entity sends to the remote except
OAMPDU than all other messages, the remote receives the packet
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