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Печатать страницуChapter 1 OAM Configuration
1.1 OAM Overview
EFM OAM of IEEE 802.3ah provides point-to-point link trouble/performance
detection on the single link. However, EFM OAM cannot be applied to EVC and
so terminal-to-terminal Ethernet monitoring cannot be realized. OAM PDU cannot
be forwarded to other interfaces. Ethernet OAM regulated by IEEE 802.3ah is a
relatively slow protocol. The maximum transmission rate is 10 frames per second
and the minimum transmission rate is 1 frame per second.
1.1.1 OAM Protocol's Attributes
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Supporting Ethernet OAM devices and OAM attributes
The Ethernet OAM connection process is called as the Discovery phase
when the OAM entity finds the OAM entity of the remote device and a
stable session will be established. During the phase, the connected
Ethernet OAM entities report their OAM mode, Ethernet OAM configuration
information and local-node-supported Ethernet OAM capacity to each other
by interacting the information OAM PDU. If the loopback configuration,
unidirectional link detection configuration and link-event configuration have
been passed on the Ethernet OAM of the two terminals, the Ethernet OAM
protocol will start working on the link layer.
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Link monitoring
The Ethernet OAM conducts the link monitoring through Event Notification
OAM PDU. If the link has troubles and the local link monitors the troubles,
the local link will transmits Event Notification OAM PDU to the peer
Ethernet OAM to report the normal link event. The administrator can
dynamically know the network conditions through link monitoring. The
definition of a normal link event is shown in table 1.
Normal Link Event
Period event of error signal
Error frame event
Period event of error frame
Second frame of error
frame
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Table 1 Definition of the normal link event
Specifies the signal number N as the period. The number of
error signals exceeds the defined threshold when N signals are
The number of error frames exceeds the defined threshold
during the unit time.
Specifies the frame number N as the period. The number of
error frames exceeds the defined threshold when N frames are
Specifies that the number of seconds of the error frame
exceeds the defined threshold in the designated M second.
OAM Configuration
Definition
received.
received.
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