User's Manual

Table Of Contents
333
Users Manual of CS-6306R
Chapter 33. OAM Configuration
OAM Configuration 33.1
33.1.1 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.
33.1.1.1 OAM Protocol’s Attributes
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.
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.
Table 1 Definition of the normal link event
Normal Link Event Definition
Period event of error signal
Specifies the signal number N as the period. The number of
error signals exceeds the defined threshold when N signals are
received.
Error frame event The number of error frames exceeds the defined threshold
during the unit time.
Period event of error frame
Specifies the frame number N as the period. The number of
error frames exceeds the defined threshold when N frames are
received.
Second frame of error
frame
Specifies that the number of seconds of the error frame exceeds
the defined threshold in the designated M second.
Remote trouble indication