RDI is a flag in the continuity check message (CCM) frame. It is sent to the peer MEP through the reverse channel. The working principles are as follows:
•When the local MEP detects a link fault using the continuity check (CC) function, it sets the RDI flag in a CCM frame to 1 and sends the frame to its peer MEP to notify the peer MEP of the link fault.
•After the link fault is removed, the local MEP sets the RDI flag in a CCM frame to 0 and sends the frame to its peer MEP to notify the peer MEP of the link fault removal.
A maintenance association end point (MEP), upon detecting a defect condition, notifies its peer MEP of the defect condition. Upon receiving the notification, the peer MEP reports a remote defect indicator (RDI) alarm.
NOTE:
•RDI takes effect only when the CC function is enabled.
•RDI applies only to bidirectional connections. To apply RDI to a unidirectional tunnel, specify a reverse tunnel first.
The local MEP transmits RDI frames to the peer MEP in the following scenarios:
•The local MEP detects OAM alarms such as LOCV, UNEXPMEG, or UNEXPMEP.
•The local MEP receives AIS frames.
The following takes the local MEP detecting an LOCV alarm as an example to illustrate how an RDI alarm is reported. As shown in Figure 1, MEP2 detects an LOCV alarm and transmits an RDI frame to MEP1 through the reverse channel. After receiving the RDI frame, MEP1 reports an RDI alarm.
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