Remote Defect Indication

Remote defect indication (RDI) enables a maintenance entity group end point (MEP) to send continuity check messages (CCMs), each carrying an RDI flag, to notify a remote MEP (RMEP) of faults.

The RDI implementation is as follows:

• After a local MEP detects a link fault using the continuity check (CC) function, the local MEP sets the RDI flag to 1 in CCMs and sends the CCMs along a reverse path to notify its RMEP of the fault.

• After the fault is rectified, the local MEP sets the RDI flag to 0 in CCMs and sends them to inform the RMEP that the fault is rectified.

• The RDI function is associated with the proactive continuity check function and takes effect only after the continuity check function is enabled.
• The RDI function applies only to bidirectional links. In the case of a unidirectional LSP, before RDI can be used, a reverse path must be bound to the LSP.