Upon receiving a CSF frame with ETH-CSF information, an RMEP declares either the beginning or end of an Ethernet remote CSF condition, depending on the received ETH-CSF information.
This received Ethernet C-DCI information is further propagated by the RMEP to the corresponding egress client port when the Ethernet client port is either operationally shut or enabled, respectively, so that the Ethernet client would detect a link down or link up event, respectively.
An Ethernet MEP detects an Ethernet remote CSF condition when an ETH-CSF PDU with no C-DCI information is received.
The clearance of the Ethernet remote CSF condition by the Ethernet client of a RMEP is detected when either of the following occurs:
Upon clearance of the CSF condition by the RMEP, the corresponding Ethernet client port is enabled, and the Ethernet client device would detect the link up event for the port towards the network.
An appropriate log message is thrown to indicate either receiving or clearing of the fault indication (by receiving C-DCI information or as the result of a timeout), with subsequent action on the client port by the RMEP.
Note
In case of an RMEP failure that is due to a Continuity Check Message (CCM) not being received, the client port at the remote side associated with such an RMEP is brought up and made operational.