Upon notification of an Ethernet CSF event from the corresponding ingress client port, frames with ETH-CSF information are generated and propagated by an MEP.
As a result, the frames with ETH-CSF information are not propagated until and unless there is a fault detected on the corresponding ingress client port. An appropriate log message is thrown to indicate the fault detected at the Ethernet client port and the transmission of the ETH-CSF message to the RMEP.
The transmission of packets with CSF information can be enabled or disabled on an MEP through a CLI configuration.
Upon receiving an Ethernet CSF notification from the ingress client port, the associated MEP can immediately start the periodic transmission of frames with ETH-CSF information. This continues until the Ethernet CSF indication is cleared by the source MEP when the local fault with the associated client port is cleared, that is, when it witnesses the link up event in this case.
The clearance of the Ethernet CSF condition by the source MEP can be communicated to the peer RMEP to clear its Ethernet client fault condition in one of two ways: