This object specifies whether the Synthetic Loss Measurement (SLM)
single-ended Responder is enabled.
The value 'true' indicates the single-ended SLM Responder is enabled and
if a SLM message is received a SLR will be sent in reply.
The value 'false' indicates the single-ended SLM Responder is disabled.
If a SLM message is received no response will be sent and the message
will be discarded.
This object needs to be persistent upon reboot or restart of a device.
A MEP can be both a single-ended Responder and Controller simultaneously.