ES3528MV2 DC_Management Guide-R03

C HAPTER 14 | Basic Administration Protocols
Connectivity Fault Management
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Figure 309: Transmitting Loopback Messages
TRANSMITTING
DELAY-MEASURE
REQUESTS
Use the Administration > CFM (Transmit Delay Measure) page to send
periodic delay-measure requests to a specified MEP within a maintenance
association.
CLI REFERENCES
◆ "ethernet cfm delay-measure two-way" on page 1358
COMMAND USAGE
◆ Delay measurement can be used to measure frame delay and frame
delay variation between MEPs.
◆ A local MEP must be configured for the same MA before you can use
this function.
◆ If a MEP is enabled to generate frames with delay measurement (DM)
information, it periodically sends DM frames to its peer MEP in the same
MA., and expects to receive DM frames back from it.
◆ Frame delay measurement can be made only for two-way
measurements, where the MEP transmits a frame with DM request
information with the TxTimeStampf (Timestamp at the time of sending
a frame with DM request information), and the receiving MEP responds
with a frame with DM reply information with TxTimeStampf copied from
the DM request information, RxTimeStampf (Timestamp at the time of
receiving a frame with DM request information), and TxTimeStampb
(Timestamp at the time of transmitting a frame with DM reply
information):
Frame Delay = (RxTimeStampb-TxTimeStampf)-(TxTimeStampb-
RxTimeStampf)