Edge-Core ES3510MA-DC Management Manual page 1000

| CFM Commands
C 40
HAPTER
Size: 64 bytes
Timeout: 5 seconds
C M
OMMAND ODE
Privileged Exec
C U
OMMAND SAGE
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 command.
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)
The MEP can also make two-way frame delay variation measurements
◆
based on its ability to calculate the difference between two subsequent
two-way frame delay measurements.
E
XAMPLE
This example sends periodic delay-measure requests to a remote MEP.
Console#ethernet cfm delay-measure two-way dest-mep 1 md voip ma rd
Type ESC to abort.
Sending 5 Ethernet CFM delay measurement message, timeout is 5 sec.
Sequence Delay Time (ms.)
-------- ----------------
1 < 10
2 < 10
3 < 10
4
5 < 10
Success rate is 100% (5/5), delay time min/avg/max=0/8/40 ms.
Average frame delay variation is 16 ms.
Console#
– 1000 –
Delay Variation (ms.)
---------------------
0
0
0
40 40
40