C
HAPTER
41
| CFM Commands
Delay Measure Operations
– 1359 –
â—† 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)
â—† 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.
EXAMPLE
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.) Delay Variation (ms.)
-------- ---------------- ---------------------
1 < 10 0
2 < 10 0
3 < 10 0
4 40 40
5 < 10 40
Success rate is 100% (5/5), delay time min/avg/max=0/8/40 ms.
Average frame delay variation is 16 ms.
Console#
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