One-way delay measurement, Configuration considerations – Brocade Multi-Service IronWare Administration Guide (Supporting R05.6.00) User Manual
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Multi-Service IronWare Administration Guide
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One-way Delay Measurement
6
Session index 1
When the LMM session stopped
Session index 1
When the Average Frame Loss Ratio greater than Threshold Average Frame Loss Ratio
index 1 has crossed the forward average threshold value, with value 35000.
When the Maximum Frame Loss Ratio greater than Threshold Maximum Frame Loss Ratio
index 1 has crossed the forward maximum threshold value, with value 60000.
One-way Delay Measurement
One-way delay measurement can be used for on-demand or proactive OAM to measure frame delay
and frame delay variation. Frame delay and frame delay variation measurements are performed by
sending periodic frames with Ethernet Delay Measurement information to the peer MEP and
receiving frames with Ethernet Delay Measurement information from the peer MEP during
proactive measurement session and/or the diagnostic interval. Each MEP may perform frame
delay and frame delay variation measurement.
When a MEP is enabled to generate frames with one-way delay measurement information, it
periodically sends frames with one-way delay measurement information to its peer MEP in the
same ME. When a MEP is enabled to generate frames with one-way delay measurement
information, it also expects to receive frames with one-way delay measurement information from its
peer MEP in the same ME.
A MIP is transparent to the frames with one-way delay measurement information and therefore
does not require any information to support one-way delay measurement functionality.
A MEP transmits frames with one-way delay measurement information with the following
information element:
•
TxTimeStampf: Timestamp at the transmission time of one-way delay measurement frame
The receiving MEP can compare this value with the RxTimef, the time at the reception of a one-way
delay measurement frame and calculate the one-way frame delay as:
•
Frame Delay = RxTimef - TxTimeStampf
Configuration considerations
•
Only one initiator session and one receiver session will be active per Source MEP per priority.
•
Maximum of 32 one-way delay measurement sessions (both initiator and/or receiver sessions
together) can be configured per source MEP.
•
Maximum of 100 one-way delay measurement sessions can be activated per system at any
given point of time.