Brocade Multi-Service IronWare Administration Guide (Supporting R05.6.00) - Manual (Page 259)

Multi-Service IronWare Administration Guide 241
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One-way Delay Measurement
6
• There can be maximum 16 one-way delay measurement sessions (8 Initiator sessions and 8
Receiver sessions) which can be active per MEP.
• The one-way delay measurement receiver session should be started before starting the
initiator session. Otherwise, the one-way delay measurement packets will be dropped at the
receiver, which may lead to inaccurate results.
One-way Delay Measurement
In this case, each MEP sends frame with one-way Ethernet Delay Measurement information to its
peer MEP to facilitate one-way frame delay and/or one-way frame delay variation measurements at
the peer MEP.
One-way Delay Measurement transmission
When configured for one-way delay measurement, a MEP periodically transmits one-way delay
measurement frames with the TxTimeStampf value.
One-way Delay Measurement reception
When configured for one-way delay measurement, a MEP, upon receiving a valid one-way delay
measurement frame, uses the following values to make one-way frame delay measurement. A
one-way delay measurement frame with a valid MEG level and a destination MAC address equal to
the receiving MEP's MAC address is considered to be a valid one-way delay measurement frame.
These values serve as input to the one-way frame delay variation measurement:
• One-way delay measurement frame's TxTimeStampf value
• RxTimef, which is the time at reception of the one-way delay measurement frame
• Frame Delayone-way = RxTimef - TxTimeStampf
Use Cases
The following use cases are supported for one-way delay measurement.
One-way Delay Measurement over VLAN
One-way delay measurement can be done over VLAN where CFM is configured. In this use case,
CFM should be enabled and the down MEP should be configured on the VLAN end-points (tagged
ports) for periodic measurements irrespective of the CFM connectivity. Verify CFM connectivity is up
and running before the one-way delay measurement session is actually started. Otherwise, this
may cause an error.
NOTE
The one-way delay measurement should be configured over CFM, where CFM should be configured
over the VLAN and the down MEPs should be configured only on the tagged ports.