Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 1041)

Brocade 6910 Ethernet Access Switch Configuration Guide 991
53-1002581-01
Connectivity Fault Management
42
FIGURE 300 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 559
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)
• 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.
Parameters
These parameters are displayed:
• MD Index – Domain index. (Range: 1-65535)