Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 610)

560 Brocade 6910 Ethernet Access Switch Configuration Guide
53-1002581-01
CFM Commands
25
mac-address – MAC address of a remote MEP that is the target of the delay-measure
message. This address can be entered in either of the following formats: xx-xx-xx-xx-xx-xx or
xxxxxxxxxxxx
domain-name – Domain name. (Range: 1-43 alphanumeric characters)
ma-name – Maintenance association name. (Range: 1-43 alphanumeric characters,
maximum length is 44 minus the length of the domain name)
count – The number of times to retry sending the message if no response is received
before the specified timeout. (Range: 1-5)
interval – The transmission delay between delay-measure messages. (Range: 1-5
seconds)
packet-size – The size of the delay-measure message. (Range: 64-1518 bytes)
timeout - The timeout to wait for a response. (Range: 1-5 seconds)
Default Setting
Count: 5
Interval: 1 second
Size: 64 bytes
Timeout: 5 seconds
Command Mode
Privileged Exec
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 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.
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.