Brocade 6910 Ethernet Access Switch Configuration Guide (Supporting R2.2.0.0) - Manual (Page 1078)

1022 Brocade 6910 Ethernet Access Switch Configuration Guide
53-1002651-02
43
Connectivity Fault Management
One-Way Delay Measure
• If a MEP is enabled to generate frames with one-way delay measurement (DM) information, it
periodically sends DM frames to its peer MEP in the same MA.
• When one-way frame delay measurements are made, the transmitting MEP sends a frame with
DM request information with the TxTimeStampf (timestamp at the time of sending a frame with
DM request information). The receiving MEP can compare this value with the RxTimef, the time
at the reception of DM frame, and calculate the one-way frame delay as:
Frame Delay = RxTimef - TxTimeStampf
• One-way frame delay measurement requires the clocks at the transmitting and receiving MEPs
to be synchronized. For the purposes of frame delay variation measurement, which is based on
the difference between subsequent frame delay measurements, the requirement for clock
synchronizations can be relaxed since the out-of-phase period can be eliminated in the
difference of subsequent frame delay measurements.
Parameters
These parameters are displayed:
Configuration Settings
• MD Index – Domain index. (Range: 1-65535)
• MA Index – MA identifier. (Range: 1-2147483647)
• Source MEP ID – The identifier of a source MEP that will send the delay-measure message.
(Range: 1-8191)
• Target
• MEP ID – The identifier of a remote MEP that is the target of a delay-measure message.
(Range: 1-8191)
• MAC Address – MAC address of a remote MEP that is the target of a delay-measure
message. This address can be entered in either of the following formats: xx-xx-xx-xx-xx-xx or
xxxxxxxxxxxx
• Count – The number of times to retry sending the message if no response is received before
the specified timeout. (Range: 1-5; Default: 5)
• Packet Size – The size of the delay-measure message. (Range: 64-1518 bytes; Default: 64
bytes)
• Interval – The transmission delay between delay-measure messages. (Range: 1-5 seconds;
Default: 1 second)
• Timeout – The timeout to wait for a response. (Range: 1-5 seconds; Default: 5 seconds)
This parameter only applies to Two-Way DM.
Result
• Sequence – The sequence number of transmitted messages.
• Delay Time – The delay between message transmission and reception.
• Delay Variation – The variation in delay time.