Brocade 6910 Ethernet Access Switch Configuration Guide (Supporting R2.2.0.0) - Manual (Page 1067)

Brocade 6910 Ethernet Access Switch Configuration Guide 1011
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Connectivity Fault Management
This parameter must be less than or equal to the "Duration" parameter.
• Timeout – The timeout to wait for a response. (Range: 1-5 seconds; Default: 1 second)
This parameter only applies to two-way delay-measure messages.
• Packet Size – The size of the delay-measure message. (Range: 64-1518 bytes;
Default: 64 bytes)
Show Group
The parameters on this page are the same as described for the Add Group page, except for the
followin item.
• MEP Bind – Indicates whether or not an attribute group has been bound to a local MEP.
Configure
• MD Index – Domain index. (Range: 1-65535)
• MA Index – MA identifier. (Range: 1-2147483647)
• MEP ID – Maintenance end point identifier. (Range: 1-8191)
• Status – Enables periodic transmission of delay-measure messages.
• Method – Sends periodic delay-measure messages to a specified MEP, stamped with the time
of transmission. Tje following options are supported:
• One-Way – The local MEP sends frames with one-way delay-measure (DM) information to
its peer MEP to facilitate one-way frame delay and one-way frame delay variation
measurements at the peer MEP.
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.
If the switch does not synchronize time from an NTP/SNTP server, one-way delay-measure
messages cannot be transmitted. In other words, the clocks at both the source and target
MEP should be synchronized in order to perform one-way frame delay measurements.