Echo request/response
frames can be assigned to any CoS.
Flush The client can request to perform a flush operation. A flush has the effect of clearing
the selected ringlet of previously sourced traffic. A flush is expected to be used when
changing the ringlet selection by the client, to implement client controlled steer protection,
Resilient Packet Ring (RPR) 347
or for traffic engineering reasons. A flush is a special control frame that is sent from a
station to itself. Flush operations prevent mis-order during steer protection.
The flush frames can be assigned to any CoS, with distinct flush action results, as
follows:
?– ClassA. Previously-sourced primary transit queue (PTQ) traffic is flushed.
?– ClassB or classC. Previously-sourced PTQ and secondary transit queue (STQ) traffic
is flushed.
Organization Specific A client may use the optional organization specific OAM frame
to implement additional OAM functions not specified by the standard.
Stations may accumulate performance parameters related to the RPR layer to enable
the detection of developing failures before a total outage is detected.
RPR error monitoring is based on the fairness frame errors.
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