Traffic Distribution Details - Frames
RX (Received) Frames
Total
: Total number of frames received
Test
: Number of test frames received
Non-Test:
Number of non-test frames received
TX (Transmitted) Frames
Total: Number of test frames transmitted
Flow Control:
Flow control is the FC-2 control process to pace the flow of frames between Nx_Ports, an Nx_Port and the
Fabric and within the Fabric to prevent overrun at the receiver.
Flow control is managed between Nx_Ports (end-to-end) and between FC_Ports (buffer-to-buffer). Flow control
management has variations dependent upon the service class, however Class 3 uses only buffer-to-buffer flow control.
RR-RDY:
For Class 3 frames transmitted and received, a R_RDY is issued when a receive buffer is available.
Memory or “buffers” to temporarily store frames as they arrive and until they are assembled in sequence, and delivered to
the upper layer protocol. Buffer Credits are the number of frames a port can store. To track the number of frames
transmitted for which R_RDY responses are outstanding, the transmitting FC_Port uses the BB_Credit_CNT.
BB Credits Used
: The number of unacknowledged or outstanding frames awaiting R_RDY responses from the directly attached
FC_Port.
BB Credits Available
: The number of frames transmitted and received R_RDY responses from the directly attached FC_Port.
FC-BERT/FC-Throughput - Frame Distribution
Traffic Distribution - Traffic Type
Fibre Channel supports three classes of services, and a fourth which is a combination of classes 1 and 2.
Similar to ATM, different classes allow Fibre Channel to support a variety of communication needs.
Class 1:
Provides a circuit-emulation service for time-sensitive applications such as video teleconferencing.
Designed for dedicated, non-bursty links between supercomputers. Class 1 traffic is circuit-switched.
Class 2
: Provides guaranteed delivery for connectionless traffic.
Class 2 traffic is switched on each frame rather than on a connection. An acknowledgment from the destination provides
an end-to-end guarantee of delivery.
Class 3:
Offers a best-effort connectionless service.
Class 3 is similar to Class 2, except that no guarantee is given for delivery.
FC-BERT/FC-Throughput - Traffic Type Distribution
RXT-3900 e-Manual D07-00-111P Rev A00
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