FRVATS and Fragmentation Operation

Dual- 8

Classifier LLQ/CBWFQ FRTS FIFO Tx-Ring |

Dual- 8

Classifier LLQ/CBWFQ FRTS FIFO Tx-Ring |

Layer 3 Queuing Subsystem Layer 2 Queuing Subsystem Device Driver

• Packets detected in the priority queue or the detection of H.323 call-setup signaling will engage the voice-adaptive traffic shaping and fragmentation mechanism.

The figure shows how FR-VATS is engaged and what occurs on the interface in order for the FR-VATS feature to be used. After being configured, the FR-VATS feature is automatically triggered, throttling back CIR to minCIR, if packets enter the LLQ or if H.323 call-setup signaling is detected. As packets enter the strict priority queue and the circuit is reshaped, fragmentation is engaged at Layer 2 so that priority packets are interleaved with the fragmented data packets. When the strict priority queue is void of packets, the Frame Relay circuit is reshaped back to its CIR, when data packets can burst to CIR or line speed depending on the service level agreement (SLA). Reshaping to the CIR only occurs when there are no strict priority packets in the queue, and in the absence of H.323 call-setup signaling.

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