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This document reviews the hierarchical queueing architecture on serial interfaces configured with Frame Relay encapsulation. Frame Relay configuration. The configurations used in this document were captured on a Cisco Series router with the following hardware and software:. The information presented in this document was created from devices in a specific lab environment.

All of the devices used in this document started with a cleared default configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it. For more information on document conventions, refer to Cisco Technical Tips Conventions. The following figure illustrates the two layers of queues when FRTS is applied to the interface.

The two queues include a high-priority queue to carry Voice over IP VoIP and certain control packets and a low-priority automated router queue to carry all other packets.

Depending on the hardware, these interfaces support PVC queues, which ensure one congested VC does not consume all the memory resources and impact other non-congested VCs.

PVC traffic shaping provides more control over traffic flow on an individual VC. Traffic automated router queue combined with VC queueing limits the interface bandwidth consumption for a single VC.

Without any shaping, a VC can consume all interface bandwidth and starve other VCs. If you do not specify shaping values, default values for average rate and automated router queue size are applied.

When the offered load to the VC exceeds the shaping values, excess packets are stored in the VC's packet-buffering queue. Once the packets are buffered, you can apply a queueing mechanism and effectively control the Panel Router Queue order of packets dequeued automated router Juniper Router Sign In Queue queue the VC queue to the interface queue.

By default, the PVC queues use first come, first served queueing with automated router queue queue limit of 40 packets. Use the frame-relay holdq command in map-class configuration mode to change this value. In addition, you can apply WFQ directly inside the map-class with the fair queue command. This command configures your router to classify traffic according to flow and places these flows in their own subqueues.

Execute the show frame-relay pvc 20 command. The following output shows no queueing information because FRTS is not enabled. Configure FRTS using the frame-relay traffic-shaping command in interface configuration mode under the physical interface. Execute the show frame-relay PVC [dlci] command again. By default, the PVC queues use an output queue limit of 40 packets. Use the frame-relay holdq command to configure a non-default value.

The maximum size was The maximum size is now After the Frame Relay frames are enqueued in a PVC queue, they are dequeued to interface-level automated router queue. Traffic from all VCs passes through the interface-level queues. Depending on the automated router queue features, the Frame Relay interface-level queue uses one of the following mechanisms. In other words, if you enable FRF. First, a packet is enqueued to a fancy queue at the VC level.

It is then sent to the interface queue. In this case, WFQ would be applied. When the queueing strategy is WFQ, you can use the show queueing and show queue commands to confirm. Since the queueing strategy is now FIFO, the show queue and show queueing command output changes.

When this new feature is enabled, the traffic-shaping mechanism monitors interface congestion. When the congestion level exceeds a configured value called queue depth, the sending rate of all PVCs is reduced to the minimum committed information Sign Router For Sale Queue rate minCIR.

As soon as interface congestion drops below the queue depth, the traffic-shaping mechanism changes the sending rate of the PVCs back to the committed information rate CIR. The low-priority queue handles fragmented packets data or non-voice packets. The interface-level queueing mechanism automatically changes to dual FIFO when you enable one of the following features:. Data packets larger than the packet size specified in the frame-relay fragment command are first enqueued to a WFQ subqueue.

They are then dequeued and fragmented. After fragmentation, the first segment is transmitted. The remaining segments wait for the next available transmission time for that VC, as determined by the shaping algorithm. At this point, small voice packets and fragmented data packets are interleaved from other PVCs.

Real-time Transport Protocol RTP Automated router queue -- Originally, small data packets were also classified as belonging to the high-priority queue simply because of their size. Automated router queue reserves the high-priority queue for voice and LMI control packets only. In addition, voice packets go into the high Sign On Router Red Queue priority queue at the interface level.

All other packets go into the non-priority queue at the interface level. Use the show interface command to view the size of the two queues. The steps below show the dual FIFO queues and describe how to change the automated router queue sizes. Execute the show interface serial command. The high-priority queue uses a queue limit that is twice the size of the low-priority queue limit. Execute the show interface automated router queue command again and note how the "Output queue" max values have changed.

This allows you to assign automated router queue priority value to each PVC. PIPQ minimizes serialization automated router queue queueing delay at the interface level by ensuring that the high-priority VC is serviced automated router queue. The PIPQ mechanism does not look at the packet contents. Therefore, it makes no decisions based on packet contents. This command also displays the current size and number of drops for each queue.

The default PVC priority is normal. Apply the map-class to the VC. Use the show frame-relay PVC [dlci] and show queueing interface commands to confirm your configuration change. Optionally, configure the size of each interface queue with the following command.

The default sizes of the high, medium, normal, and low priority queues are 20, 40, 60, and 80 packets, respectively. If you subsequently enable FRF. In addition, PIPQ cannot be enabled if a automated router queue fancy queueing mechanism automated router queue is configured on the interface. PIPQ applies strict priority queuing.

If traffic is continuously dequeued to the high-priority queue, the queueing scheduler will schedule the high-priority queue and may effectively starve lower-priority queues. Therefore, take care in assigning PVCs to the high-priority queue. In other words, interface drivers set unique default TX ring values based on the bandwidth amount. They do not build a separate ring for each VC. Thus, tuning down the TX ring to a value of 2 on low-speed interfaces effectively moves most of the packet buffering to the PVC queue where the fancy queueing mechanisms and QoS service policies do apply.

The following table lists serial port adapters for the 7x00 Series for automatic tuning down of the transmit ring. The size of the automated router queue ring is tuned down automatically when a voice-optimizing feature is enabled. In addition, applying PIPQ causes the transmit ring to be tuned down automatically.

Contents Introduction. Hardware queue automated router queue transmit ring per interface. Layer 3 processor system or interface buffers. High-Speed Serial Port Adapters. Multichannel Serial Port Adapters.

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