4RF Aprisa XE, Руководство пользователя

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Configuring the traffic interfaces | 83
4.
Select the Priority Queue Scheduling.
There are two methods for transmitting the Ethernet traffic queues across the link:
ƒ Strict: the queue is transmitted based on the priority. The first queue transmitted is the highest
priority queue and the terminal will not transmit any other traffic from any other queue until the
highest priority queue is empty. Then the next highest priority queue is transmitted, and so on.
ƒ Weighted (default): each of the queues will transmit a number of packets based on a
weighting. The following table shows how the weighting is applied to each queue.
Queue Priority Number of packets transmitted
Queue 3 Highest Priority 8 packets
Queue 2 4 packets
Queue 1 2 packets
Queue 0 Lowest Priority 1 packets
5. Select the IEEE 802.1 Priority Queue Mapping.
This determines the standard (or scheme) used for prioritizing traffic into one of four queues
numbered 0 to 3 (3 being the highest priority queue).
There are two possible methods for queuing the ethernet traffic. One is based on the IEEE 802.1D
standard (which is the default setting), and the other is based on the Cisco-proprietary method.
The following table shows how traffic is queued using the two methods:
Output Queue
Priority Traffic Type Cisco
Priority Queuing
IEEE 802.1D
Priority Queuing
0 (default) Best Effort 0 1
1 Background 0 0
2 Spare 1 0
3 Excellent Effort 1 1
4 Controlled Load 2 2
5 ‘Video’ < 100ms latency and jitter 2 2
6 ‘Video’ < 10ms latency and jitter 3 3
7 Network Control 3 3