R3303-HP HSR6800 Routers ACL and QoS Configuration Guide

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• Match packets with priority classes in the configuration order.
• Match packets with other classes in the configuration order.
• Match packets with classification rules in a class in the configuration order.
RTP priority queuing
Real-time transport protocol (RTP) priority queuing is a simple queuing technique designed to guarantee
QoS for real-time services (including voice and video services). It assigns RTP voice or video packets to
high-priority queues for preferential sending, minimizing delay and jitter and ensuring QoS for voice or
video services sensitive to delay.
Figure 21 RTP queuing
As shown in Figure 21, RTP priority queuing assigns RTP packets to a high-priority queue. An RTP packet
is a UDP packet with an even destination port number in a configurable range. RTP priority queuing can
be used in conjunction with any queuing (such as, FIFO, PQ, CQ, WFQ, and CBQ), and it always has
the highest priority.
Do not use RTP priority queuing in conjunction with CBQ. LLQ of CBQ can also guarantee real-time
service data transmission.
Congestion management technique comparison
Breaking through the single congestion management policy of FIFO for traditional IP devices, the device
provides all the congestion management techniques described above to offer powerful QoS capabilities,
meeting different QoS requirements of different applications.
Packets to be sent
through this interface
Classify
RTP queue
Other queuing
mechanisms, such as
PQ, CQ and WFQ
Dequeue
preferentially
Schedule
Packets sent
Sending
queue
Interface