Which measures does the AR provide to ensure that packets matching user-defined traffic classifiers are preferentially processed

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AR series routers provide the following measures:

-Assured forwarding (AF): AF ensures the low probability of dropping packets when the rate of outgoing service traffic does not exceed the minimum bandwidth. It is used for services with heavy traffic that need to be ensured.

-Expedited forwarding (EF): EF is used for services that require low delay, low drop probability, ensured bandwidth, and occupying low bandwidth, for example, voice packets.

In addition to common EF queues, the device provides a special EF queue, LLQ queue with the shortest delay. LLQ provides good QoS assurance for delay-sensitive services such as VoIP services.

-Best effort (BE): AR series routers allocate the remaining bandwidth that is not used by EF and AF queues to BE queues.

Other related questions:
How does an AR send packets with high DSCP value to high-priority queues?
In a traffic classifier, configure the AR to send packets with the high DSCP value to EF queues so that the packets are preferentially processed. For example, configure the AR to send packets with the DSCP value of 22 to EF queues. [Huawei] traffic classifier c1 [Huawei-classifier-c1] if-match dscp 22 [Huawei-classifier-c1] quit [Huawei] traffic behavior b1 [Huawei-behavior-b1] queue ef bandwidth 100 cbs 2500 [Huawei-behavior-b1] quit [Huawei] traffic policy p1 [Huawei-trafficpolicy-p1] classifier c1 behavior b1

Matching order of packets when multiple pairs of traffic classifiers and traffic behaviors are defined in a traffic policy
For S series switches (except the S1700): For X series cards of modular switches, the matching order depends on priorities of traffic classifiers, that is, the value of the precedence precedence-value parameter in the traffic classifier command. A smaller value indicates a higher priority. For cards of modular switches except X series cards: - config: The matching order depends on priorities of traffic classifiers, that is, the value of the precedence precedence-value parameter in the traffic classifier command. A smaller value indicates a higher priority. - auto: The matching order depends on priorities of traffic classifier types predefined on the system. The traffic classifiers based on the following information are in descending order of priority: Layer 2 and Layer 3 information, advanced ACL6 rule, basic ACL6 rule, Layer 2 information, Layer 3 information, and user-defined ACL rule. If actions in traffic behaviors do not conflict, all the matching traffic classifiers and traffic behaviors take effect. If actions in traffic behaviors conflict, the traffic classifier and traffic behavior with the highest priority of traffic classifier type takes effect. For S series fixed switches S600-E, packets match traffic classifiers and traffic behaviors according to the sequence in which the traffic classifiers and traffic behaviors are configured. If the first traffic classifier is not matched, the switch matches packets with the second traffic classifier, and so on. If the packets match a traffic classifier, the switch does not match the packets with subsequent traffic classifiers. Only the first pair of the matching traffic classifier and traffic behavior takes effect. For S series modular switches, you can specify the matching order of rules in the traffic policy when creating a traffic policy. The matching orders are classified into the configuration order (config) and automatic order (auto). For other fixed switches, see "How Does the Switch Match Packets When Multiple Pairs of Traffic Classifiers and Traffic Behaviors Are Defined in a Traffic Policy?" in FAQ-QoS.

Can a traffic classifier on an AR be used to match the packet length
A traffic classifier on an AR cannot be used to match the packet length.

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