Voice and video services are no smooth when MP services are deployed on the AR router

When MP services are deployed, QoS LLQ queues are often used in the uplink and special flows enter LLQ queues. Low delay and packet loss ratio are ensured for LLQ queues that voice services enter.
To ensure that voice and video services are rapidly and smoothly transmitted, enable LFI on the MP-group interface.
Run the ppp mp lfi command in the MP-group interface view.

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