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How to configure CBWFQ and LLQ for PPP
Low Latency Queueing (LLQ) is the key prioritization technique for enabling voice and data integration.
To configure Low Latency Queueing (LLQ), perform these steps:
Create a class map for Voice over IP (VoIP) traffic, and define a match criteria.
Create a class map for VoIP signaling, and define a match criteria (optional).
Create a policy map, and associate it to the VoIP class maps.
Enable LLQ by applying the policy map to the outbound WAN interface.
These documents provide useful information on Configuring Class-Based Weighted Fair Queuing (CBWFQ) and LLQ. They also provide a number of other good sources on configuring Quality of Service (QoS) for voice: