Classifying Priority Traffic
The traffic placed into the priority queue under LLQ is determined by the same
criteria available to any other user-defined class under CBWFQ. Specifically,
these criteria include protocol,ACLs, IP precedence, and input interface.As mentioned
in Table 8.3, IP Precedence 5 is generally used for Voice traffic.The most
common way to determine which traffic goes into the LLQ is to match the IP
Precedence, since many devices (including Cisco IP Phones) automatically set the
IP Precedence to 5 on Voice traffic.