On a Cisco 827 router, Low Latency Queuing (LLQ) is functional on a dialer interface only with the ppp multilink command issued. Enable the ppp multilink command if a service provider does not support it.
In this case, the service-policy command can be issued but it has no affect. Issue the show policy interface dialer command to show all traffic passing through the default queue.
Issue the service-policy command to the ATM Virtual Circuit (VC) as shown in this configuration example:
interface ATM0.4 point-to-point
vbr-nrt 128 128
!--- Optimise the hardware transmit (Tx) buffer for LLQ.For more information,
Note: Due to the nature of the LLQ implementation on ATM, if an Unspecified Bit Rate (UBR) class is required then the bandwidth (policy-map-class) command must specify a percentage of the bandwidth. If a bandwidth value is preferred or required, then another VC class, such as VBR-nrt, must be chosen. In this case, arbitrarily large Peak Cell Rate (PCR) and Sustainable Cell Rate (SCR) values can be chosen to emulate the UBR class.
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