Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010, Configuration Manual

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Figure 45: Low-Latency Mode
To configure low-latency mode with a strict-priority queue and a best-effort queue:
1.
Configure the traffic class.
host1(config)# traffic-class strict
host1(config-traffic-class)# exit
2.
Set the traffic class in the traffic-class group.
host1(config)# traffic-class-group strict
host1(config-traffic-class-group)# traffic-class strict
host1(config-traffic-class-group)# exit
3.
Define the scheduler profile for the traffic-class group.
host1(config)# scheduler-profile strict
host1(config-scheduler-profile)# strict-priority
host1(config-scheduler-profile)# exit
4.
Configure the QoS profile with two ATM VC queues.
host1(config)# qos-profile low-latency-q-p
host1(config-qos-profile)# atm-vc node
host1(config-qos-profile)# atm-vc queue traffic-class best-effort
host1(config-qos-profile)# atm group strict scheduler-profile strict
host1(config-qos-profile)# atm-vc queue traffic-class strict
host1(config-qos-profile)# exit
5.
From the desired port, set the QoS port mode to low latency.
host1(config)# interface atm 2/0
host1(config-if)# qos-mode-port low-latency
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Configuring Low-Latency Mode for Per-Port Queuing on ATM Interfaces
JUNOSe 11.1.x Quality of Service Configuration Guide