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

Page: 176 / 398

subscribers without oversubscription. Call admission control ensures that there
are no more than 20 simultaneous voice service subscribers. Unused bandwidth
is divided among the video and best-effort users.
■
The video service is scheduled by the HRR scheduler and gets the hierarchical
assured rate. You shape the video traffic to 50 Mbps. Each video service user is
assured 1 Mbps, and is shaped to 1 Mbps to support up to 50 video subscribers
without oversubscription. Call admission control ensures that there are no more
than 50 simultaneous video service subscribers. Unused bandwidth is divided
among the best-effort users.
■
The best-effort data service is scheduled by the HRR scheduler and gets the
bandwidth left over from the voice and video services.
Configure this implementation as follows.
1.
Create the video and voice traffic classes. Assign the voice traffic class a
strict-priority treatment within the fabric. Manually creating a best-effort traffic
class is superfluous because the router creates this class by default.
(config)# traffic-class video
(config-traffic-class)# exit
(config)# traffic-class voice
(config-traffic-class)# fabric-strict-priority
(config-traffic-class)# exit
(config)# traffic-class best-effort
(config-traffic-class)# exit
2.
Create scheduler profiles for the assured forwarding, expedited forwarding, and
best-effort groups. Specify strict priority scheduling for the expedited forwarding
traffic and shape it to 20 Mbps.
(config)# scheduler-profile expeditedGroup
(config-scheduler-profile)# strict-priority
(config-scheduler-profile)# shaping-rate 20000000
(config-scheduler-profile)# assured-rate 20000000
(config-scheduler-profile)# exit
3.
Assured traffic is not strict, so it is scheduled by the HRR scheduler. Shape the
assured traffic to 50 Mbps, and specify the hierarchical assured rate to give
assured traffic preferential treatment over best-effort traffic.
(config)# scheduler-profile assuredGroup
(config-scheduler-profile)# shaping-rate 50000000
(config-scheduler-profile)# assured-rate hierarchical
(config-scheduler-profile)# exit
4.
Best effort traffic is also scheduled by the HRR scheduler. You do not apply any
shaping for this traffic because it simply gets the leftover bandwidth.
(config)# scheduler-profile bestEffortGroup
(config-scheduler-profile)# exit
5.
Create scheduler profiles for the voice, video, and best-effort service classes.
Shape voice and video to 1 Mbps. Because you do not specify a shaping rate,
the best-effort traffic can borrow unused bandwidth.
144 ■
Example: Diffserv Configuration with Multiple Traffic-Class Groups
JUNOSe 11.1.x Quality of Service Configuration Guide