Example: Compound Shared Shaping For Atm Vps; Figure 28: Vp Compound Shared Shaping Example - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - QUALITY OF SERVICE CONFIGURATION GUIDE 2010-09-22 Configuration Manual

JunosE 11.3.x Quality of Service Configuration Guide
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Example: Compound Shared Shaping for ATM VPs

Figure 28: VP Compound Shared Shaping Example

100
Configuring Compound Shared Shaping on page 96
Compound Shared Shaping Overview on page 95
Figure 28 on page 100 shows a compound shared shaper for a VP interface. VP shared
shaping enables a shared shaper to apply to all the aggregate rates of all VCs within the
VP.
In this example, the VP is shaped to a compound shared rate of 5 Mbps. The voice traffic
gets strict priority scheduling for up to 400 Kbps of the shared rate on the VP. The video
traffic gets up to 2 Mbps of the remaining 4.6–5 Mbps on the VP. Finally, the data traffic
has the last claim to the remaining 2.6–3 Mbps of shared VP bandwidth.
This configuration enables data traffic to flow at 2.6 Mbps when voice and video are both
using their limit. When both voice and video are quiescent, data can flow at the full 5
Mbps shared rate.
The QoS profile used in this example is appropriate for low-CDV mode. If the provider
configures a shapeless VP tunnel in the SAR, QoS sets the SAR shaper for the VP to
match the 5 Mbps shared-shaping rate, and the CDV is bounded for the VP tunnel.
VP-level queuing does not guarantee fairness to the voice and video for each VC.
To configure VP compound shared shaping:
Configure the traffic classes, traffic-class groups, and additional scheduler profiles.
1.
Configure the scheduler profile that defines the shared shaper and the profiles that
2.
apply the legacy shaper.
Copyright © 2010, Juniper Networks, Inc.