Sample Process For Controlling The Simple Shared Shaper Algorithm; Table 9: Rising Edge Sample When Video Flow Starts - Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010 Configuration Manual

Sample Process for Controlling the Simple Shared Shaper Algorithm

The simple shared shaper in this example contains two constituents, best-effort and
video. The shared-shaping rate is 15 Mbps, and the video rate is 4 Mbps.
The example contains two parts: when the video flow is turned on, and then turned
off.
NOTE: The rates in this example are approximate and for illustrative purposes only.
Your configuration might yield different results based on network variables.
Table 9 on page 95 lists the dynamic rate when the video flow is turned on for the
Starting Video Flow
five classes of simple shared shaper variables. Results vary because the amount of
video measured in the first rising period is random, in the range 0–4 Mbps
non-inclusive.

Table 9: Rising Edge Sample When Video Flow Starts

In this example, a liberal maximum VOQL value is ineffective because the 15 Mbps
shared-shaping rate is much higher than the 4 Mbps video rate. The video rate divided
by the shared shaping rate is 26.6 percent, so any value higher than this has no
effect.
NOTE: The rates in this example represent approximate egress-queue enqueue rates
on an Ethernet line module; therefore, there is no ATM SAR or downstream devices
are not used. More liberal configurations can be inappropriate when there might be
queuing between the scheduler and the destination. VLAN queuing is used, and
saturation rates are offered.
Chapter 11: Configuring Variables in the Simple Shared Shaping Algorithm
Period of Dynamic Rate, in Kbps
Control 1 2 3
Most 1 5 0 0 0 13080 11000
liberal
Liberal 1 5 0 0 0 9542 8880
Moderate 1 5 0 0 0 6510 5606
Conservative 1 5 0 0 0 6022 1604
Most – – –
conservative
Sample Process for Controlling the Simple Shared Shaper Algorithm
4 5 6 7
11000 11000 11000 11000
10470 10867 10972 10979
8303 9651 10329 10628
3953 5714 7038 7978
– – – –
8 9 10
11000 11000 11000
10994 10998 10994
10814 10967 10953
8733 9300 9735
– – –
95