Overview - Alcatel-Lucent 7450 Quality Of Service Manual

Overview

All queue threshold and queue scheduling parameters are adjusted to the available bundle
rate. If a member link goes down or a new member link is added to the bundle, the scheduling
parameters MIR, W1, W2, W3, as well as the per class queue thresholds OOP and max are
automatically adjusted to maintain the same values.
Class 0 queue is serviced at MLPPP at available bundle rate. Class 1 queue is guaranteed a
minimum service rate but is allowed to share additional bandwidth with class 2 and 3 queues
based on the configuration of WRR weight W1.
Class queues 2 and 3 can be given bandwidth guarantee by limiting MIR of class 1 queue to
less than 100% and by setting the WRR weights W1, W2 and W3 to achieve the desired
bandwidth distribution among all three class queues.
There is one queue per bundle member link to carry link control packets, such as LCP: PPP,
and which are serviced with strict priority over the 4 class queues (not shown).
In the default 2-class, 3-class, and 4-class egress QoS profile, the class queues are service
with strict priority in ascending order of class number.
832
Table 69: MLPPP Class Queue Scheduling Parameters (Continued)
Profile 3
Figure 52: MLPPP Class Queue Scheduling Scheme
Class0 > 100%
Class1 > MIR
yes
Class2
Class3
WRR Parameters
85% <1% 87%
no
RR
no
W1
W2
Wrr
W3
12%
Strict
Priority
al_0193
Quality of Service Guide