Port Features
Page 64 7750 SR Interface Configuration Guide
Table 12 and Figure 10 provide the details of the class queue scheduling parameters.
Figure 10: MLPPP Class Queue Scheduling Scheme
Note that 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.
Note that 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).
Table 12: MLPPP Class Queue Scheduling Parameters
WRR Parameters
4-class MLPPP
Egress QoS Profile
MIRW1W2W3
Profile 1 85% <1% 66% 33%
Profile 2 90% <1% 89% 10%
Profile 3 85% <1% 87% 12%
OSSG259
Class0
> 100%
No
RR
Strict
Priority
Class1
> MIR
No
Yes
wrr
Class2
W2
W1
Class3
W3
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