Congestion Monitoring On Egress Port Scheduler - Alcatel-Lucent 7450 Quality Of Service Manual

Overview
The above-CIR weight = 0 value is only used for orphaned queues and schedulers on port
scheduler enabled egress ports. The system interprets weight=0 as priority level 0 and will
only distribute bandwidth to level 0 once all other properly parented queues and schedulers
have received bandwidth. Orphaned queues and schedulers all have equal priority to the
remaining port bandwidth.
The default orphan behavior can be overridden for each port scheduler policy by using the
orphan override command. The orphan override command accepts the same parameters as the
port parent command. When the orphan override command is executed, all orphan queues
and schedulers are treated in a similar fashion as other properly parented queues and
schedulers based on the override parenting parameters.
It is expected that an orphan condition is not the desired state for a queue or scheduler and is
the result of a temporary configuration change or configuration error.

Congestion Monitoring on Egress Port Scheduler

A typical example of congestion monitoring on an Egress Port Scheduler (EPS) is when the
EPS is configured within a Vport. A Vport is a construct in an HQoS hierarchy that can be
used to control the bandwidth associated with an access network element (such as, GPON
port, OLT, DSLAM) or a retailer that has subscribers on an access node (among other
retailers).
The example in
planning purposes, it's necessary to know if the GPON ports (Vports) are congested.
Frequent and prolonged congestion on the Vport will prompt the operator to increase the
offered bandwidth to its subscribers by allocating additional GPON ports and subsequently
moving the subscribers to the newly allocated GPON ports.
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• Within-CIR weight = 0
• Above-CIR priority = 1
• Above-CIR weight = 0
Figure 27 shows Vports representing GPON ports on an OLT. For capacity
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