Network Queue Parent Scheduler - Alcatel-Lucent 7450 Quality Of Service Manual

Network Queue Parent Scheduler

Network queues support port scheduler parent priority-level associations. Using a port
scheduler policy definition and mapping network queues to a port parent priority level, HQoS
functionality is supported providing eight levels of strict priority and weights within the same
priority. A network queue's bandwidth is allocated using the "within-cir" and "above-cir"
scheme normal for port schedulers.
Queue CIR and PIR percentages when port-based schedulers are in effect will be based on
frame-offered-load calculations.
bandwidth distribution.
A network queue with a port parent association exists on a port without a scheduler policy
defined will be considered to be orphaned.
Figure 26: Bandwidth Distribution on Network Port with Port-Based Scheduling
(Packet Provisioned)
Queue
Foster Parent Behavior for Orphaned Queues and Schedulers
All queues and schedulers on a port that has a port-based scheduler policy configured will be
subject to bandwidth allocation through the port-based schedulers. All queues and schedulers
that are not configured with a scheduler parent are considered to be orphaned when port-
based scheduling is in effect. This includes access and network queue schedulers at the SAP,
multi-service site, subscriber and port level.
By default, orphaned queues and schedulers are allocated bandwidth after all queues and
schedulers in the parented hierarchy have had bandwidth allocated "within-cir" and "above-
cir". In essence, an orphaned scheduler or queue can be considered as being foster parented
by the port scheduler. Orphaned queues and schedulers have an inherent port scheduler
association as shown below:
Quality of Service Guide
Network
Queue
(Frame Provisioned)
Highest
Lowest
• Within-CIR priority = 1
Figure 26 demonstrates port-based virtual scheduling
Rate Limiting
Port Priority
Level
(Frame Provisioned)
Highest
Weighted
Rate Limiting
Scheduler
Lowest
QoS Scheduler Policies
Rate Limiting
Port Scheduler
Egress
Strict
Network
Priority
Port
Rate Limiting
Scheduler
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