Alcatel-Lucent 7450 - Service or Subscriber or Multi-Service Site Scheduler Child to Port Scheduler Parent

Overview
510 Quality of Service Guide
Service or Subscriber or Multi-service site Scheduler Child to Port
Scheduler Parent
The service or subscriber or multi-service site scheduler to port scheduler association model
allows for multiple services or subscriber or multi-service site to have independent scheduler
policy definitions while the independent schedulers receive bandwidth from the scheduler at
the port level. By using two scheduler policies, available egress port bandwidth can be
allocated fairly or unfairly depending on the desired behavior. Figure 21 graphically
demonstrates this model.
Figure 21: Two Scheduler Policy Model for Access Ports
Once a two scheduler policy model is defined, the bandwidth distribution hierarchy allocates
the available port bandwidth to the port schedulers based on priority, weights, and rate limits.
The service or subscriber or multi-service site level schedulers and the queues they service
become an extension of this hierarchy.
Due to the nature of the two scheduler policy, bandwidth is allocated on a per-service or per
subscriber or multi-service site basis as opposed to a per-class basis. A common use of the
two policy model is for a carrier-of-carriers mode of business. In essence, the goal of a carrier
is to provide segments of bandwidth to providers who purchase that bandwidth as services.
While the carrier does not concern itself with the interior services of the provider, it does
however care how congestion affects the bandwidth allocation to each provider’s service. As
an added benefit, the two policy approach provides the carrier with the ability to
OSSG131
SAP or MSS
Port
Strict/
Weighted
Rate Limiting
Scheduler
Queue
Queue
Queue
Queue
Queue
Queue
Strict/
Weighted
Rate Limiting
Scheduler
Strict/
Weighted
Rate Limiting
Scheduler
Strict/
Weighted
Rate Limiting
Scheduler
Strict/
Weighted
Rate Limiting
Scheduler
Priority 1
Weighted
Rate Limiting
Scheduler
Priority 2
Weighted
Rate Limiting
Scheduler
Port
Strict Rate
Limiting
Scheduler
Priority n
Weighted
Rate Limiting
Scheduler