Service Or Subscriber Or Multi-Service Site Scheduler Child To Port Scheduler Parent - Alcatel-Lucent 7450 Quality Of Service Manual

Ethernet service switch; service router; extensible routing system

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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.

demonstrates this model.

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

Figure 21: Two Scheduler Policy Model for Access Ports

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