Available Bandwidth - Alcatel-Lucent 7450 Quality Of Service Manual

Ethernet service switch; service router; extensible routing system

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A queue is where packets that will be forwarded are buffered before scheduling. Packets are

not actually forwarded through the schedulers; they are forwarded from the queues directly

to ingress or egress interfaces. The association between the queue and the virtual schedulers

is intended to accomplish bandwidth allocation to the queue. Because the offered load is

derived from queue utilization, bandwidth allocation is dependent on the queue distribution

among the scheduler hierarchy. Queues can be tied to only one scheduler within the

The rate defines the maximum bandwidth that will be made available to the scheduler or

queue. The rate is defined in kilobits per second (Kbps).

Root (Scheduler)

A scheduler that has no parent scheduler association (is not a child of another scheduler) is

considered to be a root scheduler. With no parent scheduler, bandwidth utilized by a root

scheduler is dependent on offered load of child members, the maximum rate defined for the

scheduler and total overall available bandwidth. Any scheduler can be a root scheduler. Since

parent associations are not allowed in Tier 1, all schedulers in Tier 1 are considered be a root

On a scheduler, the rate setting is used to limit the total bandwidth allocated to the

scheduler's child members.

For queues, the rate setting is used to define the Peak Information Rate (PIR) at which

the queue can operate.

Quality of Service Guide