Alcatel-Lucent 7950 Quality Of Service Manual page 448

Egress Port-Based Schedulers
Direct Service or Queue Association to Port Scheduler Parents
The second model of bandwidth allocation on an egress access port is to directly associate a
service
allocate bandwidth on a per class or priority basis to each service
provider to manage the available egress port bandwidth on a service tier basis ensuring that during
egress port congestion, a deterministic behavior is possible from an aggregate perspective. While
this provides an aggregate bandwidth allocation model, it does not inhibit per service or per
queuing.
Figure 18
level. The aggregate rate limiter is used to define a maximum aggregate bandwidth at which the
child queues can operate. While the port-level scheduler is allocating bandwidth to each child
queue, the current sum of the bandwidth for the service
limit is reached, no more bandwidth is allocated to the children associated with the SAP, multi-
service site,
mutually exclusive to defining SAP, multi-service site,
The benefit of the single scheduler policy model is that the bandwidth is allocated per priority for
all queues associated with the egress port. This allows a provider to preferentially allocate
bandwidth to higher priority classes of service independent of service
Page 448
queue to a port-level scheduler. This model allows the port scheduler hierarchy to
or
Figure 18 demonstrates the single, port scheduler policy model.
also demonstrates the optional aggregate rate limiter at the SAP, multi-service site
. Aggregate rate limiting is restricted to the single scheduler policy model and is
or
queue. This allows the
or
is monitored. Once the aggregate rate
or
scheduling policies.
or
or
7950 XRS Quality of Service Guide
or
instance.