Alcatel-Lucent 7450 Quality Of Service Manual page 55

For accounting purposes, per-service statistics can be logged. When statistics from service
ingress queues are compared with service egress queues, the ability to conform to per-service
QoS requirements within the service core can be measured. The service core statistics are a
major asset to core provisioning tools.
Service egress QoS policies define egress queues and map forwarding class flows to queues.
In the simplest service egress QoS policy, all forwarding classes are treated like a single flow
and mapped to a single queue. To define a basic egress QoS policy, the following are
required:
Optional service egress QoS policy elements include:
Each queue in a policy is associated with one of the forwarding classes. Each queue can have
its individual queue parameters allowing individual rate shaping of the forwarding class(es)
mapped to the queue.
More complex service queuing models are supported in the router where each forwarding
class is associated with a dedicated queue.
The forwarding class determination per service egress packet is determined either at ingress
or egress. If the packet ingressed the service on the same router, the service ingress
classification rules determine the forwarding class of the packet. If the packet is received on
a network interface, the forwarding class is marked in the tunnel transport encapsulation. In
each case, the packet can be reclassified into a different forwarding class at service egress.
Service egress QoS policy ID 1 is reserved as the default service egress policy. The default
policy cannot be deleted or changed. The default access egress policy is applied to all SAPs
service egress policy explicitly assigned. The characteristics of the default policy are listed in
the following table.
Characteristic
Queues
Quality of Service Guide
• A unique service egress QoS policy ID
• A QoS policy scope of template or exclusive
• At least one defined default queue
• Additional queues up to a total of 8 separate queues (unicast)
• Dot1p/DE, DSCP and prec remarking based on forwarding class
Table 13: Default Service Egress Policy ID 1 Definition
Item Definition
Queue 1 1 (one) queue defined for all traffic classes:
•
•
•
CIR = 0
PIR = max (line rate)
MBS and CBS = default
QoS Policies
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