Qos Policies - Alcatel-Lucent 7950 Quality Of Service Manual

QoS Policies

Service ingress, service egress, and network QoS policies are defined with a scope of either
template or exclusive. Template policies can be applied to multiple SAPs or IP interfaces, whereas,
exclusive policies can only be applied to a single entity.
On most systems, the number of configurable SAP ingress and egress QOS policies per system is
larger than the maximum number that can be applied per FP. The tools dump system-resources
output displays the actual number of policies applied on a given FP (noting that the default SAP
ingress policy is always applied once for internal use). The show qos sap-ingress and show qos
sap-egress commands can be used to show the number of polices configured.
One service ingress QoS policy and one service egress QoS policy can be applied to a specific
SAP. One network QoS policy can be applied to a specific IP interface. A network QoS policy
defines both ingress and egress behavior.
Router QoS policies are applied on service ingress, service egress, and network interfaces and
define:
Classification rules for how traffic is mapped to queues
•
•
•
There are several types of QoS policies:
•
•
•
•
•
Service ingress QoS policies are applied to the customer-facing Service Access Points (SAPs) and
map traffic to forwarding class queues on ingress. The mapping of traffic to queues can be based
on combinations of customer QoS marking (IEEE 802.1p bits, DSCP, and TOS precedence), IP
and MAC criteria. The characteristics of the forwarding class queues are defined within the policy
as to the number of forwarding class queues for unicast traffic and the queue characteristics. There
can be up to eight (8) unicast forwarding class queues in the policy; one for each forwarding class.
A service ingress QoS policy also defines up to three (3) queues per forwarding class to be used
for multipoint traffic for multipoint services. In the case of the VPLS, four types of forwarding are
supported (which is not to be confused with forwarding classes); unicast, multicast, broadcast, and
7950 XRS Quality of Service Guide
The number of forwarding class queues
The queue parameters used for policing, shaping, and buffer allocation
QoS marking/interpretation
Service ingress
Service egress
Network (for ingress and egress)
Network queue (for ingress and egress)
Slope
QoS Policies
Page 21