Alcatel-Lucent 7950 Quality Of Service Manual page 147

Egress Criteria Classification Directly to Policer
It is possible to classify traffic directly to a policer, independent of the policer/queue assigned to
the traffic's forwarding class. This is supported at SAP egress by configuring a policer in the
action statement within an ip-criteria or ipv6-criteria statement.
The policed traffic by default exits through one of the following methods:
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•
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The number of configuration combinations of a policer and one of the above methods is capped at
63 within a given SAP egress QoS policy. For two or more definitions to be counted as a single
combination, their action statement must have the same policer ID with the same queue ID (if one
is specified), or with the same port-redirect-queue-group (if one is specified), or with the
parameter use-fc-mapped-queues (if specified). The forwarding class and profile used are
irrelevant when considering the number of combinations. For example, it is possible to configure
32 policers with traffic exiting queue 1 but then, only 31 of the same policers are exiting queue 2;
this would use all 63 combinations.
This is supported on all FP2- and higher-based hardware, excluding when a HS-MDA is used.
QPPB processing takes precedence over this feature.
This could be used, for example, when it is required that egress traffic with a DSCP value EF is to
be policed instead of shaped in a queue on a given SAP. The traffic could be classified based on its
DSCP value and directed to policer 1 while the remainder of the customer's traffic is processed
using egress queue 1. This is shown jn
7950 XRS Quality of Service Guide
A queue in the policer-output-queues queue group that is automatically created on an
access or hybrid port with the queue used that was chosen by the forwarding class
definition in that queue group. If the forwarding class is modified in the action statement
then the new forwarding class selects the queue to be used.
A specific queue in a user configured queue group. For SAP egress, this requires the use
of the port-redirect-queue-group queue parameter in the criteria action statement with
the queue group name being specified when the egress QoS policy is applied to the SAP.
For subscribers, the queue group to be used is selected using the inter-dest-id associated
with the subscriber and configured as the host-match dest under the port access queue
group configuration.
A SAP queue configured within the SAP egress QoS policy.
The queue to which the forwarding class for the traffic is mapped. This could be a queue
group, SAP, or subscriber queue. This requires the use of the use-fc-mapped-queue
parameter in the criteria action statement. If the forwarding class is modified in the action
statement then new forwarding class selects the queue to be used.
Service Egress and Ingress QoS Policies
Figure 12.
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