Alcatel-Lucent 7450 Quality Of Service Manual page 267

Description This command is used to configure the forwarding plane counters that allow offered, output and
discard accounting to occur for the policer. An ingress policer has multiple types of offered packets
(explicit in-profile, explicit out-of-profile, high priority or low priority) and each of these offered types
is interacting with the policer's metering and profiling functions resulting in colored output packets
(green, yellow and red). Due to the large number of policers, it is not economical to allocate counters
in the forwarding plane for all possible offered packet types and output conditions. Many policers will
not be configured with a CIR profiling rate and not all policers will receive explicitly profiled offered
packets. The stat-mode command allows provisioning of the number of counters each policer requires
and how the offered packet types and output conditions should be mapped to the counters.
While a no-stats mode is supported which prevents any packet accounting, the use of the policer's
parent command requires at the policer's stat-mode to be set at least to the minimal setting so that
offered stats are available for the policer's Fair Information Rate (FIR) to be calculated. Once a policer
has been made a child to a parent policer, the stat-mode cannot be changed to no-stats unless the
policer parenting is first removed.
Each time the policer's stat-mode is changed, any previous counter values are lost and any new
counters are set to zero.
Each mode uses a certain number of counters per policer instance that are allocated from the
forwarding plane's policer counter resources. You can view the the total/allocated/free stats by using
the tools dump resource-usage card fp command. If insufficient counters exist to implement a mode
on any policer instance, the stat-mode change will fail and the previous mode will continue unaffected
for all instances of the policer.
The default stat-mode when a policer is created within the policy is minimal.
The stat-mode setting defined for the policer in the QoS policy may be overridden on an sla-profile
or SAP where the policy is applied. If insufficient policer counter resources exist to implement the
override, the stat-mode override command will fail. The previous stat-mode setting active for the
policer will continue to be used by the policer.
The no form of this command attempts to return the policer's stat-mode setting to minimal. The
command will fail if insufficient policer counter resources exist to implement minimal where the QoS
policer is currently applied and has a forwarding class mapping.
Parameters no-stats — Counter resource allocation: 0
Quality of Service Guide
The policer does not have any forwarding plane counters allocated and cannot provide
offered, discard and forward statistics. A policer using no-stats cannot be a child to a parent
policer and the policer's parent command will fail.
When collect-stats is enabled, the lack of counters causes the system to generate the
following statistics:
a. offered-in = 0
b. offered-out = 0
c.'discard-in = 0
d. discard-out = 0
e. forward-in =0
f. forward-out = 0
Service Egress and Ingress QoS Policies
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