Users Guide

● test cam-usage service-policy input policy-map {stack-unit } number port-set number
● test cam-usage service-policy input policy-map {stack-unit } all
The output of this command, shown in the following example, displays:
● The estimated number of CAM entries the policy-map will consume.
● Whether or not the policy-map can be applied.
● The number of interfaces in a port-pipe to which the policy-map can be applied.
Specifically:
● Available CAM — the available number of CAM entries in the specified CAM partition for the specified line card or stack-
unit port-pipe.
● Estimated CAM — the estimated number of CAM entries that the policy will consume when it is applied to an interface.
● Status — indicates whether the specified policy-map can be completely applied to an interface in the port-pipe.
○ Allowed — indicates that the policy-map can be applied because the estimated number of CAM entries is less or equal
to the available number of CAM entries. The number of interfaces in the port-pipe to which the policy-map can be
applied is given in parentheses.
○ Exception — indicates that the number of CAM entries required to write the policy-map to the CAM is greater than the
number of available CAM entries, and therefore the policy-map cannot be applied to an interface in the specified port-
pipe.
NOTE: The show cam-usage command provides much of the same information as the test cam-usage command, but
whether a policy-map can be successfully applied to an interface cannot be determined without first measuring how many
CAM entries the policy-map would consume; the test cam-usage command is useful because it provides this
measurement.
● Verify that there are enough available CAM entries.
test cam-usage
DellEMC# test cam-usage service-policy input pmap_l2 port-set 0 | port pipe
Port-pipe | CAM Partition | Available CAM | Estimated CAM | Status
=====================================================================
0 L2ACL 500 200 Allowed(2)
Specifying Policy-Based Rate Shaping in Packets Per
Second
You can configure the rate shaping in packets per second (pps) for QoS output policies.
You can configure rate shaping in pps for a QoS output policy, apart from specifying the rate shaping value in bytes. You can
also configure the peak rate and the committed rate for packets in kilobits per second (Kbps) or pps.
Committed rate refers to the guaranteed bandwidth for traffic entering or leaving the interface under normal network
conditions. When traffic propagates at an average rate that is less than or equal to the committed rate, it is considered to be
green-colored or coded. When the transmitted traffic falls below the committed rate, the bandwidth, which is not used by any
traffic that is traversing the network, is aggregated to form the committed burst size. Traffic is considered to be green-colored
up to the point at which the unused bandwidth does not exceed the committed burst size.
Peak rate refers to the maximum rate for traffic arriving or exiting an interface under normal traffic conditions. Peak burst size
indicates the maximum size of unused peak bandwidth that is aggregated. This aggregated bandwidth enables brief durations of
burst traffic that exceeds the peak rate and committed burst.
In releases of Dell EMC Networking OS earlier than Release 9.3(0.0), you can configure only the maximum shaping attributes,
such as the peak rate and the peak burst settings. You can now specify the committed or minimum burst and committed rate
attributes. The committed burst and committed rate values can be defined either in bytes or pps.
You can use the rate-shape pps peak-rate burst-packets command in the QoS Policy Out Configuration mode to
configure the peak rate and burst size as a measure of pps. Alternatively, you can use the rate shape kbps peak-rate
burst-KB command to configure the peak rate and peak burst size as a measure of bytes.
Similarly, you can use the rate-shape pps peak-rate burst-packets committed pps committed-rate
burst-packets command in the QoS Policy Out Configuration mode to configure the committed rate and committed burst
706
Quality of Service (QoS)