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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

194

3.23.2.3 ACL Policing

Each ACL policer entry contains the fields listed in the following table.

At most, a frame can trigger one ACL policer. ACL policers are enabled by specifying a rate in

ANA_AC_POL:POL_ALL_CFG:POL_ACL_RATE_CFG.ACL_RATE and also enabled by a VCAP IS2 hit.

For more information, see VCAP IS2, page 62.

The policer burst capacity can be specified with 4K granularity

(ANA_AC_POL:POL_ALL_CFG:POL_ACL_THRES_CFG.ACL_THRES).

The following parameters can also be configured per policer.

•

The leaky bucket calculation can be configured to include or exclude preamble, inter-frame gap and

an optional encapsulation (ANA_AC_POL:POL_ALL_CFG:POL_ACL_CTRL.GAP_VALUE).

•

Traffic with DP level below a certain level can be configured to bypass the policers

(ANA_AC_POL:POL_ALL_CFG:POL_ACL_CTRL.DP_BYPASS_LVL).

•

Each policer can be configured to measure frame rates instead of bit rates

(ANA_AC_POL:POL_ALL_CFG:POL_ACL_CTRL.FRAME_RATE_ENA).

•

Each policer can be configured to operate on frames towards CPU and/or front ports

(ANA_AC_POL:POL_ALL_CFG:POL_ACL_CTRL.ACL_TRAFFIC_TYPE_MASK).

Traffic dropped by an ACL policer can be counted in the ACL statistics block and optionally also in the

port statistic block. For more information, see Analyzer Statistics, page 198.

The following ACL policer debug events are available:

•

Bypass of policer due to pipeline handling can be identified

(ANA_AC_POL:POL_ALL_CFG:POL_STICKY.POL_ACL_PT_BYPASS_STICKY).

•

Bypass of policer due to bypass level can be identified

(ANA_AC_POL:POL_ALL_CFG:POL_STICKY.POL_ACL_BYPASS_STICKY).

•

Dropping of traffic due to ACL policer can be identified

(ANA_AC_POL:POL_ALL_CFG:POL_STICKY.POL_ACL_DROP_STICKY).

•

Policers that are active but not closed can be identified

(ANA_AC_POL:POL_ALL_CFG:POL_STICKY.POL_ACL_ACTIVE_STICKY).

For example, to use ACL policers to limit traffic to CPU only, the following configuration is required:

•

Set up a VCAP S2 rule to enable ACL policer 5.

•

Configure ACL policer 5 to only allow 100 frames per second towards CPU: # the rate is 10 times the

configured value ANA_AC_POL:POL_ALL_CFG:POL_ACL_RATE_CFG[5].ACL_RATE = 10

ANA_AC_POL:POL_ALL_CFG:POL_ACL_CTRL[5].FRAME_RATE_ENA = 1

•

Do not accept burst:

ANA_AC_POL:POL_ALL_CFG:POL_ACL_THRES_CFG[5].ACL_THRES = 0

•

Only police traffic towards CPU:

ANA_AC_POL:POL_ALL_CFG:POL_ACL_CTRL[5].ACL_TRAFFIC_TYPE_MASK = 2

Table 123 •

ACL Policer Table Entries

Field

Bits

Description

ACL_TRAFFIC_TYPE_MASK

Configures the traffic types to be taken into account by the policer.

FRAME_RATE_ENA

Configures frame rate mode for the ACLpolicer, where rates are measured

in frames per second instead of bytes per second.

DP_BYPASS_LVL

Controls the lowest DP level that is taken into account. That is, traffic with

DP below this value is ignored and not policed.

GAP_VALUE

Configures the leaky bucket calculation to include or exclude preamble,

inter-frame gap and optional encapsulation through configuration.

ACL_THRES

Configures ACL policer burst capacity.

ACL_RATE

Configures ACL policer rate.

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