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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

193

3.23.2.2 BUM Policing

Each entry in the BUM single leaky bucket table contains the following fields.

The BUM policers are indexed through the VLAN table (ANA_L3:VLAN:BUM_CFG.BUM_SLB_IDX). This

indexing can be overruled for services through the ISDX table

(ANA_L2:ISDX:MISC_CFG.BUM_SLB_IDX and ANA_L2:ISDX:MISC_CFG.BUM_SLB_ENA).

Each BUM policer contains three leaky buckets. Rates and thresholds are configured through

ANA_AC_POL:BUM_SLB:LB_CFG).

Traffic for the three BUM leaky buckets is configurable in

ANA_AC_POL:COMMON_BUM_SLB:TRAFFIC_MASK_CFG. This provides a flexible allocation of traffic

for the policers. For example, it is possible to have BUM configured as:

•

Leaky bucket 0: Broadcast traffic

(ANA_AC_POL:COMMON_BUM_SLB:TRAFFIC_MASK_CFG[0].TRAFFIC_TYPE_MASK = 1)

•

Leaky bucket 1: Unknown unicast traffic

(ANA_AC_POL:COMMON_BUM_SLB:TRAFFIC_MASK_CFG[1].TRAFFIC_TYPE_MASK = 4)

•

Leaky bucket 2: Unknown multicast traffic

(ANA_AC_POL:COMMON_BUM_SLB:TRAFFIC_MASK_CFG[2]. TRAFFIC_TYPE_MASK = 2)

BUM policers can be configured as frame-based policers

(ANA_AC_POL:BUM_SLB:MISC_CFG.FRAME_RATE_ENA).

The BUM statistics count on the following events (configured through

ANA_AC:STAT_GLOBAL_CFG_BUM:STAT_GLOBAL_EVENT_MASK):

•

Bit 0: Count Broadcast traffic discarded by BUM policer

•

Bit 1: Count Multicast traffic discarded by BUM policer

•

Bit 2: Count Unicast traffic discarded by BUM policer

•

Bit 3: Count Broadcast traffic applicable for BUM policer, but not discarded

•

Bit 4: Count Multicast traffic applicable for BUM policer, but not discarded

•

Bit 5: Count Unicast traffic applicable for BUM policer, but not discarded.

Table 122 •

BUM Single Leaky Bucket Table Entries

Field

Bits

Description

ANA_AC_POL:BUM_SLB:SLB_CFG.TIMESCALE_VAL

Configures policer rate granularity.

ANA_AC_POL:BUM_SLB:SLB_CFG.CIR_INC_DP_VAL 2

Controls how much drop precedence (DP) is

incremented for excess traffic.

ANA_AC_POL:BUM_SLB:SLB_CFG.GAP_VAL

Configures the leaky bucket calculation to

include or exclude preamble, inter-frame gap

and optional encapsulation through

configuration.

ANA_AC_POL:BUM_SLB:LB_CFG[2:0].THRES_VAL

3 x 7

Configures burst size.

ANA_AC_POL:BUM_SLB:LB_CFG[2:0].RATE_VAL

3 x 11

Configures rate.

ANA_AC_POL:BUM_SLB:SLB_CFG.ENCAP_DATA_DIS 1

Configures if stripped encapsulation data

(normalized data) is policed by the policer.

ANA_AC_POL:BUM_SLB:MISC_CFG.FRAME_RATE_E

Configures frame rate operation.

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