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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

114

the aggregation group. As a result, all but one member port must be removed from the destination port

set.

The link aggregation code generated in the classifier is used to look up an aggregation mask in the

aggregation masks table. Finally, ports that are cleared in the selected aggregation mask are removed

from DEST.

For more information about link aggregation, see Link Aggregation, page 246.

3.9.3.4

VCAP Action Handling

VCAP IS2 actions are processed during the VCAP IS2 action handling step. The following table lists the

processing of the VCAP actions. The order of processing is from top to bottom.

3.9.3.5

SMAC Analysis

During the SMAC analysis step, the MAC table is searched for a match against the (SMAC, VID), and the

MAC table is updated due to learning. Either the B-MAC table or the C-MAC table is searched. The

learning part is skipped if the LRN_DIS flag was set by any of the previous steps.

The following table lists the registers associated with SMAC learning.

Table 88 •

VCAP IS2 Action Processing

IS2 Action Field

Description

CPU_COPY_ENA

CPU_QU_NUM

If CPU_COPY_ENA is set, the CPU_QU_NUM bit is set in CPUQ.

HIT_ME_ONCE

CPU_QU_NUM

If HIT_ME_ONCE is set and the HIT_CNT counter is zero, the

CPU_QU_NUM bit is set in CPUQ.

LRN_DIS

If set, learning is disabled (LRN_DIS flag is set).

POLICE_ENA

POLICE_IDX

If POLICE_ENA is set (only applies to first lookup), the POLICE_IDX

instructs which policer to use for this frame. See Policers, page 118.

POLICE_VCAP_ONLY If POLICE_VCAP_ONLY is set (only applies to first lookup), the only active

policer for this frame is the VCAP policer. Other policers (QoS, port) are

disabled. See Policers, page 118.

MASK_MODE

PORT_MASK

The following actions are defined for MASK_MODE.

0: No action.

1: Permit. Ports cleared in PORT_MASK are removed from DEST.

2: Policy. DEST from the DMAC analysis step is replaced with

PORT_MASK.

3: Redirect. DEST as the outcome of the DMAC, VLAN, service, and

aggregation analysis steps is replaced with PORT_MASK.

MIRROR_ENA

If MIRROR_ENA is set, mirroring is enabled. This is used in the mirroring

step. See Mirroring, page 117.

Table 89 •

SMAC Learning Registers

Description

Replication

PORT_CFG.LEARN_ENA

If cleared for PPORT, learning is skipped (that is,

LEARNAUTO, LEARNCPU, LEARNDROP,

LIMIT_CPU, LIMIT_DROP,

LOCKED_PORTMOVE_CPU, and

LOCKED_PORTMOVE_DROP are ignored).

Per port

PORT_CFG.LEARNAUTO

If set for PPORT, hardware-based learning is

performed.

Per port

PORT_CFG.LEARNCPU

If set for PPORT, learn frames are copied to the

CPU.

Per port

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