VSC7440 datasheet(205/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

188

3.23.1.2 Source Lookup

This section describes how to configure source port filtering. The following table lists the applicable

registers.

Source port filtering for each ingress port can be configured to ensure that frames are not bridged back to

the port it was received on (ANA_AC:SRC[0-14]:SRC_CFG).

Ports part of a link aggregation group (LAG) are configured with identical source masks, with all member

ports removed (bits corresponding to the member ports are cleared).

If a port is part of a global link aggregation group, a filter is applied to ensure that frames received at this

port are not bridged back to any of the ports in the global link aggregation group of which the source port

is part (ANA_AC:SRC[15-22]:SRC_CFG).

Local device ports part of a global link aggregation group must be cleared in the global aggregation

source mask (via ANA_AC:SRC[15-22]:SRC_CFG).

Source port filtering can be disabled when VCAP IS2 action MASK_MODE is set to 4 (= REDIR_PGID).

Source port filtering is not applied when a frame is routed.

3.23.1.3 Aggregation Group Port Selection

This section describes how to configure the aggregation table. The following table lists the applicable

registers.

The purpose of the aggregation table is to ensure that when a frame is destined for an aggregation

group, it is forwarded to exactly one of the group’s member ports.

The aggregation code REQ.AGGR_CODE generated in the classifier is used to look up an aggregation

mask in the aggregation table. Aggregation mask is configured in ANA_AC:AGGR:AGGR_CFG.

For non-aggregated ports, there is a one-to-one correspondence between logical port (ANA_CL:PORT:

PORT_ID_CFG.LPORT_NUM) and physical port, and the aggregation table does not change the

forwarding decision.

For aggregated ports, all physical ports in the aggregation group map to the same logical port, and

destination entries for a logical port in the PGID table must include all physical ports, which are members

of the aggregation group. Therefore, all but one LAG member port must be removed from the destination

port set.

For more information about link aggregation, see Link Aggregation Code Generation, page 113

3.23.1.4 Global Link Aggregation Forwarding

This section describes how to configure forwarding to a GLAG. The following table lists the applicable

registers.

Table 118 •

Source Table Registers Overview

Target::Register.Field

Description

Replication

ANA_AC:SRC:SRC_CFG

Configures source port filtering

Table 119 •

Aggregation Table Registers Overview

Target::Register.Field

Description

Replication

ANA_AC:AGGR:AGGR_CFG

Configures aggregation port filtering.

Table 120 •

GLAG Forward Registers Overview

Target::Register.Field

Description

Replication

ANA_AC::COMMON_VSTAX_CFG Configures VSTAX handles.

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