VSC7440 datasheet(120/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

103

3.16

Analyzer Classifier

The analyzer classifier (ANA_CL) handles frame classification. This section provides information about

the following tasks performed by ANA_CL.

•

Basic classification. Initial classification including frame filtering, VLAN and QoS classification.

•

VCAP CLM processing. Advanced TCAM classification.

•

QoS mappings. Mapping and translations of incoming QoS parameters.

3.16.1

Basic Classifier

The analyzer classifier includes a common basic classifier that determines the following basic properties

that affect the forwarding of each frame through the switch.

•

VLAN tag extraction. Parses the frame’s VLAN tags in accordance with known tag protocol identifier

values.

•

Pipeline point evaluation. For injected and looped frames, ensures ANA_CL is part of the frame’s

processing flow.

•

Routing control. Evaluates if a frame can be routed in terms of VLAN tags.

•

Frame acceptance filtering. Drops illegal frame types.

•

QoS classification. Assigns one of eight QoS classes to the frame.

•

Drop precedence (DP) classification. Assigns one of four drop precedence levels to the frame.

•

DSCP classification. Assigns one of 64 DSCP values to the frame.

•

VLAN classification. Extracts tag information from the frame or use the port VLAN.

•

Link aggregation code generation. Generates the link aggregation code.

NXT_IDX_CTRL

Controls the generation of the G_IDX used in the VCAP CLM

next lookup:

0: TRANSPARENT. G_IDX of previous parser step is carried

forward to next parser step.

1: REPLACE. Replace previous G_IDX value with NXT_IDX of

this result.

2: ADD. Add NXT_IDX of this result to G_IDX of previous parser

step.

3: ISDX.Use ISDX as G_IDX.

4: RPL_COND_ISDX. Replace previous G_IDX value with

NXT_IDX of this result. Assign ISDX to ISDX_VAL for terminated

data.

5: Use ISDX with NXT_IDX for non terminated data (not CPU

redir and MEP traffic).

6: Replace ISDX with NXT_IDX. Use ISDX as G_IDX in next key

for non terminated data.

7: Reserved.

xxxx

NXT_IDX

Index used as part of key (field G_IDX) in the next lookup.

xxxx

RESERVED

Must be set to 0.

x x

PIPELINE_ACT_SEL

Used by PIPELINE_FORCE_ENA to control PIPELINE_ACT, see

PIPELINE_FORCE_ENA.

x x

LPORT_ENA

Controls if LPORT_NUM updates LPORT and IFH.SRC_PORT.

Table 65 •

VCAP CLM Actions (continued)

Field Name

Description and Encoding

Size

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