VSC7440 datasheet(109/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

3.15.7

VCAP CLM Actions

VCAP CLM supports four different actions, which can be used for different purposes. The actions have

different sizes and must be paired with the keys as listed in the following table.

Any VCAP CLM action can be used with any of VCAP CLM keys. However, if the action’s type is larger

than the associated key’s type (for instance FULL action of type X4 with TRI_VID key of type X8), then

the entry row in the VCAP cannot be fully utilized.

The following table provides details for all VCAP CLM actions. When programming an action in VCAP

CLM, the associated action fields listed must be programmed in the listed order with the first field in the

table starting at bit 0 in the action.

L4_RNG

Range mask. Range types: SPORT, DPORT, SPORT or DPORT, VID,

DSCP, custom.

Input into range checkers is taken from frame, except DSCP value, which

is the remapped DSCP value from basic classification.

CUSTOM1

64 bytes payload starting from current frame pointer position, as controlled

by VCAP CLM actions.

Note that if frame_type==ETH, payload is retrieved from a position

following the Ethernet layer. For example, after DMAC, SMAC, 0-3 VLAN

tags, and EtherType.

512

Table 64 •

VCAP CLM Action Selection

Action Name

Size

Action Type

MLBS_REDUCED

1 word

69 bits

X1 type

CLASSIFICATION

2 words

124 bits

X2 type

MLBS

2 words

127 bits

X2 type

FULL

4 words

250 bits

X4 type

Table 65 •

VCAP CLM Actions

Field Name

Description and Encoding

Size

X2_TYPE

X2 type.

0: MLBS.

1: Classification.

Table 63 •

VCAP CLM X16 Key Details (continued)

Field Name

Description

Size

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