VSC7511 datasheet(92/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

Each lookup returns an action vector if there is a match. The potentially three IS1 action vectors are

applied in three steps. First, the action vector from the first lookup is applied, then the action vector from

the second lookup is applied to the result from the first action vector, and finally, the action vector from

the third lookup is applied to the result from the second action vector. This implies that if two or more

lookups return an action of DP_ENA = 1; for example, the DP_VAL from the last lookup is used.

The CUSTOM_ACE_TYPE_ENA action in IS1 enables the use of custom keys in IS2. Two different

custom keys are supported:

•

CUSTOM_IP: 40 bytes are extracted from the frame starting from byte-position 34. This position

corresponds to the first byte after the IPv4 header if the frame is IPv4. The 40 bytes are matched

against the CUSTOM entries in IS2.

•

CUSTOM_SMAC: 40 bytes are extracted from the frame starting from byte-position 12. This position

corresponds to the first byte after the source MAC address. The 40 bytes are matched against the

CUSTOM entries in IS2.

Note Up to two VLAN tags (two for double VLAN tagged frames and one for single VLAN tagged

frames) are removed from the frame before extracting the data.

VID_REPLACE_ENA

Controls the classified VID: VID_REPLACE_ENA=0:

Add VID_ADD_VAL to basic classified VID and use

result as new classified VID.

VID_REPLACE_ENA = 1: Replace basic classified VID

with VID_VAL value and use as new classified VID.

VID_ADD_VAL

See VID_REPLACE_ENA.

FID_SEL

Controls the Filter Identifier (FID) used when looking up

the MAC table.

0: Disabled: FID = classified VID prepended 0.

1: Use FID_VAL for SMAC lookup in MAC table.

2: Use FID_VAL for DMAC lookup in MAC table.

3: Use FID_VAL for DMAC and SMAC lookup in MAC

table.

FID_VAL

See FID_SEL.

PCP_DEI_ENA

If set, use PCP_VAL and DEI_VAL as classified PCP

and DEI values. Otherwise, PCP and DEI from basic

classification are used.

PCP_VAL

See PCP_DEI_ENA.

DEI_VAL

See PCP_DEI_ENA.

VLAN_POP_CNT_ENA

If set, use VLAN_POP_CNT as the number of VLAN

tags to pop from the incoming frame. This number is

used by the Rewriter. Otherwise, VLAN_POP_CNT from

ANA:PORT:VLAN_CFG.VLAN_POP_CNT is used.

VLAN_POP_CNT

See VLAN_POP_CNT_ENA.

CUSTOM_ACE_TYPE_ENA 76

Enables use of custom keys in IS2. Bits 3:2 control

second lookup in IS2 while bits 1:0 control first lookup.

Encoding per lookup:

0: Disabled.

1: Extract 40 bytes after position corresponding to the

location of the IPv4 header and use as key.

2: Extract 40 bytes after SMAC and use as key.

HIT_STICKY

If set, a frame has matched against the associated entry.

Table 45 •

IS1 Action Fields (continued)

Action Field

Bit

Width

Description

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