VSC7440 datasheet(277/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

260

•

DEI in 802.3 VLAN tags

•

PCP in 802.3 VLAN tags

The following table lists the configuration registers associated with the mapping tables.

Each of the two resources provide all of the fields listed above. Two lookups are done in each resource

for every frame. This generates four mapping results per frame.

The four lookups implement mapping table 0 to 3. The address used for each lookup is controlled by the

ES0 actions MAP_n_KEY and MAP_n_IDX (n =0:3).

A mapping table address consists of two parts:

•

A base index: ES0.MAP_n_IDX. This controls the MSB part of the table address.

•

One of 15 different keys that use classified frame properties to generate the LSB of the table

address. For more information about each key, see ES0 Configuration Registers, page 247.

The following illustration depicts the mapping table functionality.

Figure 79 •

Mapping Tables

The mapping tables provide a flexible way to update frame fields. The following example shows how to

configure and use mapping table 1.

Update PCP in VLAN tag A using mapping table 1. Use frame DSCP as index:

•

Enable ES0

Table 182 •

Mapping Table Configuration Registers

Description

Replication

MAP_RES_x (x= A or B)

MAP_VAL_x:TC_VAL

Mapped TC value

2,048 × 2

MAP_VAL_x:DSCP_VAL

Mapped DSCP value

2,048 × 2

MAP_VAL_x:DEI_VAL

Mapped DEI value

2,048 × 2

MAP_VAL_x:PCP_VAL

Mapped PCP value

2,048 × 2

MAP_VAL_x:OAM_COLOR

Mapped OAM Color

2,048 × 2

MAP_VAL_x:OAM_COSID

Mapped OAM Cosid

2,048 × 2

MAP_LBL_x:LBL_VAL

Mapped MPLS label value

2,048 × 2

VCAP

ES0

Table selector actions

for each field

1 to 3 MPLS labels

Pushed Q-Tags

OAM

PDU-MOD

Egress

IP Frame

ES0 Key

Classified

fields

Frame from OQS

Resource

Table 0 fields

Table 1 fields

Table 2 fields

Table 3 fields

LABEL

TTL

IFH

Frame

TPID

PCP

VID

DSCP

OAM

Path Info

ES0.map_key(0,1)

ES0.map_key(2,3)

ES0.map_idx(2,3)

ES0.map_idx(0,1)

Innermost TCI

SOC

Addr

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