VSC7440 datasheet(281/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

264

3.26.7.4 Constructing VLAN Tags

The contents of the tag header are highly programmable when pushing a VLAN tag. The following

illustration shows the VLAN tag construction.

Figure 81 •

VLAN Tag Construction

The port tags (ES0.PUSH_OUTER_TAG = [0[2]), the ES0 tags A to C, and the special tags have

individual configurations.

Port Tag: PCP

Use REW:PORT:TAG_CTRL.TAG_PCP_CFG to configure the following:

•

Use the classified PCP.

•

Use the egress port’s port VLAN (PORT_VLAN_CFG.PORT_PCP).

•

Use the QoS class directly.

•

Map DE and QoS class to a new PCP value using the per-port table PCP_MAP_DEx.

•

Map DE and COSID to a new PCP value using the per-port table PCP_MAP_DEx.

•

Map DE and classified PCP to a new PCP value using the per-port table PCP_MAP_DEx.

•

Use the COSID class directly.

Port Tag: DEI

Use REW:PORT_TAG_CTRL.TAG_DEI_CFG to configure the following:

•

Use the classified DEI.

•

Use the egress port’s port VLAN (PORT_VLAN_CFG.PORT_DEI).

•

Use mapped DP to DE level (color).

PUSH_CUSTOMER_TAG = 3

Controls port

tag

3: Push tag C if UNTAG_VID_ENA = 0 or (C-TAG.VID

! = VID_C_VAL). C-TAG.VID is controlled by TAG_C_VID_SEL.

UNTAG_VID_ENA

Controls port

tag

See PUSH_CUSTOMER_TAG = 3.

Table 184 •

ES0 VLAN Tag Actions (continued)

ES0_ACTION

TAG_CFG

Tagging Action

TPID

PCP

VID

Mapped using ES0(2)

PCP of popped tag(2)

Classified

Fixed

COSID

1. Classified using IFH 0x8100, 0x88A8,

or 3xCustom.

2. ES0 tag A to C.

3. For port tag, this is classified only.

Classified + fixed(3)

Routing (VMID)

Fixed

QoS class

Mapped DE, QoS

Mapped DE, COSID

Mapped DE, PCP

Mapped using ES0(2)

DEI of popped tag(2)

Classified

Fixed

Color (DE)

Mapped DE, QoS

Mapped DE, COSID

Mapped DE, PCP

0x8100

0x88A8

3xCustom

Classified(1)

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