VSC7440 datasheet(142/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

125

The following table shows the configuration parameters (located within the ANA_L3 configuration target)

for each entry in the VLAN table.

The following table shows the configuration parameters for each entry in the MSTP table.

The following table lists common parameters that also affect the VLAN and MSTP processing of frames.

If VLAN support is enabled (in VLAN_CTRL.VLAN_ENA), the classified VID is used to lookup the VLAN

information in the VLAN table. The VLAN table in turn provides an address (VLAN_MSTP_PTR) into the

MSTP table. Learn, mirror, and forwarding results are calculated by combining information from the

VLAN and MSTP tables.

Table 78 •

VLAN Table (4224 Entries)

Field in ANA_L3:VLAN

Bits

Description

VMID

VMID, identifying VLAN’s router leg.

VLAN_MSTP_PTR

Pointer to STP instance associated with VLAN.

VLAN_FID

FID to use for learning and forwarding.

VLAN_IGR_FILTER_ENA 1

Enable VLAN ingress filtering.

VLAN_SEC_FWD_ENA

Enables secure forwarding on a per VLAN basis.

When secure forwarding is enabled, only frames with known SMAC are forwarded.

VLAN_FLOOD_DIS

Disables flooding of frames with unknown DMAC on a per VLAN basis.

VLAN_LRN_DIS

Disables learning of SMAC of frames received on this VLAN.

VLAN_RLEG_ENA

Enables router leg in VLAN.

VLAN_PRIVATE_ENA

Enables/disables this VLAN as a Private VLAN (PVLAN).

VLAN_MIRROR_ENA

VLAN mirror enable flag. If this field is set, frames classified to this ingress VLAN

are mirrored.

Note that a mirroring probe must also be configured to enable VLAN based

mirroring. see Mirroring, page 206.

VLAN_PORT_MASK

VLAN_PORT_MASK1

Specifies mask of ports belonging to VLAN.

TUPE_CTRL

Controls value for Table Update Engine (TUPE).

Table 79 •

MSTP Table (66 Entries)

Field in ANA_L3:MSTP

Bits

Description

MSTP_FWD_MASK

1 per port

Enables/disables forwarding per port

MSTP_LRN_MASK

1 per port

Enables/disables learning per port

Table 80 •

Common VLAN and MSTP Parameters

Bits

Description

VLAN_CTRL.VLAN_ENA

Enables/disables VLAN lookup

PORT_FWD_CTRL

1 per port

Configures forwarding state per port

PORT_LRN_CTRL

1 per port

Configures learning state per port

VLAN_FILTER_CTRL

1 per port

Configures VLAN ingress filtering per port

VLAN_ISOLATED_CFG

1 per port

Configures isolated port mask

VLAN_COMMUNITY_CFG

1 per port

Configures community port mask

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