KSZ9567R datasheet(33/232 Pages) MICROCHIP

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DS00002329D-page 33

KSZ9567R

Note 4-1

VLAN Enable is bit 7 in the Switch Lookup Engine Control 0 Register

Note 4-2

VLAN Match/Valid indicates when the VLAN Table entry is valid

Note 4-3

Forward Option is a bit in the VLAN Table Entry 0 Register

Note 4-4

Egress VLAN Filtering are bits 5 and 4 in the Switch Lookup Engine Control 2 Register

Note 4-5

Unknown VID Forwarding is in the Unknown VLAN ID Control Register

Note 4-6

Drop Invalid VID is bit 6 in the Switch Lookup Engine Control 0 Register

Note 4-7

ALU Match/Valid indicates when the Address Lookup is a success

Table 4-9 describes in more detail the address lookup process that follows the VLAN Table lookup. Lookup occurs in

both the Address Lookup Table and the Static Address Table simultaneously, and the resulting action depends on the

results of the two lookups.

A source address (SA) lookup is also performed in the Address Lookup Table. SA lookup also performs SA filtering and

MAC priority when the address is hit. Table 4-10 describes how learning is performed in the Address Lookup Table when

a successful VLAN table lookup has been done and the no matching static entry is found in the Address Lookup Table

or the Static Address Table.

Note:

“(def)” indicates the default power-up value.

TABLE 4-9:

HASHED(DA) + FID LOOKUP IN VLAN MODE

DA found in

Static MAC

Table?

Use FID Flag?

(Static MAC Table)

FID Match?

DA+FID found in

ALU Table?

Action

Don’t Care

Lookup has failed. Broadcast to

the membership ports defined in

the VLAN Table

Don’t Care

Yes

Send to the destination port

defined in the Address Lookup

(ALU) Table

Yes

Don’t Care

Send to the destination port(s)

defined in the Static Address Table

Yes

Lookup has failed. Broadcast to

the membership ports defined in

the VLAN Table.

Yes

Send to the destination port

defined in the Address Lookup

(ALU) Table

Yes

Don’t Care

Send to the destination port(s)

defined in the Static Address Table

TABLE 4-10:

HASHED(SA) + FID LOOKUP IN VLAN MODE

FID + SA found in Address Lookup (ALU) Table?

Action

Learn and add FID + SA to the Address Lookup (ALU) Table

Yes

If the static bit is 0, the time stamp and the egress port map

are updated. If the static bit is 1, then nothing is done.

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