VSC7511 datasheet(117/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

102

The analyzer contains a MAC table with 4096 entries containing information about stations learned by

the device. The table is organized as a hash table with four buckets and 1024 rows. Each row is indexed

by an 10-bit hash value, which is calculated based on the station’s (MAC, VID) pair, as shown in the

following illustration.

Figure 33 •

MAC Table Organization

The following table lists the fields for each entry in the MAC table.

MACTINDX

Direct address into the MAC table for direct read and write.

None

MACACCESS

Flags and command when accessing the MAC table.

None

MACTOPTIONS

Flags when accessing the MAC table.

None

AUTOAGE

Age scan period.

None

AGENCTRL

Controls the default values for new entries in MAC table.

None

ENTRYLIM

Controls limits on number of learned entries per port.

Per port

LEARNDISC

Counts the number of MAC table entries not learned due lack

of storage in the MAC table.

None

Table 74 •

MAC Table Entry

Field

Bits

Description

VALID

Entry is valid.

MAC

The MAC address of the station (primary key).

VID

VLAN identifier that the station is learned with (primary key).

DEST_IDX

Destination mask index pointing to a destination mask in the destination

mask table (PGID entries 0 through 63).

Table 73 •

MAC Table Access (continued)

Description

Replication

bucket 0

bucket 1

bucket 2

bucket 3

Index 0

MAC/VID

Hash Key Value

Index 1

Index XXX

Index 1023

bucket 0

bucket 1

bucket 2

bucket 3

bucket 0

bucket 1

bucket 2

bucket 3

bucket 0

bucket 1

bucket 2

bucket 3

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