VSC7511 datasheet(120/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

105

3.9.1.4

Known Multicasts

From a CPU, entries can be added to the MAC table with any content. This makes it possible to add a

known multicast address with multiple destination ports:

•

Set the MAC and VID in MACHDATA and MACLDATA.

•

Set MACACCESS.ENTRY_TYPE = 1, because this is not an entry subject to aging.

•

Set MACACCESS.AGED_FLAG to 0.

•

Set MACACCESS.DEST_IDX to an unused value.

•

Set the destination mask in the destination mask table pointed to by DEST_IDX to the desired ports.

Example All frames in VLAN 12 with MAC address 0x010000112233 are to be forwarded to ports 8, 9,

and 12.

This is done by inserting the following entry in the MAC table:

VID = 12

MAC = 0x010000112233

ENTRY_TYPE = 1

VALID = 1

AGED_FLAG = 0

DEST_IDX = 40

and configuring the destination mask table PGID[40] = 0x1300.

IPv4 and IPv6 multicast entries can be programmed differently without using the destination mask table.

This is described in the following subsection.

3.9.1.5

IPv4 Multicast Entries

MAC table entries with the ENTRY_TYPE = 2 settings are interpreted as IPv4 multicast entries.

IPv4 multicasts entries match IPv4 frames, which are classified to the specified VID, and which have

DMAC = 0x01005Exxxxxx, where xxxxxx is the lower 24 bits of the MAC address in the entry.

Instead of a lookup in the destination mask table (PGID), the destination set is programmed as part of the

entry MAC address. This is shown in the following table.

Example: All IPv4 multicast frames in VLAN 12 with MAC 01005E112233 are to be forwarded to ports 3,

8, and 9. This is done by inserting the following entry in the MAC table entry:

VALID = 1

VID = 12

MAC = 0x000308112233

ENTRY_TYPE = 2

DEST_IDX = 0

3.9.1.6

IPv6 Multicast Entries

MAC table entries with the ENTRY_TYPE = 3 settings are interpreted as IPv6 multicast entries. IPv6

multicasts entries match IPv6 frames, which are classified to the specified VID, and which have

DMAC=0x3333xxxxxxxx, where xxxxxxxx is the lower 32 bits of the MAC address in the entry.

Instead of a lookup in the destination mask table (PGID), the destination set is programmed as part of the

entry MAC address. This is shown in the following table.

Table 76 •

IPv4 Multicast Destination Mask

Destination Ports

Record Bit Field

Ports 10-0

MAC[34-24]

Table 77 •

IPv6 Multicast Destination Mask

Destination Ports

Record Bit Field

Ports 10 through 0

MAC [42-32]

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