VSC7440 datasheet(146/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

129

3.17.2.1 VLAN Table Update Engine

The VLAN Table Update Engine (TUPE) can be used to quickly update a large number of port masks in

the VLAN Table. For example, to support fast fail-over in scenarios with redundant forwarding paths. The

following table lists the TUPE related parameters that are outside the VLAN Table.

The TUPE_CTRL field in the VLAN table can be used to classify VLANs into different groups, and the

VLAN_PORT_MASK for such groups of VLANs are quickly updated using TUPE. Using the parameters

listed, the TUPE_CTRL field in the VLAN table can be processed as a field of individual bits, a field with

one value, or a combination of the two.

For example, if a command for TUPE uses the following, the TUPE_CTRL field is treated as an 8-bit

value field and eight individual bits.

•

TUPE_CTRL_BIT_ENA = 1

•

TUPE_CTRL_BIT_MASK = 0x00ff

•

TUPE_CTRL_VAL_MASK = 0xff00

In order for TUPE to update a VLAN entry’s VLAN_PORT_MASK, the value part of TUPE_CTRL must

match the required value, and one or more bits of the bit part of TUPE_CTRL must be set.

If all bits in TUPE_CTRL are used as a value field, then a total of 216 groups can be created, but each

VLAN can only be member of one such group.

On the other end of the spectrum, if all bits in TUPE_CTRL are treated as individual bits, then only 16

groups can be created, but every VLAN can be member of any number of these groups.

In configurations that have fewer physical ports than the number of bits in the VLAN_PORT_MASK, such

bits can be used as an extension to the bit part of the TUPE_CTRL field.

Apart from the VLAN’s TUPE_CTRL, the value of the VLAN’s VLAN_PORT_MASK is also used to

decide whether to update a given VLAN table entry.

Table 81 •

VLAN Table Update Engine (TUPE) Parameters

Bits

Description

TUPE_MISC.TUPE_START

Start TUPE.

TUPE_MISC.TUPE_CTRL_VAL_ENA 1

Enable use of TUPE_CTRL_VAL and TUPE_CTRL_VAL_MASK.

TUPE_CTRL_BIT_ENA

Enable use of TUPE_CTRL_BIT_MASK.

TUPE_PORT_MASK_A_ENA

Enable use of TUPE_PORT_MASK_A.

TUPE_PORT_MASK_B_ENA

Enable use of TUPE_PORT_MASK_B

TUPE_COMB_MASK_ENA

Enable combined use of TUPE_CTRL_BIT_MASK and

TUPE_PORT_MASK_A.

TUPE_ADDR.TUPE_START_ADDR

First address in VLAN table for TUPE to process.

TUPE_ADDR.TUPE_END_ADDR

Last address in VLAN table for TUPE to process.

TUPE_CMD_PORT_MASK_CLR

TUPE_CMD_PORT_MASK_CLR1

TUPE command: Port mask bits to clear.

TUPE_CMD_PORT_MASK_SET

TUPE_CMD_PORT_MASK_SET1

TUPE command: Port mask bits to set.

TUPE_CTRL_VAL