VSC7440 datasheet(317/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

300

After the VLAN TUPE command is completed, the VLAN table is updated as shown in the following table.

The TUPE_CTRL field is 16 bits wide, so using the described approach allows up 16 Ethernet rings with

VLAN TUPE assisted protection switching. However, any unused bits in the 11-bit wide

VLAN_PORT_MASK can be used in the same manner as TUPE_CTRL bits.

For Ethernet rings using only a few VIDs, there is little to gain in using VLAN TUPE and new values could

instead be written directly to the VLAN_PORT_MASK of the relevant VIDs.

In addition to running the VLAN TUPE commands listed in the previous table, any MAC addresses

learned on the ring ports of ring 2 must be flushed from the MAC table. In the above example, ring 2 uses

32 VIDs for forwarding traffic. Each of these use a specific FID. In this example, FID is set equal to VID.

MAC addresses for up to 16 FIDs can be flushed at a time, so to flush MAC addresses for 32 FIDs, two

flush commands must be executed. The first flush command is shown in the following table. The second

flush command is identical, except SCAN_FID_VAL is set to 26-30, 40-50.

Flushing MAC addresses from the MAC table usually takes longer than running VLAN TUPE. As a result,

to have the protection switching complete as fast as possible, start MAC table flushing first, followed by

VLAN TUPE. The two will then run in parallel, and when both have completed, the protection switching is

done.

Table 226 •

VLAN Table Configuration After APS

Addr (VID)

TUPE_CTRL

VLAN_PORT_MASK

VLAN_FID

4-9

0x01

0x0003

4-9

10-19

0x03

0x0183

10-19

31-32

0x01

0x0003

31-32

20-30, 40-50

0x02

0x0180

20-30, 40-50

Table 227 •

MAC Table Flush, First Command

Field

Value

Comment

ANA_L2::SCAN_FID_CTRL.SCAN_FID_ENA

Enables use of SCAN_FID_VAL.

ANA_L2::SCAN_FID_CFG.SCAN_FID_VAL

10-25

Flushes FIDs 10-25.

Flushing can be done for up to 16 discrete FID

values at a time.

If flushing needs to be done for less than 16 FIDs.

the unused FID values must be set to 0x1FFFF.

LRN::SCAN_NEXT_CFG.FID_FILTER_ENA

Enables FID specific flushing.

LRN::MAC_ACCESS_CFG_0.MAC_ENTRY_FID

0x1FFFF 0x1FFFF => not used.

LRN::AUTOAGE_CFG_1.USE_PORT_FILTER_ENA

Enables flushing for specific ports.

ANA_L2::FILTER_LOCAL_CTRL

0x0180

Flushes port 7 and 8.

LRN::SCAN_NEXT_CFG.SCAN_NEXT_REMOVE_F

OUND_ENA

Removes matches. In other words flushing.

LRN::COMMON_ACCESS_CTRL.MAC_TABLE_ACC

ESS_SHOT

Start flushing.

The device clears

MAC_TABLE_ACCESS_SHOT when flushing

has completed.

If desirable the device can be configured to

generate an interrupt when flushing has

completed. This can be used to trigger any

subsequent flush commands.

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