VSC7440 datasheet(200/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

183

After a limit is reached, both automatic learning and CPU-based learning of unlocked entries are denied.

A learn frame to be learned when the limit is reached can selectively be discarded, redirected to CPU, or

copied to CPU (controlled by ANA_L2:LRN_LIMIT:FID_LIMIT_CTRL.FID_LIMIT_EXCEED_SEL).

Attempts to exceed the configured limit can also trigger interrupt

(ANA_L2:LRN_LIMIT:FID_LIMIT_CTRL.FID_LIMIT_EXCEED_IRQ_ENA).

When the learn limits are exceeded, a corresponding sticky bit is set

(ANA_L2:LRN_LIMIT:FID_LIMIT_STATUS.FID_LRN_LIMIT_EXCEEDED_STICKY).

3.22.6.5 Shared or Independent VLAN Learning in MAC Table

The device can be set up to do a mix of Independent VLAN Learning (IVL), where MAC addresses are

learned separately on each VLAN and Shared VLAN Learning (SVL), where a MAC table entry is shared

among a group of VLANs. For shared VLAN learning, a MAC address and a filtering identifier (FID)

define each MAC table entry. A set of VIDs used for Shared VLAN learning maps to the same FID.

Shared VLAN learning is only applicable for unicast traffic.

Addresses learned from frames with one VLAN Identifier (VID) may or may not be used to filter frames

with the same SMAC but another VID, depending on management controls. If learned information is

shared for two or more given VIDs those VIDs map to a single Filtering Identifier (FID) and the term

Shared VLAN Learning (SVL) is used to describe their relationship. If the information is not shared, the

VIDs map to different FIDs and Independent VLAN Learning (IVL) is being used. FID is configured per

VLAN (ANA_L3:VLAN:VLAN_CFG.VLAN_FID).

For example, if VID 16 and VID 17 use SVL and share FID 16, then a MAC entry (MAC #X, FID 16) is

known for both VID 16 and VID 17.

If VID 16 and VID 17 use IVL and use FID 16 and FID 17, a MAC entry (MAC #X, FID 16) is only known

for VID 16; that is, the MAC address will be unknown for VID 17 (FID = 17).

In a VLAN-unaware operation, the device is set up to do SVL; that is, MAC addresses are learned for all

VLANs. Protocol-based VLAN, where traffic is classified into multiple VLANs based on protocol, requires

SVL

3.22.7

Automated Aging (AUTOAGE)

This section describes how to configure automated age scanning. The following table lists the applicable

registers.

Table 115 •

Automated Age Scan Registers Overview

Target::Register.Field

Description

Replication

LRN::AUTOAGE_CFG

Configures automated age scan of MAC table for

each of the four AGE_INTERVALs.

LRN::AUTOAGE_CFG_1

Configures automated age scan of MAC table.

LRN::AUTOAGE_CFG_2

Configures automated age scan of MAC table.

LRN::EVENT_STICKY.

AUTOAGE_SCAN_COMPLETED_STICKY

Signals completion of an automatic scan.

LRN::EVENT_STICKY.

AUTOAGE_SCAN_STARTED_STICKY

Signals start of an automatic scan.

LRN::EVENT_STICKY. AUTOAGE_AGED_STICKY Signals entries aged due to automatic aging.

LRN::EVENT_STICKY.

AUTOAGE_REMOVE_STICKY

Signals entries removed due to automatic aging. 1

ANA_L2::FILTER_LOCAL_CTRL

Configures front port filters to be used by

automatic aging and CPU scan.

ANA_L2::FILTER_OTHER_CTRL

Configures remote scan filter to be used by

automatic aging and CPU scan.

ANA_L2::LRN_CFG.AGE_SIZE

Configures the AGE_FLAG size.

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