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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

184

Entry AGE_FLAG is used to detect inactive sources. The AGE_FLAG field is cleared upon receiving

traffic from a given source station and is periodically incremented by hardware to detect and delete

inactive source entries.

The automated age scan scans the MAC table and checks age candidates (entries with LOCK flag set to

0) for activity.

If an entry’s AGE_FLAG is set to maximum value (configured in ANA_L2::LRN_CFG.AGE_SIZE), the

entry is deemed inactive and removed. If an entry’s AGE_FLAG is less than the maximum value, the

AGE_FLAG is incremented.

The flag is cleared when receiving frames from the station identified by the MAC table entry.

It is possible to configure and forget AUTOAGE, which means that once configured automated aging is

performed without any further CPU assistance.

The interval between automatic aging can be controlled by specifying AGE_FLAG size

(ANA_L2::LRN_CFG.AGE_SIZE), unit size (LRN::AUTOAGE_CFG.UNIT_SIZE), and the number of units

between aging (LRN::AUTOAGE_CFG.PERIOD_VAL).

Setting LRN::AUTOAGE_CFG.UNIT_SIZE different from 0 to start the automatic aging.

To temporarily disable automatic aging, set LRN::AUTOAGE_CFG. PAUSE_AUTO_AGE_ENA to 1.

Additional control of automatic aging allows for instantaneously start and stop of current age scan

(LRN::AUTOAGE_CFG_1.FORCE_HW_SCAN_SHOT and

LRN::AUTOAGE_CFG_1.FORCE_HW_SCAN_STOP_SHOT).

It is also possible to do a controlled stopping of current age scan after it completes

(LRN::AUTOAGE_CFG_1.FORCE_IDLE_ENA).

It is possible to selectively do age filtering of local ports specified in

ANA_L2::FILTER_LOCAL_CTRL.FILTER_FRONTPORT_ENA or selectively do age filtering of entries

learned on remote devices in a multichip configuration

(ANA_L2::FILTER_OTHER_CTRL.FILTER_REMOTE_ENA). Both types must be enabled

(LRN::AUTOAGE_CFG_1.USE_PORT_FILTER_ENA).

The state of automatic aging can be monitored (LRN::AUTOAGE_CFG_2.NEXT_ROW,

LRN::AUTOAGE_CFG_2.SCAN_ONGOING_STATUS,

LRN::EVENT_STICKY.AUTOAGE_SCAN_COMPLETED_STICKY and

LRN::EVENT_STICKY.AUTOAGE_SCAN_STARTED_STICKY).

It is possible to observe whether entries are affected by a sticky event

(LRN::EVENT_STICKY.AUTOAGE_AGED_STICKY and

LRN::EVENT_STICKY.AUTOAGE_REMOVE_STICKY).

Example

For a 300-second age time, set four age periods of 75 seconds each:

Set ANA_L2::LRN_CFG.AGE_SIZE to 1.

Set LRN::AUTOAGE_CFG[0]. AUTOAGE_UNIT_SIZE to 3.

Set LRN::AUTOAGE_CFG[0]. AUTOAGE_PERIOD_VAL to 75.

3.22.8

Interrupt Handling

The following table lists the interrupt handling registers.

Table 116 •

Analyzer Interrupt Handling Registers Overview

Target::Register.Field

Description

Replication

ANA_L2::INTR

Status of interrupt source

ANA_L2::INTR_ENA

Mask interrupt

ANA_L2::INTR_IDENT

Status of interrupt

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